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Persistent Toxic Chemicals in the U.S. Food Supply
March 2001
Pesticide Action Network North America
Commonweal
Authors
Kristin S. Schafer, Pesticide Action Network
Susan E. Kegley, Pesticide Action Network
Sharyle Patton, Commonweal
Pesticide Action Network
Founded in 1982, Pesticide Action Network is an international coalition of more than 400 citizens groups
in more than 60 countries working to oppose the misuse of pesticides and to promote sustainable and eco-
logically sound pest management.
49 Powell Street, Suite 500
San Francisco, CA 94102
Tel: (415) 981-1771
Fax: (415) 981-1991
Email: panna@panna.org
Website: www.panna.org
Commonweal
Commonweal, founded in 1976, is a nonprofit health and environmental research
institute. Commonweal has three primary areas of program interest: children, health and the
environment. In these three interest areas, we initiate or collaborate in service, research, demonstration,
policy and educational projects. Commonweal also operates a retreat center that is available for group and
individual retreats when not in use for Commonweal programs.
P.O. Box 316
Bolinas, CA 94924
Tel: (415) 868-0970
Second Edition
Copyright 2001 by Pesticide Action Network North America Regional Center. Permission is granted to reproduce portions of this report, provided
the title and publishing organizations, Pesticide Action Network North America Regional Center and Commonweal, are acknowledged.
Printed on recycled paper.
Acknowledgments
This report was developed as part of an effort by a number of U.S. nonprofit organizations concerned
about environmental health to bring public attention to the dangers posed by persistent toxic chemicals.
This “StopPOPs” effort shaped and informed the development of this report, and we thank all of the partic-
ipating organizations for their input and support.
Many individuals contributed to this report. Ted Schettler (Science and Environmental Health Network),
Charlotte Brody (Center for Environmental Health and Justice) and Monica Moore (Pesticide Action Net-
work) reviewed the report and provided important comments. Richard Wiles (Environmental Working
Group) and Charles Benbrook (Benbrook Consulting) assisted with ideas on food residue data analysis.
Katie Silberman (Center for Environmental Health), Kate Holcombe (Commonweal) and Aimee Kingery
(Pesticide Action Network) provided research support.
Pesticide Action Network’s work on persistent organic pollutants is made possible by grants from the Jen-
nifer Altman Foundation, the Homeland Foundation, the Mitchell Kapor Foundation and Joshua Mailman.
The views expressed in this report are those of the authors and do not necessarily reflect the views of our
funders. The authors alone bear responsibility for any factual errors.
TABLE OF CONTENTS
Acknowledgments............................................................................................................ 4
A Note to Readers............................................................................................................ 6
1. EXECUTIVE SUMMARY.............................................................................................. 7
2. INTRODUCTION: Persistent Toxic Chemicals,
the Food Supply and the Global POPs Treaty ........................................................ 9
The Global POPs Treaty
How POPs Enter the Food Supply
Overview of the Analysis: Scope, Methods and Data Sources
3. FINDINGS: Persistent Toxic Chemicals Pervade
the U.S. Food Supply .......................................................................................... 13
Overview of Findings
Top Ten Foods Most Contaminated with POPs
POPs Residues Contaminate Holiday Dinner and Daily Diets
FDA Action Levels Do Not Protect Public Health
PCBs in Food
Persistent Toxic Chemicals Are Linked to a Variety of Health Problems
4. CONCLUSION AND RECOMMENDATIONS .............................................................. 27
5. REFERENCES AND ONLINE RESOURCES.................................................................. 28
APPENDIX A: Long-Range Deposition of POPs
APPENDIX B: Health-Based Standards for POPs Exposure
APPENDIX C: POPs Residue Levels on Top Ten Contaminated Foods
APPENDIX D: POPs Residue Levels in Holiday Menu and Regional Diets
APPENDIX E: Dieldrin Levels in Regional Menus as a Percent of ATSDR’s MRL
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A Note to Readers
This report documents that persistent toxic chemicals are pervasive in the U.S. food supply. In the final
analysis, however, the report is not about U.S. food production or processing.
Today’s farmers and food processing companies, after all, are not to blame for the contamination docu-
mented in this report. Most of the persistent organic pollutants or “POPs” targeted for global elimination
under the recently negotiated international POPs treaty were banned in the United States years ago. Never-
theless, these POPs continue to make their way into the food supply from sources outside of U.S. agricul-
ture. In a very real sense, therefore, today’s farmers, food processing companies and the consumers they
service are largely victims of previous and continuing global production and use of these POPs.
The new global POPs treaty offers an unprecedented opportunity to eliminate production and use of some
of the most dangerous persistent toxic chemicals ever produced. The fact that the treaty is scheduled to be
signed in May 2001 in Stockholm, Sweden is cause for celebration indeed. However, the “Stockholm Con-
vention” will come into effect only after 50 countries have ratified it. So unless and until the treaty is rati-
fied and effectively implemented, these dangerous chemicals will continue to be produced, released into
the environment, and make their way into the diets of consumers here and abroad.
We urge leaders in U.S. agriculture and the food industry to join us in pressing the Bush Administration to
play a leadership role in supporting the rapid ratification and implementation of a strong POPs treaty that is
designed to protect the health of present and future generations.
Monica Moore
Program Director
Pesticide Action Network
San Francisco, CA
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EXECUTIVE SUMMARY
A class of toxic chemicals known as persistent
organic pollutants (POPs) are among the most dan-
gerous compounds ever produced. They include
industrial chemicals, byproducts of manufacturing
processes and waste incineration, and pesticides
that have been linked to devastating human health
consequences.
Despite their hazards, POPs continue to be pro-
duced, used and stored in many countries. Because
they are long-lasting and travel long distances in
global air and water currents, even POPs already
banned in the United States, such as DDT and
PCBs, still make their way into the U.S. food supply.
This report is being released following the interna-
tional community’s successful negotiation of a glo-
bal treaty in December 2000 to eliminate the
worldwide production and use of 12 of the worst
persistent toxic chemicals, including DDT, PCBs,
dieldrin and dioxins. The United Nations-spon-
sored accord reflects worldwide recognition that
stopping further POP contamination of any coun-
try’s food supply and environment can only be
accomplished through effective global coopera-
tion.
The purpose of the report is to construct the most
comprehensive picture possible of the prevalence
of persistent toxic chemicals in the U.S. commer-
cial food supply, given available federal govern-
ment and university data. The compounds
examined in the report are the 12 chemicals to be
eliminated under the global POPs treaty.
Findings of POPs in food products are presented
for a stereotypical U.S. Thanksgiving/Christmas
holiday meal as well as for hypothetical daily diets
in four geographic regions of the country: the
Southeast, the Northeast, the Midwest and the
West. Menus for breakfast, lunch, snack and dinner
are included in the daily diets for each region. The
POP contaminants and residue levels found in each
food item are listed. Data on POPs levels in food
items are drawn primarily from the year 2000 ver-
sion of the Food and Drug Administration’s annual
Total Diet Study and the latest annual pesticide res-
idue data on fruits and vegetables from the U.S.
Department of Agriculture’s Pesticide Data Pro-
gram.
Persistent Toxic Chemicals Pervade
the U.S. Food Supply
The evaluation of POPs residue data produced star-
tling results, including the following:
• Virtually all food products are contaminated
with POPs that have been banned in the United
States—baked goods, fruit, vegetables, meat,
poultry and dairy products.
• It is not unusual for daily diets to contain food
items contaminated with three to seven POPs.
• A hypothetical holiday dinner menu of 11 food
items can deliver 38 “hits” of POPs exposure
(where a hit is one persistent toxic chemical on
one food item).
• Hypothetical daily meal plans, for four U.S.
regions, can each deliver between 63 and 70
exposures to POPs per day. By region, the
number of exposures found were as follows:
• Northeast: 64 exposures per day
• Midwest: 63 exposures per day
• Southeast: 70 exposures per day
• West: 66 exposures per day
The top 10 POPs-contaminated food items, in
alphabetical order, are butter, cantaloupe, cucum-
bers/pickles, meatloaf, peanuts, popcorn, radishes,
spinach, summer squash and winter squash.
While POPs residue levels in individual food items
are small, when viewed in the context of daily
amounts of food consumption, the contamination
found is at or near levels of concern according to
health-based standards set by the Centers for Dis-
ease Control and Prevention’s Agency for Toxic
Substances and Disease Registry (ATSDR) and the
EPA.
The two most pervasive POPs in food are dieldrin
and DDE. Dieldrin is a highly persistent and toxic
organochlorine pesticide banned since the late
1970s. DDE is a breakdown product of DDT,
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which has been banned since 1972. Exposure to
these chemicals has been associated with breast
cancer, other types of cancer, immune system sup-
pression, nervous system disorders, reproductive
damage and disruption of hormonal systems.
Low Level POPs Exposure Associated
with Serious Health Effects
• Developing fetuses and children are especially
vulnerable to problems caused by exposure to
POPs. Recent scientific studies show that
exposure to miniscule levels of POPs at crucial
times in fetal and infant development can dis-
rupt or damage reproductive, neurological and
immune systems.
• Exposure to low levels of POPs has likely con-
tributed to disturbing public health trends,
including increased incidence of breast cancer,
learning disabilities and other neurodevelop-
mental problems, as well as reproductive prob-
lems.
• The Food and Drug Administration’s “action
levels” for determining whether contaminated
foods should be removed from the U.S. food
market do not protect American food consum-
ers from the health threats of POPs. In some
cases, consumption of a single food item con-
taminated at levels allowed by FDA would
expose the consumer to more than 50 times the
daily exposure levels considered “safe” by
other agencies.
Recommendations
This study shows the ubiquitous presence of per-
sistent toxic chemicals in the U.S. food supply,
despite the fact that most of the POPs pesticides
that have been used for food production have been
banned in this country for years.
From a health protection standpoint, the evidence
presented strongly indicates that American con-
sumers would be served best by implementing the
precautionary principle to prevent additional accu-
mulation of POPs in our air, water and soil. Given
the serious health risks associated with even
extremely small levels of exposure to POPs, pre-
venting further contamination of food must be a
national priority.
The recently negotiated POPs treaty includes refer-
ences to the precautionary approach, and offers a
vehicle for preventing further accumulation of per-
sistent toxic chemicals in U.S. food supplies.
Effective implementation of the treaty, including
the early addition of POPs chemicals not included
in the initial targeted list,will give future genera-
tions everywhere the chance to experience life free
from fear of harm from persistent toxic chemicals.
Rapid ratification and implementation of the treaty
should be an urgent priority for the current U.S.
Administration.
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INTRODUCTION: Persistent Toxic
Chemicals, the Food Supply and the Global
Pops Treaty
A class of toxic chemicals known as persistent
organic pollutants (POPs) are among the most dan-
gerous compounds ever produced. This ubiquitous
class of chemicals includes many pesticides, indus-
trial chemicals and byproducts of certain manufac-
turing processes and waste incineration. The
characteristics that make these chemicals unique
also make them an urgent global environmental
health problem:
• POPs persist in the environment;
• POPs build up in body fat and concentrate at
higher levels (bioaccumulate) as they make
their way up the food chain;
• POPs travel in global air and water currents;
and
• POPs are linked with serious health effects in
humans and other living organisms.
In just a few decades, POPs have spread through-
out the environment to threaten human health and
to damage land and water ecosystems all over the
world. All living organisms on Earth now carry
measurable levels of POPs in their tissues. POPs
have been found in sea mammals at levels high
enough to qualify their bodies as hazardous waste
under U.S. law (Cummins, JE 1988). Nor are
humans immune to contamination. Evidence of
POPs contamination in human blood and breast
milk has been documented worldwide (CHEJ
2000, Solomon 2000).
There is strong evidence that exposure to even
miniscule amounts of POPs at critical periods of
development—particularly in the womb—can
cause irreversible damage. The effects of such
exposures may take years to develop, sometimes
appearing first in the offspring of exposed parents.
Some of the human health effects now linked to
POPs exposure include cancer, learning disorders,
impaired immune function, reproductive problems
(e.g., low sperm counts, endometriosis) and diabe-
tes (Orris et al. 2000, Colburn et al. 1996).
Despite their hazards, these chemicals continue to
be produced, used and stored in many countries.
Even where national bans or other controls exist,
these restrictions are often poorly enforced—and in
any case, they cannot protect citizens from expo-
sure to POPs that have migrated from other regions
where the chemicals are still in use.
Because they are persistent and continue to be pro-
duced and released into the global environment,
even POPs already banned in the United States,
such as DDT and PCBs, make their way into the
U.S. food supply. Once in the air, the water and the
soil, these chemicals resist breaking down. Some
have half-lives measured in decades, and they
remain in water and soil as well as plants and ani-
mals that ultimately, in one form or another, pro-
vide food for humans. POPs that were once
particles in the sediment of a riverbed, in soil or in
grasses find their way into the fatty tissue and milk
of livestock or into the vegetables that pull POPs
from the soil in the same way they take in nutri-
ents.
It is no surprise, therefore, that POPs are pervasive
in store-bought food as well as in fish and wildlife
consumed after being caught in the wild. This pres-
ence of POPs in the food supply creates a compel-
ling and urgent need for action to prevent further
release and buildup of these dangerous chemicals.
The Global POPs Treaty
Recognizing that the health risks from POPs can
neither be managed by individual countries’ regu-
lators nor contained by national borders, the United
Nations Environment Programme sponsored an
international agreement to phase out production,
use and release of POPs. Twelve POPs have been
identified as initial phaseout targets under the new
treaty. This list includes nine organochlorine pesti-
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cides and three industrial chemicals/ byproducts
(see box). The global POPs treaty is a promising
vehicle for addressing POPs accumulation in the
U.S. food supply.
The nine pesticides on this initial list have been
banned or severely restricted in the United States
since the 1970s and 1980s. Most industrialized
countries and many developing countries also have
banned or restricted the use of these pesticides. It is
important to note that while other POPs pesticides
are present in the U.S. food supply, the focus of
this report is limited to the initial list of chemicals
targeted under the POPs treaty. The treaty includes
provisions for adding additional POPs chemicals in
the future.
Polychlorinated biphenyls (PCBs) also have been
banned in most industrialized countries since the
late 1970s. Large quantities, however, remain in
storage in many countries, including the United
States. PCBs also are still permitted in some closed
electrical systems and can be found in old trans-
formers, fluorescent lighting fixtures and other
appliances. Used primarily as coolants and lubri-
cants in electrical transformers and other equip-
ment, this group of chlorinated industrial
chemicals is highly toxic to both wildlife and
humans (Orris et al. 2000). PCBs are stable and
persistent, and there is evidence that they have
been transported thousands of kilometers in the
atmosphere (Environment Canada 1995). PCBs are
the chemicals that most frequently cause govern-
ment warnings (advisories) against consumption of
fish and wildlife in the United States (U.S. EPA
1999).
Dioxins and furans are byproducts of chlorine-
based industrial processes and incineration. Pri-
mary sources include the bleaching of paper prod-
ucts, manufacture of chlorinated chemicals, and the
burning of hospital, hazardous and municipal
waste. Dioxins are known to be toxic at extremely
low levels. The EPA has called one form of dioxin
the most potent synthetic carcinogen ever found
(IARC 1997, CHEJ 2000). Like many POPs,
dioxin is also a known endocrine disruptor, mim-
icking hormones such as estrogen to cause perma-
nent hormonal and metabolic changes in humans
and other animals. A recent report documented
dioxins in the Arctic environment and linked them
to key emissions sources in the United States
(Commoner 2000).
While some POPs have been banned or restricted,
they continue to circulate in the global environ-
ment at levels of concern. This is due both to the
persistence of these chemicals and continued use in
some countries. Dioxins continue to be released as
byproducts of production and waste disposal pro-
cesses worldwide, adding to the chemical burden
of populations around the globe. Rapid ratification
and effective implementation of the international
treaty is urgently needed to protect present and
future generations from POPs-related harm.
How POPs Enter the Food Supply
Worldwide, humans are exposed to persistent toxic
chemicals mainly through our food supply. In the
United States, POPs enter the human diet in several
ways.
Waterways. When released into rivers, lakes and
oceans, POPs collect in sediments. Away from
light and oxygen, these pesticides degrade slowly
and are ingested with sediments by small inverte-
brates at the bottom of the food chain. Once inside
the organism, POPs accumulate in fatty tissues.
Fish that eat pesticide-contaminated invertebrates
accumulate more of the chemical with each shrimp
or insect they ingest. A large, mature fish is likely
to contain much higher pesticide residues because
it has eaten more contaminated food over time than
a younger fish. The highest concentrations of these
Twelve POPs Targeted
for Global Ban
Pesticides Industrial Toxins
Aldrin and Byproducts
Chlordane PCBs
Endrin Furans
DDT Dioxins
Dieldrin
Heptachlor
Hexachlorobenzene
Mirex
Toxaphene
Nowhere to Hide 11
persistent, bioaccumulating chemicals are found in
those animals at the top of the food chain—
humans, predatory birds, seals and other predatory
animals (see below for a discussion of POPs-
related fish advisories issued in the United States).
Deposition on Land. POPs are deposited on U.S.
soil through a well-documented process of trans-
port by air currents and storm systems—sometimes
over great distances—and deposition through con-
tact with solid surfaces or through precipitation.
For example, dioxin released from an incinerator
could be deposited in either a nearby or distant pas-
ture where grazing cattle consume the chemical.
The ingested dioxin then contaminates the milk
and fatty tissue of the meat consumed by humans.
It also can become incorporated in the fatty tissue
of nursing calves, including those destined for veal
production. By the time the dioxin makes its way
into the bodies of consumers, it will have bioaccu-
mulated to much higher levels than originally
deposited on the grass (see Appendix A).
Banned Pesticides in Soils. Persistent soil resi-
dues of POPs pesticides that have been banned for
decades provide another primary source of POPs in
the food supply. DDT and its breakdown products,
as well as dieldrin and other organochlorine chemi-
cals, continue to be taken up by crops grown in soil
contaminated by heavy pesticide use in the 1960s
and 1970s. These soil-borne POPs residues also are
taken up in pastures and crops used as feed for
livestock and make their way to consumers
through livestock food products.
Pesticides Used to Produce Imported Foods.
POPs pesticide residues also are found in produce
imported from countries where the pesticides are
still in use or were recently banned (Groth, et al.,
2000). There is no clear evidence, however, that
imported produce has more POPs residues than
fruits and vegetables grown in the United States. In
the case of winter squash, for example, dieldrin
was found in 35 percent of the domestically pro-
duced samples, and found in only 4.2 percent of
the samples from Mexico. Moreover, the residue
levels were significantly higher in the U.S. squash.
In the case of carrots, in contrast, DDT was found
in 75 percent of Canadian samples taken, but only
found in 6.4 percent of the U.S.-grown carrots
tested. While the data on imported POPs residues
collected through USDA’s pesticide data program
is not comprehensive, the samples collected clearly
illustrate that contamination levels depend on a
range of variables. U.S. consumers cannot assume
that domestically produced fruits and vegetables
are less contaminated with POPs than imported
produce (USDA 1998, Groth et al. 2000).
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Overview of the Analysis: Scope, Methods
and Data Sources
This report was designed to paint the most accurate
picture possible of the prevalence of POPs in the
U.S. commercial food supply given available fed-
eral government and university data. The chemi-
cals examined in the report are the 12
organochlorine compounds targeted under the
recently negotiated POPs treaty.
Findings of POPs in food products are presented
for a typical U.S. winter holiday meal as well as for
hypothetical daily diets in four geographic regions
of the United States. Menus for breakfast, lunch,
snack and dinner are included in the daily diets for
each region, and the persistent toxic chemicals
found in each menu item are listed.
Recent scientific findings regarding the potential
public health implications of regular exposure to
even small amounts of POPs are reviewed and dis-
cussed. In addition, to put the levels of POPs in
food in perspective, health-based exposure thresh-
olds established by the Environmental Protection
Agency and the Agency for Toxic Substances and
Disease Registry are compared to intake levels of
certain POPs through food consumption (ATSDR
2000). These comparisons are made for the esti-
mated food consumption of both an average adult
(154 pounds) and a young child (44 pounds).
The Food and Drug Administration’s “action lev-
els” for POPs in food products were also reviewed
(FDA 1998). Action levels are used by FDA to
determine whether inspected food should be sold
to consumers. The level of public health protection
provided by this standard was evaluated by calcu-
lating the estimated consumption of a particular
POP chemical (DDT) if food contamination was at
the FDA action level, and then comparing this
intake with the health-based thresholds established
by EPA and ATSDR.
Data on POPs levels in food items are drawn pri-
marily from the latest reported findings of FDA’s
Total Diet Study, which reports annually on sam-
ples taken from a random, off-the-shelf “market-
basket” of fresh and processed foods consumed in
the United States (FDA 2000). The FDA POPs res-
idue data was supplemented by more comprehen-
sive annual pesticide residue data on fruits and
vegetables from the U.S. Department of Agricul-
ture’s Pesticide Data Program (Groth et al. 2000).
Given the random nature of sampling, some foods
contaminated by POPs do not show up in these
databases. In addition, information on PCB-con-
taminated foods, such as fish, which represent a
recognized health risk, are not included in the
FDA/dioxin analysis (see fish advisory discussion
below).
For dioxin residues in food, prior EPA and univer-
sity research was used, as neither the FDA nor the
USDA test regularly for the presence of dioxins
and furans (U.S. EPA 1994, Schecter et al. 1994).
Data on PCB residues in commercially sold food
products were not available for this report. How-
ever, evidence of POPs contamination of wild fish
obtained from a 1999 U.S. Environmental Protec-
tion Agency database on fish advisories is pre-
sented (U.S. EPA 1999).
The food samples tested by the federal government
are not attributable to any particular location. To
simulate the impact of POPs in each geographic
region, it was assumed that FDA findings on POPs
in food are representative of all regions in the
country. This assumption should not bias the
regional findings dramatically, given the extent of
the integration of national and international food
markets, which result in a tendency toward the
homogenization of the food supply.
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FINDINGS:Persistent Toxic Chemicals
Pervade the U.S. Food Supply
Overview of Findings
Evaluation of POPs residue data from several gov-
ernment and university sources produced startling
results. Residues of five or more persistent toxic
chemicals per food product are not unusual. The
most commonly found POPs are dieldrin and DDE.
Dieldrin is a highly persistent and very toxic orga-
nochlorine pesticide banned since the late 1970s.
DDE is a breakdown product of DDT, which has
been banned since 1972.
Residues are found in virtually all food catego-
ries—baked goods, fruit, vegetables, meat, poultry
and dairy products are all contaminated with POPs
that have been banned in the United States. A typi-
cal holiday dinner menu of 11 food items can
deliver 38 “hits” of POPs exposure, while hypo-
thetical daily meal plans developed for four U.S.
regions can each deliver between 63 and 79 POPs
exposures per day. By region, the number of expo-
sures found were as follows:
• Northeast: 64 exposures per day
• Midwest: 63 exposures per day
• Southeast: 70 exposures per day
• West: 66 exposures per day
According to FDA’s Total Diet Study, POPs resi-
dues usually occur at less than 100 parts per billion
(i.e., 100 pounds of DDT per billion pounds of
food). Scientific data indicate, however, that even
these low levels of exposure are cause for concern.
Moreover, the daily dietary exposure determined
from the data on POPs in food products is at or
near the safety thresholds established by various
federal agencies (see Appendix B, and full discus-
sion of the health effects of low-level exposure
below).
For example, both the U.S. Agency for Toxic Sub-
stances and Disease Registry (ATSDR) and the
EPA have set the level of concern for exposure to
the pesticide dieldrin at 0.05 micrograms per kilo-
gram of body weight per day—a total of 3.5 micro-
grams of dieldrin per day for a 154 pound (70 kg)
adult. This amount of dieldrin represents
0.000000005% of an average adult’s body weight,
similar to a drop of water in an Olympic-size
swimming pool (50 meters x 25 meters x 2 meters).
In the case of dioxin, even smaller levels of expo-
sure are cause for concern. Agency standards for
“safe” daily intake of dioxin range from EPA’s 0.70
picograms a day for a 154 pound adult1 to the
World Health Organization’s 70–280 picograms a
day—one picogram is one trillionth of a gram.
According to FDA’s food residue data, the average
daily exposure to dieldrin through food consump-
tion approaches the health-based “safety” thresh-
olds established by ATSDR and EPA for adults,
and it can exceed the standards for children (see
Figure 1). This illustrates that POPs residues are
occurring in food at or near levels understood by
federal agencies to be cause for concern.
The threat from POPs in food is greater than
implied by the bar chart in Figure 1, since dieldrin
is only one of the chemicals consumers are
exposed to through their daily diet. As the tables
for regional and holiday meal plans show, Ameri-
cans are exposed to an array of persistent toxic
chemicals every day through the foods they eat.
Health-based thresholds are established for indi-
vidual chemicals, while actual diets may include
PCB residues in a fish filet, dieldrin in a serving of
zucchini, and dioxin in an ice cream cone. Bit by
bit, these combinations of chemicals, which in
many instances cause the same or similar types of
negative health effects, accumulate in daily diets at
levels much higher than implied by the bar charts.
When it comes to protecting children from POPs,
“safe” levels of exposure are even lower. The Food
Quality Protection Act of 1996 recognized that
1. The EPA’s reference dose (RfD) assumes a life-
time of exposure at the level indicated.
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Figure 1. Comparison of Dieldrin in Regional Daily Diets and
Federal Health-Based Risk Thresholds
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
South North Midwest West Holiday
meal
Dieldrin Ingested by a Child in Typical Meals
from Different Regions of the U.S.
Maximum Exposure
Average Exposure
AmountofDieldrin(micrograms)
ATSDR Minimal
Risk Level (MRL)
for a 20 kg Child
0
0.5
1
1.5
2
2.5
3
3.5
South North Midwest West Holiday
meal
Dieldrin Ingested by an Adult in Typical Meals
from Different Regions of the U.S.
Maximum Exposure
Average Exposure
AmountofDieldrin(micrograms)
ATSDR Minimal
Risk Level (MRL)
for a 70 kg Adult
Nowhere to Hide 15
children are not simply small adults. Following
recommendations of an influential National Acad-
emy of Sciences study, the law requires EPA to
take into consideration the factors that make chil-
dren uniquely vulnerable to the risks posed by pes-
ticides in the food supply. Children eat dispro-
portionately more of certain foods on a pound-for-
pound body weight basis than does an average-
weight adult male. For heavily consumed foods,
their smaller size means children have a propor-
tionately greater exposure to POPs from those food
products. In addition, young children’s bodies are
engaged in a multitude of developmental processes
that are uniquely susceptible to harm from POPs.
Proportionately larger exposures and unique sus-
ceptibilities combine to make developing children
much more vulnerable to POPs than adults.
Top 10 Foods Most Contaminated with
Persistent Toxic Chemicals
The foods listed in the table below are the 10 foods
in FDA’s 1999 Total Diet Study found to be most
contaminated with residues from POP pesticides
and dioxin. The table lists the persistent toxic
chemicals found in each of these food products.
(Levels of contamination of each food item can be
found in Appendix C).
The food products included in the top 10 list are
distinguished by their containing residues of at
least three, and as many as seven, different POPs at
levels higher than those found in other foods. The
food items containing three or four POPs have high
levels of at least one particularly toxic chemical
(e.g., dioxin in meatloaf, chlordane in popcorn).
The list reflects contamination from POP pesti-
cides for which FDA has tested and for dioxins,
which have been examined by other researchers.
Data on the presence of PCBs and furans were not
available for this study.
The top 10 POP-contaminated foods, in alphabeti-
cal order, are butter, cantaloupe, cucumbers/pick-
les, meatloaf, peanuts, popcorn, radishes, spinach,
summer squash and winter squash.
Table 1: Top 10 Foods Most Contaminated with Persistent Toxic Chemicals
Chlordane DDE DDT Dieldrin Dioxin Endrin
Hepta-
chlor
Hexachloro-
benzene
Toxaphene
Butter X X X X X X X
Cantaloupe X X X X X
Cucumbers/
Pickles
X X X X X X
Meatloaf X X X X X
Peanuts X X X X
Popcorn X X X
Radishes X X X X X X X
Spinach X X X X X
Summer
squash
X X X X X X
Winter
squash
X X X X X X
Sources:
1. U.S. Food and Drug Administration. Total Diet Study, September 2000.
2. Schechter A., et al., 1994. “Congener-specific levels of dioxins and dibenzofurans in U.S. food and estimated daily dioxin toxic
equivalent intake.” Environmental Health Perspectives 102: 962–966.
3. U.S. EPA. 1994. Estimating Exposure to Dioxin-Like Compounds, Volume II: Properties, Sources, Occurrence and Back-
ground Exposures, U.S. EPA Office of Research and Development, EPA/600/6-88/005Cb, External Review Draft.
Nowhere to Hide 16
POPs Residues Contaminate Holiday Dinner and Daily Diets
Data from FDA’s “marketbasket” diet study and other sources documented above are presented in the
tables below to indicate the POPs residues found in a typical winter holiday dinner and in hypothetical
daily diets for four regions of the United States. The holiday dinner menu and regional daily diets were
created to illustrate the range and combination of POPs-contaminated foods that U.S. consumers might eat.
Information on dioxin contamination is included where data are available (see Appendix D for full listing
of contamination levels).
* * * * * * * *
HHHHoooolllliiiiddddaaaayyyy DDDDiiiinnnnnnnneeeerrrr MMMMeeeennnnuuuu
Roasted turkey with celery stuffing and giblet gravy
Baked winter squash
Green beans
Boiled potatoes with butter
Dill pickles
Pumpkin pie
* * * * * * * *
POPs Contaminants in Holiday Dinner Menu
Chlordane DDE DDT Dieldrin Dioxin Endrin
Hepta-
chlor
Hexachloro-
benzene
Toxaphene
Butter X X X X X X
Celery X X X
Gravy X X X
Green beans X X
Ice cream X X X X
Onion X
Dill pickles X X X X X
Boiled potatoes X X
Winter squash X X X X X X
Pumpkin pie X X X
Roasted turkey X X X
Nowhere to Hide 17
Southeastern Daily Meal Plan
Breakfast: Fried eggs, pork sausage; biscuit with butter; peaches; coffee/half & half
Lunch: Ham-and-cheese sandwich; potato chips; grapes; milk
Dinner: Fried chicken; corn bread; collards; summer squash; ice cream
Snacks: Popcorn; watermelon
POPs Contaminants in Southeastern Daily Meal Plan
Chlordane DDE DDT Dieldrin Dioxin Endrin
Hepta-
chlor
Hexachloro-
benzene
Toxaphene
Butter X X X X X X
Cheese, swiss X X X X
Fried chicken X X X
Collards X X X X X
Cornbread X X X
Eggs, fried X X X
Grapes X X
Half & half X X X X X
Ham X X X
Ice cream X X X X
Mayonnaise X X
Whole milk X X X X
Peaches X X
Popcorn X X X
Pork sausage X X X X X X
Potato chips X X X X X
Summer squash X X X X X X X X
Watermelon X
Yellow mustard X
Nowhere to Hide 18
Northeastern Daily Meal Plan
Breakfast: Bagel with lox and cream cheese, coffee
Lunch: Clam chowder, tuna sandwich, French fries with ketchup
Dinner: Beef chuck roast; brown beans; baked potato with butter; boiled carrots; sugar cookies
Snacks: Peanut butter on celery; raisins
POPs Contaminants in Northeastern Daily Meal Plan
Chlordane DDE DDT Dieldrin Dioxin Endrin
Hepta-
chlor
Hexachloro-
benzene
Toxaphene
Bagel X
Chuck roast X X X X X
Butter X X X X X X
Cantaloupe X X X X X
Carrots X X X
Celery X X X
Clam chowder X X
Coleslaw X X X
Cream cheese X X X X X
French fries X X X X
Ketchup X X
Lox (Salmon) X X X X X
Mayonnaise X X
Milk (2%) X X X
Mustard X
Peanut butter X X X X
Potato, baked X X X
Raisins X X
Sugar cookies X X
Tuna, in oil X X X
Nowhere to Hide 19
Midwestern Daily Meal Plan
Breakfast: Scrambled eggs; hash brown potatoes; bacon; sweet cherries; coffee/half & half
Lunch: Grilled-cheese sandwich; pickles; cottage cheese/peaches; chocolate chip cookies; milk
Dinner: Meatloaf; baked potato/sour cream; green beans/mushroom sauce; fruit cocktail; pumpkin pie
Snacks: Potato chips; grapes
POPs Contaminants in Midwestern Daily Meal Plan
Chlordane DDE DDT Dieldrin Dioxin Endrin
Hepta-
chlor
Hexachloro-
benzene
Toxaphene
Bacon X X X X X
Cheese,
american
X X X X X
Cherries, sweet X
Cookies,
choc. chip
X
Cottage cheese X X X
Half & half X X X X X
Scrambled eggs X X X
Grapes X X
Green beans X X
Hash browns
(from boiled
potatoes)
X X
Meatloaf X X X X X
Whole milk X X X X
Mushroom
sauce
X X
Peaches X X
Sweet pickles X X X X X
Baked potato X X X
Potato chips X X X X X
Pumpkin pie X X X
Sour cream X X X X X
Nowhere to Hide 20
Western Daily Meal Plan
Breakfast: Yogurt/granola; cantaloupe slice; blueberry muffin; coffee/2% milk
Lunch: Spinach salad w/radish, bell pepper, cucumber, French dressing; quesadilla; strawberries; skim milk
Dinner: Baked salmon; rice; stir fried vegetables (carrot, summer squash, potatoes); fruit sherbet
Snacks: Trail mix with peanuts; apple
POPs Contaminants in Western Menu
Chlordane DDE DDT Dieldrin Dioxin Endrin
Hepta-
chlor
Hexachloro-
benzene
Toxaphene
Apples X
Blueberry
muffin
X
Cantaloupe X X X X X
Carrots X X X
Cheddar cheese X X X X X
Cucumber X X X X X X
French dressing X
Granola X
Green pepper X
Milk, 2% X X X
Skim milk X
Peanuts X X X X
Potatoes X X
Radish X X X X X X X
Salmon X X X X X
Sherbet X X
Spinach X X X X X
Strawberries X X X
Summer
squash
X X X X X X X X
Yogurt X X
Nowhere to Hide 21
FDA Action Levels Do Not Protect
Public Health
FDA is responsible for taking action to protect
consumers from food contamination. When the
residue level of a toxic chemical in a food product
tested by FDA is at or higher than FDA “action
levels,” FDA must remove the food from the mar-
ket. These action levels, however, are substantially
higher than the health-based standards. Thus, while
our analysis shows that POPs residues are found at
levels at or above health-based standards, contami-
nation is well below the level that would trigger
FDA action. (Several federal agencies have estab-
lished health-based standards for “safe” levels of
exposure to POPs chemicals—see Appendix B).
Suppose, for example, fish was contaminated by
DDT residues equal to the amount allowed by
FDA’s action level for the banned chemical.
Because FDA’s action level for DDT is signifi-
cantly higher than health-based standards set by
EPA and ATSDR, consumption of a single serving
of fish would expose a consumer to almost 50
times the daily exposure considered “safe” by
those health-based standards.
Table 2: Daily DDT Intake Per Person if Food is
Contaminated with DDT Allowed by FDA Action Levels
Food Item
Amount of Food
Ingested
(g)
FDA Action
Level
(ug/g)a
Total Amount of
Pesticide Ingested
(ug)
Eggs 125 0.50 62.5
Melon 125 0.10 12.5
Milk 250 1.25 312
Toast (grains) 250 0.50 125
Carrots 125 3.00 375
Cucumbers 125 0.10 12.5
Tomatoes 125 0.05 6.2
Spinach 125 0.50 62.5
Radishes 62.5 0.20 12.5
Fish 372 5.00 1860
Eggplant 125 0.10 12.5
Legume 250 0.20 50
Potatoes 250 1.00 250
Total 3,154
ATSDR MRLb
(adult)
35
ATSDR MRLc
(child)
10
a
Micrograms of pesticide residue allowed per gram of food.
b Agency for Toxic Substances and Disease Registry, Minimal Risk Level for a 70 kg adult.
c Agency for Toxic Substances and Disease Registry, Minimal Risk Level for a 20 kg child.
Nowhere to Hide 22
If a glass of milk contained an amount of DDT
equal to the level allowed by FDA’s action level, it
would contain nearly 10 times as much DDT as the
daily exposure level considered safe by EPA and
ATSDR.
As illustrated in Table 2, eating a full day’s diet of
items contaminated with DDT at levels allowed by
FDA would bring an adult’s exposure to about 90
times the safe level established by ATSDR’s
health-based standards (Minimal Risk Levels or
“MRLs”). A child’s exposure to amounts of DDT
allowed by FDA’s action levels would be more
than 300 times the health-based standard. While it
is unlikely that an entire day’s diet would consist of
all items contaminated at FDA’s action levels, the
table illustrates the dramatic extent to which FDA’s
action levels fall short of other federal agency stan-
dards of public health protection.
PCBs in Food
No data on PCBs in commercially sold food is
available from federal agencies. However, data on
PCB contamination of fish in the nation’s rivers
and lakes suggests that PCBs, like the other POPs
being considered for the global treaty, contaminate
the commercial food supply. The most recent
(1999) data from EPA’s fish and wildlife advisories
database indicate that PCBs are the dominant cause
of government warnings against consumption of
fish caught in the wild (see box below for data
from selected states). Some of the most dramatic
statistics derived from the database include the fol-
lowing:
• Of 13,237 fish advisories in force as of early
1999, 3,855 (29%) were caused by POPs in
fish;
• Of the 3,855 POPs advisories, 3,101 (80%)
were caused by PCB contamination of fish;
and,
• Of the 3,101 PCB advisories, 2,551 (82%)
occurred in the nine states bordering the Great
Lakes.
POPs, Especially PCBs, are Pervasive in Fish
The U.S. Environmental Protection Agency has compiled data about fish advisories
issued throughout the country. The 1999 database shows widespread chemical contami-
nation of U.S. lakes and rivers and widespread contamination of fish by POPs, especially
PCBs. The EPA database includes the following POP and PCB contamination:
State POPs-Related Advisories Advsories Involving PCBs
(Number) (Percent) (Number) (Percent)
California 69 64% 32 46%
Illinois 61 95% 53 87%
Indiana 944 58% 944 100%
Massachusetts 133 46% 69 52%
Michigan 523 73% 443 85%
New York 309 86% 185 60%
Ohio 109 74% 98 90%
Pennsylvania 98 99% 85 87%
Wisconsin 484 28% 477 99%
Source: U.S. EPA, Office of Water, 1999. Listing of Fish and Wildlife Advisories.
Nowhere to Hide 23
Persistent Toxic Chemicals Are Linked
to a Variety of Health Problems
The chemicals targeted by the global POPs treaty
are associated with a long list of serious health
problems, including cancer, neurological damage,
birth defects, sterility and immune system defects
(see Table 3 below).
In the timeframe of widespread use of persistent
toxic chemicals, various disease registries and sur-
veillance efforts show increased incidence of
breast cancer, learning disabilities and reproductive
system damage. No one can say with certainty the
extent to which exposure to POPs is responsible
for these trends; we are exposed to a variety of pes-
ticides and other chemicals in our daily lives that
certainly contribute to these diseases. Nevertheless,
the scientific studies used to compile Table 3, as
well as many of those cited throughout this report,
indicate that exposure to POPs is linked to numer-
ous chronic illnesses and developmental disorders.
Various U.S. and international agencies have estab-
lished maximum POPs exposure levels, above
which they have determined there is significant
cause for concern about increased risk of both can-
cer and non-cancer effects. While there are some
differences in the thresholds established by differ-
ent health and environmental agencies, the levels
of exposure triggering concern about potential
health damage are generally extremely low (see
Appendix B). Unfortunately our food supply is
contaminated with levels of these chemicals that
result in exposures at or above the health-based
standards.
For four decades, scientists and health profession-
als have warned us about the health effects of POPs
on people and animals. That is the reason most of
the POPs being considered in the global treaty
have been banned in the United States and in a
number of other countries for many years.
Breast Cancer on the Rise. An estimated
2,044,000 women are living with breast cancer in
the United States today (National Cancer Institute
2000). Of those, about 40,000 will die of the dis-
ease this year (American Cancer Society 2000). In
the year 2000, the incidence of newly diagnosed
cases of invasive breast cancer is predicted to
increase by four percent (American Cancer Society
2000). For ductal carcinoma in situ, or DCIS (a
condition of abnormal cells in the milk ducts that is
thought to be pre-cancerous), incidence rates rose
214 percent for women under age 50 between
1983–1997, and 329 percent for women older than
age 50 (National Cancer Institute 2000).
While there is a popular conception that breast can-
cer is largely linked to genetic factors, environ-
mental factors actually play a significant role
(Lichtenstein 2000). Several studies have specifi-
cally linked exposure to POPs pesticides to
increased risk of breast cancer. PCBs and
hexachlorobenzene, for example, have been linked
to increased risk of breast cancer malignancy (Lil-
jegren et al. 1998). Dieldrin exposure also has been
linked with significantly elevated breast cancer risk
(Davis et al. 1997, Hoyer et al. 1998).
Learning Disabilities and Autism. Nearly
12 million American children, or 17 percent of all
children in the U.S under age 18, suffer from learn-
ing, developmental or behavioral disabilities (Cen-
sus Bureau). Scientific research points to
environmental toxicants, including some persistent
toxic chemicals, as significant contributors to neu-
rodevelopmental problems (Schettler et al. 2000).
Developmental neurotoxicants are chemicals that
cause harm to the developing brain of a fetus, and
they include POPs like dioxins and PCBs (Schet-
tler et al. 2000). Reduced intellectual performance
has been measured in both children and monkeys
exposed to PCBs in utero (Jacobson and Jacobson
1996, Rice 1999).
In addition, the prevalence of autism has doubled
in the past 30 years. California alone has seen a
210 percent increase in the number of children
receiving services for autism (National Environ-
mental Trust 2000). Autism incidence likely arises
from a combination of genetic defects and expo-
sure to toxic chemicals, according to the California
Birth Defects Monitoring Program, which is run
jointly by the state of California and the March of
Dimes.
Nowhere to Hide 24
Endocrine Disruption: Small Amounts of
POPs, Serious Health Impacts. In the past
decade, disturbing evidence has emerged that seri-
ous damage can be caused by exposure to extraor-
dinarily low levels of POPs. The reason for this lies
in the ability of POPs to mimic human and animal
hormones, including the male and female sex hor-
mones responsible for the proper development of
the fetus. These chemicals all are capable of cross-
ing the placenta during gestation, and as a result,
mixed messages are sent to the developing fetus.
These hormonal messages are critically important
to the developmental process, in which specialized
organs and integrated reproductive, immune and
Table 3. Health Effects of POPs Covered by Global Treatya
Chemical Contaminant Health Effects Associated with Chemical
Aldrin, Dieldrin, Endrin • Probable human carcinogen (aldrin,
dieldrin)
• Immune system suppression
• Nervous system disorders
• Reproductive damage
• Liver damage
• Birth defects: abnormal bone formation in
animals (endrin)
• Kidney damage
• Suspected endocrine disruption
• Developmental toxin (endrin)
Chlordane and Heptachlor • Probable human carcinogen
• Immune system suppression
• Blood disorders
• Liver damage
• Central nervous system disorders
• Suspected endocrine disruption
• Developmental disorders (heptachlor)
DDT, DDE • Probable human carcinogen
• Reproductive failure in wildlife
• Liver damage
• Central nervous system disorders
• Known endocrine disruption
• Developmental disorders
• Shortened lactation in nursing women
Dioxins and Furans • Dioxin is a known human carcinogenb;
Furans are possible carcinogens
• Altered immune function
• Central nervous system disorders
• Chloracne and other skin disorders
• Disrupts liver and kidney function
• Reproductive effects: altered sex ratio,
reduced fertility
• Endometriosis
• Known endocrine disruption
• Developmental disorders, including birth
defects
Hexachlorobenzene • Probable human carcinogen
• Disrupts hormone function
• Damages liver, thyroid, kidneys, blood and
immune system
• Suspected endocrine disruption
• Developmental toxin
Mirex • Possible carcinogen in humans
• Suppresses immune system
• Suspected endocrine disruption
•
• Damages liver, stomach, kidneys, thyroid,
nervous and reproductive systems
Toxaphene • Probable carcinogen in humans
• Reproductive/developmental effects
• Suspected endocrine disruption
• Damages lungs, kidneys, and nervous and
immune systems
PCBs • Probable human carcinogen
• Chloracne and other skin disorders; Liver
damage
• Developmental disorders
• Neurodevelopmental effects: reduced IQ
and short term memory; spatial effects;
hyperactivity
• Endocrine disruption
a. Sources: Agency for Toxic Substances and Disease Registry Toxicity Profiles, IARC 1997, Orris et al. 2000.
b. IARC cancer rating is cited for dioxin; all other cancer ratings are from the U.S. EPA’s Integrated Risk Information Sys-
tem or U.S. EPA Office of Pesticide Programs List of Chemicals Evaluated for Carcinogenic Potential, August 26, 1999.
Nowhere to Hide 25
neurological systems are formed. Any disruption
can cause permanent damage to these developing
systems.
The timing of chemical exposure to the developing
fetus or infant is crucial. Because hormones are
active at very low concentrations, even a tiny dose
of an endocrine disruptor can have a profound
effect if exposure occurs during critical times in the
development of the fetus or infant. Because the
development of different organ systems, the
immune system and the nervous system occurs at
different times during gestation and infancy, the
vulnerability of various systems depends strongly
on the timing of the dose.
Humans are not the only victims of endocrine dis-
ruption caused by POPs. The rapid decline in bird
populations in the 1960s and 1970s caused by the
POPs pesticide DDT was due to endocrine-disrupt-
ing effects. Exposure of developing animals to
these chemicals, in utero or in eggs, has been asso-
ciated with feminization or demasculinization of
male offspring or masculinization of female off-
spring. In fish, endocrine disruptors interrupt nor-
mal development and cause male fish to have
female characteristics. These outward symptoms of
developmental disruption are accompanied by
reduced fertility and even sterility in adults, as well
as lower hatch rates and viability of offspring
(Goodbred et al. 1996). Disruption of the balance
of endocrine hormones during development of
young fish also can cause defects of the skeletal
system, resulting in deformities and stunted growth
(Ewing 1999).
Fertility Problems: Endometriosis and Lower
Sperm Counts. POPs also might be affecting our
ability to conceive children. Recent studies demon-
strate a correlation between exposure to POPs and
the incidence of a variety of reproductive effects,
including infertility (MacLusky et al. 1998,
Edmunds et al. 2000, Grey et al. 1999, Ulrich et al.
2000). Some fertility problems are likely due to the
endocrine-disrupting ability of these chemicals and
include effects such as endometriosis in women
and lowered sperm counts in men (Guo 2000).
Mounting evidence links exposure to POPs and
other chemicals to increased incidence of
endometriosis in women. Endometriosis is a dis-
ease in which the endometrial tissue normally
found in the uterus migrates to other parts of the
body. Infertility is a very common result as the dis-
ease progresses, affecting 30 percent to 40 percent
of women with the disease (Susag 1998; see also
www.endometriosisassn.org).
Endometriosis incidence has skyrocketed in recent
years, and now affects at least 5.5 million Ameri-
can women—about 15 percent of women of repro-
ductive age. The percentage of women with
endometriosis reporting symptoms before age 15
has jumped from 15 percent to 38 percent in the
past 15 years. From 1965–1984 alone, hysterecto-
mies for 15- to 24-year-old women due to
endometriosis increased 250 percent, and 186 per-
cent for 25- to 34-year-old women. One laboratory
animal study directly correlated the incidence of
endometriosis with dioxin exposure, with the
severity of the disease dependent upon the dioxin
administered (Susag 1998; see also
www.endometriosisassn.org).
Male fertility statistics also show troubling trends.
In particular, male sperm density has significantly
declined since the early years of the chemical age.
Between 1938 and 1990, sperm density declined in
the United States at a rate of 1.5 percent per year,
while in Europe the numbers are 3 percent per year
(Swan 2000).
POPs Have Cumulative Effects. Many POPs
exhibit similar modes of action on the human body,
resulting in additive or even synergistic effects. In
other words, the health effects resulting from expo-
sure to multiple chemicals can be substantially
greater than those resulting from exposure to a sin-
gle chemical. The effects are especially pro-
nounced on a developing fetus or infant (Vonier et
al. 1996). The fact that additive and/or synergistic
effects are common for POPs makes a strong case
for banning the use of the entire class of chemicals,
not just a few of the worst offenders.
Nowhere to Hide 26
CONCLUSION AND RECOMMENDATIONS
This study shows the ubiquitous presence of per-
sistent toxic chemicals in the U.S. food supply
despite the fact that most of these pesticides have
been banned for use in this country for many years.
Highly toxic persistent toxic chemicals are found
in food as a result of their use abroad and their
release by domestic manufacturing processes and
waste incineration, as well as residues of historical
use in this country. As long as POPs continue to be
produced and used anywhere, they will continue to
contaminate the U.S. food supply and threaten the
health of American consumers.
There is little that can be done to immediately
reduce the level of persistent toxic chemical levels
in food. In some cases, heavy concentrations in soil
and water can be cleaned up, and cropping choices
can be made to avoid cultivation of certain crops in
POPs-contaminated agricultural lands. Given
enough years, even these persistent chemicals will
break down into harmless compounds. A combina-
tion of the passage of time, prevention of addi-
tional POPs accumulations, and clean up of POPs
in our soil and waterways can lay the groundwork
for a virtually POPs-free world for future genera-
tions of Americans.
From a health-protection standpoint, the evidence
strongly indicates that American consumers would
be served best by a implementaton of the precau-
tionary principle to prevent additional accumula-
tion of POPs in our air, water and soil. Given the
serious health risks associated with even extremely
small levels of exposure to POPs, prevention of
further food contamination must be made a
national health policy priority.
The global POPs treaty offers the most promising
vehicle for preventing further accumulation of per-
sistent toxic chemicals in food and giving future
generations the chance they deserve to experience
life free from harm from persistent toxic chemi-
cals. Early and effective implementation of the
treaty should be an urgent priority for the current
U.S. Administration.
Nowhere to Hide 27
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Persistent Toxic Chemicals Found in Nearly All U.S. Foods

  • 1. Nowhere to Hide Persistent Toxic Chemicals in the U.S. Food Supply March 2001 Pesticide Action Network North America Commonweal
  • 2.
  • 3. Authors Kristin S. Schafer, Pesticide Action Network Susan E. Kegley, Pesticide Action Network Sharyle Patton, Commonweal Pesticide Action Network Founded in 1982, Pesticide Action Network is an international coalition of more than 400 citizens groups in more than 60 countries working to oppose the misuse of pesticides and to promote sustainable and eco- logically sound pest management. 49 Powell Street, Suite 500 San Francisco, CA 94102 Tel: (415) 981-1771 Fax: (415) 981-1991 Email: panna@panna.org Website: www.panna.org Commonweal Commonweal, founded in 1976, is a nonprofit health and environmental research institute. Commonweal has three primary areas of program interest: children, health and the environment. In these three interest areas, we initiate or collaborate in service, research, demonstration, policy and educational projects. Commonweal also operates a retreat center that is available for group and individual retreats when not in use for Commonweal programs. P.O. Box 316 Bolinas, CA 94924 Tel: (415) 868-0970 Second Edition Copyright 2001 by Pesticide Action Network North America Regional Center. Permission is granted to reproduce portions of this report, provided the title and publishing organizations, Pesticide Action Network North America Regional Center and Commonweal, are acknowledged. Printed on recycled paper.
  • 4. Acknowledgments This report was developed as part of an effort by a number of U.S. nonprofit organizations concerned about environmental health to bring public attention to the dangers posed by persistent toxic chemicals. This “StopPOPs” effort shaped and informed the development of this report, and we thank all of the partic- ipating organizations for their input and support. Many individuals contributed to this report. Ted Schettler (Science and Environmental Health Network), Charlotte Brody (Center for Environmental Health and Justice) and Monica Moore (Pesticide Action Net- work) reviewed the report and provided important comments. Richard Wiles (Environmental Working Group) and Charles Benbrook (Benbrook Consulting) assisted with ideas on food residue data analysis. Katie Silberman (Center for Environmental Health), Kate Holcombe (Commonweal) and Aimee Kingery (Pesticide Action Network) provided research support. Pesticide Action Network’s work on persistent organic pollutants is made possible by grants from the Jen- nifer Altman Foundation, the Homeland Foundation, the Mitchell Kapor Foundation and Joshua Mailman. The views expressed in this report are those of the authors and do not necessarily reflect the views of our funders. The authors alone bear responsibility for any factual errors.
  • 5. TABLE OF CONTENTS Acknowledgments............................................................................................................ 4 A Note to Readers............................................................................................................ 6 1. EXECUTIVE SUMMARY.............................................................................................. 7 2. INTRODUCTION: Persistent Toxic Chemicals, the Food Supply and the Global POPs Treaty ........................................................ 9 The Global POPs Treaty How POPs Enter the Food Supply Overview of the Analysis: Scope, Methods and Data Sources 3. FINDINGS: Persistent Toxic Chemicals Pervade the U.S. Food Supply .......................................................................................... 13 Overview of Findings Top Ten Foods Most Contaminated with POPs POPs Residues Contaminate Holiday Dinner and Daily Diets FDA Action Levels Do Not Protect Public Health PCBs in Food Persistent Toxic Chemicals Are Linked to a Variety of Health Problems 4. CONCLUSION AND RECOMMENDATIONS .............................................................. 27 5. REFERENCES AND ONLINE RESOURCES.................................................................. 28 APPENDIX A: Long-Range Deposition of POPs APPENDIX B: Health-Based Standards for POPs Exposure APPENDIX C: POPs Residue Levels on Top Ten Contaminated Foods APPENDIX D: POPs Residue Levels in Holiday Menu and Regional Diets APPENDIX E: Dieldrin Levels in Regional Menus as a Percent of ATSDR’s MRL
  • 6. Nowhere to Hide 6 A Note to Readers This report documents that persistent toxic chemicals are pervasive in the U.S. food supply. In the final analysis, however, the report is not about U.S. food production or processing. Today’s farmers and food processing companies, after all, are not to blame for the contamination docu- mented in this report. Most of the persistent organic pollutants or “POPs” targeted for global elimination under the recently negotiated international POPs treaty were banned in the United States years ago. Never- theless, these POPs continue to make their way into the food supply from sources outside of U.S. agricul- ture. In a very real sense, therefore, today’s farmers, food processing companies and the consumers they service are largely victims of previous and continuing global production and use of these POPs. The new global POPs treaty offers an unprecedented opportunity to eliminate production and use of some of the most dangerous persistent toxic chemicals ever produced. The fact that the treaty is scheduled to be signed in May 2001 in Stockholm, Sweden is cause for celebration indeed. However, the “Stockholm Con- vention” will come into effect only after 50 countries have ratified it. So unless and until the treaty is rati- fied and effectively implemented, these dangerous chemicals will continue to be produced, released into the environment, and make their way into the diets of consumers here and abroad. We urge leaders in U.S. agriculture and the food industry to join us in pressing the Bush Administration to play a leadership role in supporting the rapid ratification and implementation of a strong POPs treaty that is designed to protect the health of present and future generations. Monica Moore Program Director Pesticide Action Network San Francisco, CA
  • 7. Nowhere to Hide 7 EXECUTIVE SUMMARY A class of toxic chemicals known as persistent organic pollutants (POPs) are among the most dan- gerous compounds ever produced. They include industrial chemicals, byproducts of manufacturing processes and waste incineration, and pesticides that have been linked to devastating human health consequences. Despite their hazards, POPs continue to be pro- duced, used and stored in many countries. Because they are long-lasting and travel long distances in global air and water currents, even POPs already banned in the United States, such as DDT and PCBs, still make their way into the U.S. food supply. This report is being released following the interna- tional community’s successful negotiation of a glo- bal treaty in December 2000 to eliminate the worldwide production and use of 12 of the worst persistent toxic chemicals, including DDT, PCBs, dieldrin and dioxins. The United Nations-spon- sored accord reflects worldwide recognition that stopping further POP contamination of any coun- try’s food supply and environment can only be accomplished through effective global coopera- tion. The purpose of the report is to construct the most comprehensive picture possible of the prevalence of persistent toxic chemicals in the U.S. commer- cial food supply, given available federal govern- ment and university data. The compounds examined in the report are the 12 chemicals to be eliminated under the global POPs treaty. Findings of POPs in food products are presented for a stereotypical U.S. Thanksgiving/Christmas holiday meal as well as for hypothetical daily diets in four geographic regions of the country: the Southeast, the Northeast, the Midwest and the West. Menus for breakfast, lunch, snack and dinner are included in the daily diets for each region. The POP contaminants and residue levels found in each food item are listed. Data on POPs levels in food items are drawn primarily from the year 2000 ver- sion of the Food and Drug Administration’s annual Total Diet Study and the latest annual pesticide res- idue data on fruits and vegetables from the U.S. Department of Agriculture’s Pesticide Data Pro- gram. Persistent Toxic Chemicals Pervade the U.S. Food Supply The evaluation of POPs residue data produced star- tling results, including the following: • Virtually all food products are contaminated with POPs that have been banned in the United States—baked goods, fruit, vegetables, meat, poultry and dairy products. • It is not unusual for daily diets to contain food items contaminated with three to seven POPs. • A hypothetical holiday dinner menu of 11 food items can deliver 38 “hits” of POPs exposure (where a hit is one persistent toxic chemical on one food item). • Hypothetical daily meal plans, for four U.S. regions, can each deliver between 63 and 70 exposures to POPs per day. By region, the number of exposures found were as follows: • Northeast: 64 exposures per day • Midwest: 63 exposures per day • Southeast: 70 exposures per day • West: 66 exposures per day The top 10 POPs-contaminated food items, in alphabetical order, are butter, cantaloupe, cucum- bers/pickles, meatloaf, peanuts, popcorn, radishes, spinach, summer squash and winter squash. While POPs residue levels in individual food items are small, when viewed in the context of daily amounts of food consumption, the contamination found is at or near levels of concern according to health-based standards set by the Centers for Dis- ease Control and Prevention’s Agency for Toxic Substances and Disease Registry (ATSDR) and the EPA. The two most pervasive POPs in food are dieldrin and DDE. Dieldrin is a highly persistent and toxic organochlorine pesticide banned since the late 1970s. DDE is a breakdown product of DDT,
  • 8. Nowhere to Hide 8 which has been banned since 1972. Exposure to these chemicals has been associated with breast cancer, other types of cancer, immune system sup- pression, nervous system disorders, reproductive damage and disruption of hormonal systems. Low Level POPs Exposure Associated with Serious Health Effects • Developing fetuses and children are especially vulnerable to problems caused by exposure to POPs. Recent scientific studies show that exposure to miniscule levels of POPs at crucial times in fetal and infant development can dis- rupt or damage reproductive, neurological and immune systems. • Exposure to low levels of POPs has likely con- tributed to disturbing public health trends, including increased incidence of breast cancer, learning disabilities and other neurodevelop- mental problems, as well as reproductive prob- lems. • The Food and Drug Administration’s “action levels” for determining whether contaminated foods should be removed from the U.S. food market do not protect American food consum- ers from the health threats of POPs. In some cases, consumption of a single food item con- taminated at levels allowed by FDA would expose the consumer to more than 50 times the daily exposure levels considered “safe” by other agencies. Recommendations This study shows the ubiquitous presence of per- sistent toxic chemicals in the U.S. food supply, despite the fact that most of the POPs pesticides that have been used for food production have been banned in this country for years. From a health protection standpoint, the evidence presented strongly indicates that American con- sumers would be served best by implementing the precautionary principle to prevent additional accu- mulation of POPs in our air, water and soil. Given the serious health risks associated with even extremely small levels of exposure to POPs, pre- venting further contamination of food must be a national priority. The recently negotiated POPs treaty includes refer- ences to the precautionary approach, and offers a vehicle for preventing further accumulation of per- sistent toxic chemicals in U.S. food supplies. Effective implementation of the treaty, including the early addition of POPs chemicals not included in the initial targeted list,will give future genera- tions everywhere the chance to experience life free from fear of harm from persistent toxic chemicals. Rapid ratification and implementation of the treaty should be an urgent priority for the current U.S. Administration.
  • 9. Nowhere to Hide 9 INTRODUCTION: Persistent Toxic Chemicals, the Food Supply and the Global Pops Treaty A class of toxic chemicals known as persistent organic pollutants (POPs) are among the most dan- gerous compounds ever produced. This ubiquitous class of chemicals includes many pesticides, indus- trial chemicals and byproducts of certain manufac- turing processes and waste incineration. The characteristics that make these chemicals unique also make them an urgent global environmental health problem: • POPs persist in the environment; • POPs build up in body fat and concentrate at higher levels (bioaccumulate) as they make their way up the food chain; • POPs travel in global air and water currents; and • POPs are linked with serious health effects in humans and other living organisms. In just a few decades, POPs have spread through- out the environment to threaten human health and to damage land and water ecosystems all over the world. All living organisms on Earth now carry measurable levels of POPs in their tissues. POPs have been found in sea mammals at levels high enough to qualify their bodies as hazardous waste under U.S. law (Cummins, JE 1988). Nor are humans immune to contamination. Evidence of POPs contamination in human blood and breast milk has been documented worldwide (CHEJ 2000, Solomon 2000). There is strong evidence that exposure to even miniscule amounts of POPs at critical periods of development—particularly in the womb—can cause irreversible damage. The effects of such exposures may take years to develop, sometimes appearing first in the offspring of exposed parents. Some of the human health effects now linked to POPs exposure include cancer, learning disorders, impaired immune function, reproductive problems (e.g., low sperm counts, endometriosis) and diabe- tes (Orris et al. 2000, Colburn et al. 1996). Despite their hazards, these chemicals continue to be produced, used and stored in many countries. Even where national bans or other controls exist, these restrictions are often poorly enforced—and in any case, they cannot protect citizens from expo- sure to POPs that have migrated from other regions where the chemicals are still in use. Because they are persistent and continue to be pro- duced and released into the global environment, even POPs already banned in the United States, such as DDT and PCBs, make their way into the U.S. food supply. Once in the air, the water and the soil, these chemicals resist breaking down. Some have half-lives measured in decades, and they remain in water and soil as well as plants and ani- mals that ultimately, in one form or another, pro- vide food for humans. POPs that were once particles in the sediment of a riverbed, in soil or in grasses find their way into the fatty tissue and milk of livestock or into the vegetables that pull POPs from the soil in the same way they take in nutri- ents. It is no surprise, therefore, that POPs are pervasive in store-bought food as well as in fish and wildlife consumed after being caught in the wild. This pres- ence of POPs in the food supply creates a compel- ling and urgent need for action to prevent further release and buildup of these dangerous chemicals. The Global POPs Treaty Recognizing that the health risks from POPs can neither be managed by individual countries’ regu- lators nor contained by national borders, the United Nations Environment Programme sponsored an international agreement to phase out production, use and release of POPs. Twelve POPs have been identified as initial phaseout targets under the new treaty. This list includes nine organochlorine pesti-
  • 10. Nowhere to Hide 10 cides and three industrial chemicals/ byproducts (see box). The global POPs treaty is a promising vehicle for addressing POPs accumulation in the U.S. food supply. The nine pesticides on this initial list have been banned or severely restricted in the United States since the 1970s and 1980s. Most industrialized countries and many developing countries also have banned or restricted the use of these pesticides. It is important to note that while other POPs pesticides are present in the U.S. food supply, the focus of this report is limited to the initial list of chemicals targeted under the POPs treaty. The treaty includes provisions for adding additional POPs chemicals in the future. Polychlorinated biphenyls (PCBs) also have been banned in most industrialized countries since the late 1970s. Large quantities, however, remain in storage in many countries, including the United States. PCBs also are still permitted in some closed electrical systems and can be found in old trans- formers, fluorescent lighting fixtures and other appliances. Used primarily as coolants and lubri- cants in electrical transformers and other equip- ment, this group of chlorinated industrial chemicals is highly toxic to both wildlife and humans (Orris et al. 2000). PCBs are stable and persistent, and there is evidence that they have been transported thousands of kilometers in the atmosphere (Environment Canada 1995). PCBs are the chemicals that most frequently cause govern- ment warnings (advisories) against consumption of fish and wildlife in the United States (U.S. EPA 1999). Dioxins and furans are byproducts of chlorine- based industrial processes and incineration. Pri- mary sources include the bleaching of paper prod- ucts, manufacture of chlorinated chemicals, and the burning of hospital, hazardous and municipal waste. Dioxins are known to be toxic at extremely low levels. The EPA has called one form of dioxin the most potent synthetic carcinogen ever found (IARC 1997, CHEJ 2000). Like many POPs, dioxin is also a known endocrine disruptor, mim- icking hormones such as estrogen to cause perma- nent hormonal and metabolic changes in humans and other animals. A recent report documented dioxins in the Arctic environment and linked them to key emissions sources in the United States (Commoner 2000). While some POPs have been banned or restricted, they continue to circulate in the global environ- ment at levels of concern. This is due both to the persistence of these chemicals and continued use in some countries. Dioxins continue to be released as byproducts of production and waste disposal pro- cesses worldwide, adding to the chemical burden of populations around the globe. Rapid ratification and effective implementation of the international treaty is urgently needed to protect present and future generations from POPs-related harm. How POPs Enter the Food Supply Worldwide, humans are exposed to persistent toxic chemicals mainly through our food supply. In the United States, POPs enter the human diet in several ways. Waterways. When released into rivers, lakes and oceans, POPs collect in sediments. Away from light and oxygen, these pesticides degrade slowly and are ingested with sediments by small inverte- brates at the bottom of the food chain. Once inside the organism, POPs accumulate in fatty tissues. Fish that eat pesticide-contaminated invertebrates accumulate more of the chemical with each shrimp or insect they ingest. A large, mature fish is likely to contain much higher pesticide residues because it has eaten more contaminated food over time than a younger fish. The highest concentrations of these Twelve POPs Targeted for Global Ban Pesticides Industrial Toxins Aldrin and Byproducts Chlordane PCBs Endrin Furans DDT Dioxins Dieldrin Heptachlor Hexachlorobenzene Mirex Toxaphene
  • 11. Nowhere to Hide 11 persistent, bioaccumulating chemicals are found in those animals at the top of the food chain— humans, predatory birds, seals and other predatory animals (see below for a discussion of POPs- related fish advisories issued in the United States). Deposition on Land. POPs are deposited on U.S. soil through a well-documented process of trans- port by air currents and storm systems—sometimes over great distances—and deposition through con- tact with solid surfaces or through precipitation. For example, dioxin released from an incinerator could be deposited in either a nearby or distant pas- ture where grazing cattle consume the chemical. The ingested dioxin then contaminates the milk and fatty tissue of the meat consumed by humans. It also can become incorporated in the fatty tissue of nursing calves, including those destined for veal production. By the time the dioxin makes its way into the bodies of consumers, it will have bioaccu- mulated to much higher levels than originally deposited on the grass (see Appendix A). Banned Pesticides in Soils. Persistent soil resi- dues of POPs pesticides that have been banned for decades provide another primary source of POPs in the food supply. DDT and its breakdown products, as well as dieldrin and other organochlorine chemi- cals, continue to be taken up by crops grown in soil contaminated by heavy pesticide use in the 1960s and 1970s. These soil-borne POPs residues also are taken up in pastures and crops used as feed for livestock and make their way to consumers through livestock food products. Pesticides Used to Produce Imported Foods. POPs pesticide residues also are found in produce imported from countries where the pesticides are still in use or were recently banned (Groth, et al., 2000). There is no clear evidence, however, that imported produce has more POPs residues than fruits and vegetables grown in the United States. In the case of winter squash, for example, dieldrin was found in 35 percent of the domestically pro- duced samples, and found in only 4.2 percent of the samples from Mexico. Moreover, the residue levels were significantly higher in the U.S. squash. In the case of carrots, in contrast, DDT was found in 75 percent of Canadian samples taken, but only found in 6.4 percent of the U.S.-grown carrots tested. While the data on imported POPs residues collected through USDA’s pesticide data program is not comprehensive, the samples collected clearly illustrate that contamination levels depend on a range of variables. U.S. consumers cannot assume that domestically produced fruits and vegetables are less contaminated with POPs than imported produce (USDA 1998, Groth et al. 2000).
  • 12. Nowhere to Hide 12 Overview of the Analysis: Scope, Methods and Data Sources This report was designed to paint the most accurate picture possible of the prevalence of POPs in the U.S. commercial food supply given available fed- eral government and university data. The chemi- cals examined in the report are the 12 organochlorine compounds targeted under the recently negotiated POPs treaty. Findings of POPs in food products are presented for a typical U.S. winter holiday meal as well as for hypothetical daily diets in four geographic regions of the United States. Menus for breakfast, lunch, snack and dinner are included in the daily diets for each region, and the persistent toxic chemicals found in each menu item are listed. Recent scientific findings regarding the potential public health implications of regular exposure to even small amounts of POPs are reviewed and dis- cussed. In addition, to put the levels of POPs in food in perspective, health-based exposure thresh- olds established by the Environmental Protection Agency and the Agency for Toxic Substances and Disease Registry are compared to intake levels of certain POPs through food consumption (ATSDR 2000). These comparisons are made for the esti- mated food consumption of both an average adult (154 pounds) and a young child (44 pounds). The Food and Drug Administration’s “action lev- els” for POPs in food products were also reviewed (FDA 1998). Action levels are used by FDA to determine whether inspected food should be sold to consumers. The level of public health protection provided by this standard was evaluated by calcu- lating the estimated consumption of a particular POP chemical (DDT) if food contamination was at the FDA action level, and then comparing this intake with the health-based thresholds established by EPA and ATSDR. Data on POPs levels in food items are drawn pri- marily from the latest reported findings of FDA’s Total Diet Study, which reports annually on sam- ples taken from a random, off-the-shelf “market- basket” of fresh and processed foods consumed in the United States (FDA 2000). The FDA POPs res- idue data was supplemented by more comprehen- sive annual pesticide residue data on fruits and vegetables from the U.S. Department of Agricul- ture’s Pesticide Data Program (Groth et al. 2000). Given the random nature of sampling, some foods contaminated by POPs do not show up in these databases. In addition, information on PCB-con- taminated foods, such as fish, which represent a recognized health risk, are not included in the FDA/dioxin analysis (see fish advisory discussion below). For dioxin residues in food, prior EPA and univer- sity research was used, as neither the FDA nor the USDA test regularly for the presence of dioxins and furans (U.S. EPA 1994, Schecter et al. 1994). Data on PCB residues in commercially sold food products were not available for this report. How- ever, evidence of POPs contamination of wild fish obtained from a 1999 U.S. Environmental Protec- tion Agency database on fish advisories is pre- sented (U.S. EPA 1999). The food samples tested by the federal government are not attributable to any particular location. To simulate the impact of POPs in each geographic region, it was assumed that FDA findings on POPs in food are representative of all regions in the country. This assumption should not bias the regional findings dramatically, given the extent of the integration of national and international food markets, which result in a tendency toward the homogenization of the food supply.
  • 13. Nowhere to Hide 13 FINDINGS:Persistent Toxic Chemicals Pervade the U.S. Food Supply Overview of Findings Evaluation of POPs residue data from several gov- ernment and university sources produced startling results. Residues of five or more persistent toxic chemicals per food product are not unusual. The most commonly found POPs are dieldrin and DDE. Dieldrin is a highly persistent and very toxic orga- nochlorine pesticide banned since the late 1970s. DDE is a breakdown product of DDT, which has been banned since 1972. Residues are found in virtually all food catego- ries—baked goods, fruit, vegetables, meat, poultry and dairy products are all contaminated with POPs that have been banned in the United States. A typi- cal holiday dinner menu of 11 food items can deliver 38 “hits” of POPs exposure, while hypo- thetical daily meal plans developed for four U.S. regions can each deliver between 63 and 79 POPs exposures per day. By region, the number of expo- sures found were as follows: • Northeast: 64 exposures per day • Midwest: 63 exposures per day • Southeast: 70 exposures per day • West: 66 exposures per day According to FDA’s Total Diet Study, POPs resi- dues usually occur at less than 100 parts per billion (i.e., 100 pounds of DDT per billion pounds of food). Scientific data indicate, however, that even these low levels of exposure are cause for concern. Moreover, the daily dietary exposure determined from the data on POPs in food products is at or near the safety thresholds established by various federal agencies (see Appendix B, and full discus- sion of the health effects of low-level exposure below). For example, both the U.S. Agency for Toxic Sub- stances and Disease Registry (ATSDR) and the EPA have set the level of concern for exposure to the pesticide dieldrin at 0.05 micrograms per kilo- gram of body weight per day—a total of 3.5 micro- grams of dieldrin per day for a 154 pound (70 kg) adult. This amount of dieldrin represents 0.000000005% of an average adult’s body weight, similar to a drop of water in an Olympic-size swimming pool (50 meters x 25 meters x 2 meters). In the case of dioxin, even smaller levels of expo- sure are cause for concern. Agency standards for “safe” daily intake of dioxin range from EPA’s 0.70 picograms a day for a 154 pound adult1 to the World Health Organization’s 70–280 picograms a day—one picogram is one trillionth of a gram. According to FDA’s food residue data, the average daily exposure to dieldrin through food consump- tion approaches the health-based “safety” thresh- olds established by ATSDR and EPA for adults, and it can exceed the standards for children (see Figure 1). This illustrates that POPs residues are occurring in food at or near levels understood by federal agencies to be cause for concern. The threat from POPs in food is greater than implied by the bar chart in Figure 1, since dieldrin is only one of the chemicals consumers are exposed to through their daily diet. As the tables for regional and holiday meal plans show, Ameri- cans are exposed to an array of persistent toxic chemicals every day through the foods they eat. Health-based thresholds are established for indi- vidual chemicals, while actual diets may include PCB residues in a fish filet, dieldrin in a serving of zucchini, and dioxin in an ice cream cone. Bit by bit, these combinations of chemicals, which in many instances cause the same or similar types of negative health effects, accumulate in daily diets at levels much higher than implied by the bar charts. When it comes to protecting children from POPs, “safe” levels of exposure are even lower. The Food Quality Protection Act of 1996 recognized that 1. The EPA’s reference dose (RfD) assumes a life- time of exposure at the level indicated.
  • 14. Nowhere to Hide 14 Figure 1. Comparison of Dieldrin in Regional Daily Diets and Federal Health-Based Risk Thresholds 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 South North Midwest West Holiday meal Dieldrin Ingested by a Child in Typical Meals from Different Regions of the U.S. Maximum Exposure Average Exposure AmountofDieldrin(micrograms) ATSDR Minimal Risk Level (MRL) for a 20 kg Child 0 0.5 1 1.5 2 2.5 3 3.5 South North Midwest West Holiday meal Dieldrin Ingested by an Adult in Typical Meals from Different Regions of the U.S. Maximum Exposure Average Exposure AmountofDieldrin(micrograms) ATSDR Minimal Risk Level (MRL) for a 70 kg Adult
  • 15. Nowhere to Hide 15 children are not simply small adults. Following recommendations of an influential National Acad- emy of Sciences study, the law requires EPA to take into consideration the factors that make chil- dren uniquely vulnerable to the risks posed by pes- ticides in the food supply. Children eat dispro- portionately more of certain foods on a pound-for- pound body weight basis than does an average- weight adult male. For heavily consumed foods, their smaller size means children have a propor- tionately greater exposure to POPs from those food products. In addition, young children’s bodies are engaged in a multitude of developmental processes that are uniquely susceptible to harm from POPs. Proportionately larger exposures and unique sus- ceptibilities combine to make developing children much more vulnerable to POPs than adults. Top 10 Foods Most Contaminated with Persistent Toxic Chemicals The foods listed in the table below are the 10 foods in FDA’s 1999 Total Diet Study found to be most contaminated with residues from POP pesticides and dioxin. The table lists the persistent toxic chemicals found in each of these food products. (Levels of contamination of each food item can be found in Appendix C). The food products included in the top 10 list are distinguished by their containing residues of at least three, and as many as seven, different POPs at levels higher than those found in other foods. The food items containing three or four POPs have high levels of at least one particularly toxic chemical (e.g., dioxin in meatloaf, chlordane in popcorn). The list reflects contamination from POP pesti- cides for which FDA has tested and for dioxins, which have been examined by other researchers. Data on the presence of PCBs and furans were not available for this study. The top 10 POP-contaminated foods, in alphabeti- cal order, are butter, cantaloupe, cucumbers/pick- les, meatloaf, peanuts, popcorn, radishes, spinach, summer squash and winter squash. Table 1: Top 10 Foods Most Contaminated with Persistent Toxic Chemicals Chlordane DDE DDT Dieldrin Dioxin Endrin Hepta- chlor Hexachloro- benzene Toxaphene Butter X X X X X X X Cantaloupe X X X X X Cucumbers/ Pickles X X X X X X Meatloaf X X X X X Peanuts X X X X Popcorn X X X Radishes X X X X X X X Spinach X X X X X Summer squash X X X X X X Winter squash X X X X X X Sources: 1. U.S. Food and Drug Administration. Total Diet Study, September 2000. 2. Schechter A., et al., 1994. “Congener-specific levels of dioxins and dibenzofurans in U.S. food and estimated daily dioxin toxic equivalent intake.” Environmental Health Perspectives 102: 962–966. 3. U.S. EPA. 1994. Estimating Exposure to Dioxin-Like Compounds, Volume II: Properties, Sources, Occurrence and Back- ground Exposures, U.S. EPA Office of Research and Development, EPA/600/6-88/005Cb, External Review Draft.
  • 16. Nowhere to Hide 16 POPs Residues Contaminate Holiday Dinner and Daily Diets Data from FDA’s “marketbasket” diet study and other sources documented above are presented in the tables below to indicate the POPs residues found in a typical winter holiday dinner and in hypothetical daily diets for four regions of the United States. The holiday dinner menu and regional daily diets were created to illustrate the range and combination of POPs-contaminated foods that U.S. consumers might eat. Information on dioxin contamination is included where data are available (see Appendix D for full listing of contamination levels). * * * * * * * * HHHHoooolllliiiiddddaaaayyyy DDDDiiiinnnnnnnneeeerrrr MMMMeeeennnnuuuu Roasted turkey with celery stuffing and giblet gravy Baked winter squash Green beans Boiled potatoes with butter Dill pickles Pumpkin pie * * * * * * * * POPs Contaminants in Holiday Dinner Menu Chlordane DDE DDT Dieldrin Dioxin Endrin Hepta- chlor Hexachloro- benzene Toxaphene Butter X X X X X X Celery X X X Gravy X X X Green beans X X Ice cream X X X X Onion X Dill pickles X X X X X Boiled potatoes X X Winter squash X X X X X X Pumpkin pie X X X Roasted turkey X X X
  • 17. Nowhere to Hide 17 Southeastern Daily Meal Plan Breakfast: Fried eggs, pork sausage; biscuit with butter; peaches; coffee/half & half Lunch: Ham-and-cheese sandwich; potato chips; grapes; milk Dinner: Fried chicken; corn bread; collards; summer squash; ice cream Snacks: Popcorn; watermelon POPs Contaminants in Southeastern Daily Meal Plan Chlordane DDE DDT Dieldrin Dioxin Endrin Hepta- chlor Hexachloro- benzene Toxaphene Butter X X X X X X Cheese, swiss X X X X Fried chicken X X X Collards X X X X X Cornbread X X X Eggs, fried X X X Grapes X X Half & half X X X X X Ham X X X Ice cream X X X X Mayonnaise X X Whole milk X X X X Peaches X X Popcorn X X X Pork sausage X X X X X X Potato chips X X X X X Summer squash X X X X X X X X Watermelon X Yellow mustard X
  • 18. Nowhere to Hide 18 Northeastern Daily Meal Plan Breakfast: Bagel with lox and cream cheese, coffee Lunch: Clam chowder, tuna sandwich, French fries with ketchup Dinner: Beef chuck roast; brown beans; baked potato with butter; boiled carrots; sugar cookies Snacks: Peanut butter on celery; raisins POPs Contaminants in Northeastern Daily Meal Plan Chlordane DDE DDT Dieldrin Dioxin Endrin Hepta- chlor Hexachloro- benzene Toxaphene Bagel X Chuck roast X X X X X Butter X X X X X X Cantaloupe X X X X X Carrots X X X Celery X X X Clam chowder X X Coleslaw X X X Cream cheese X X X X X French fries X X X X Ketchup X X Lox (Salmon) X X X X X Mayonnaise X X Milk (2%) X X X Mustard X Peanut butter X X X X Potato, baked X X X Raisins X X Sugar cookies X X Tuna, in oil X X X
  • 19. Nowhere to Hide 19 Midwestern Daily Meal Plan Breakfast: Scrambled eggs; hash brown potatoes; bacon; sweet cherries; coffee/half & half Lunch: Grilled-cheese sandwich; pickles; cottage cheese/peaches; chocolate chip cookies; milk Dinner: Meatloaf; baked potato/sour cream; green beans/mushroom sauce; fruit cocktail; pumpkin pie Snacks: Potato chips; grapes POPs Contaminants in Midwestern Daily Meal Plan Chlordane DDE DDT Dieldrin Dioxin Endrin Hepta- chlor Hexachloro- benzene Toxaphene Bacon X X X X X Cheese, american X X X X X Cherries, sweet X Cookies, choc. chip X Cottage cheese X X X Half & half X X X X X Scrambled eggs X X X Grapes X X Green beans X X Hash browns (from boiled potatoes) X X Meatloaf X X X X X Whole milk X X X X Mushroom sauce X X Peaches X X Sweet pickles X X X X X Baked potato X X X Potato chips X X X X X Pumpkin pie X X X Sour cream X X X X X
  • 20. Nowhere to Hide 20 Western Daily Meal Plan Breakfast: Yogurt/granola; cantaloupe slice; blueberry muffin; coffee/2% milk Lunch: Spinach salad w/radish, bell pepper, cucumber, French dressing; quesadilla; strawberries; skim milk Dinner: Baked salmon; rice; stir fried vegetables (carrot, summer squash, potatoes); fruit sherbet Snacks: Trail mix with peanuts; apple POPs Contaminants in Western Menu Chlordane DDE DDT Dieldrin Dioxin Endrin Hepta- chlor Hexachloro- benzene Toxaphene Apples X Blueberry muffin X Cantaloupe X X X X X Carrots X X X Cheddar cheese X X X X X Cucumber X X X X X X French dressing X Granola X Green pepper X Milk, 2% X X X Skim milk X Peanuts X X X X Potatoes X X Radish X X X X X X X Salmon X X X X X Sherbet X X Spinach X X X X X Strawberries X X X Summer squash X X X X X X X X Yogurt X X
  • 21. Nowhere to Hide 21 FDA Action Levels Do Not Protect Public Health FDA is responsible for taking action to protect consumers from food contamination. When the residue level of a toxic chemical in a food product tested by FDA is at or higher than FDA “action levels,” FDA must remove the food from the mar- ket. These action levels, however, are substantially higher than the health-based standards. Thus, while our analysis shows that POPs residues are found at levels at or above health-based standards, contami- nation is well below the level that would trigger FDA action. (Several federal agencies have estab- lished health-based standards for “safe” levels of exposure to POPs chemicals—see Appendix B). Suppose, for example, fish was contaminated by DDT residues equal to the amount allowed by FDA’s action level for the banned chemical. Because FDA’s action level for DDT is signifi- cantly higher than health-based standards set by EPA and ATSDR, consumption of a single serving of fish would expose a consumer to almost 50 times the daily exposure considered “safe” by those health-based standards. Table 2: Daily DDT Intake Per Person if Food is Contaminated with DDT Allowed by FDA Action Levels Food Item Amount of Food Ingested (g) FDA Action Level (ug/g)a Total Amount of Pesticide Ingested (ug) Eggs 125 0.50 62.5 Melon 125 0.10 12.5 Milk 250 1.25 312 Toast (grains) 250 0.50 125 Carrots 125 3.00 375 Cucumbers 125 0.10 12.5 Tomatoes 125 0.05 6.2 Spinach 125 0.50 62.5 Radishes 62.5 0.20 12.5 Fish 372 5.00 1860 Eggplant 125 0.10 12.5 Legume 250 0.20 50 Potatoes 250 1.00 250 Total 3,154 ATSDR MRLb (adult) 35 ATSDR MRLc (child) 10 a Micrograms of pesticide residue allowed per gram of food. b Agency for Toxic Substances and Disease Registry, Minimal Risk Level for a 70 kg adult. c Agency for Toxic Substances and Disease Registry, Minimal Risk Level for a 20 kg child.
  • 22. Nowhere to Hide 22 If a glass of milk contained an amount of DDT equal to the level allowed by FDA’s action level, it would contain nearly 10 times as much DDT as the daily exposure level considered safe by EPA and ATSDR. As illustrated in Table 2, eating a full day’s diet of items contaminated with DDT at levels allowed by FDA would bring an adult’s exposure to about 90 times the safe level established by ATSDR’s health-based standards (Minimal Risk Levels or “MRLs”). A child’s exposure to amounts of DDT allowed by FDA’s action levels would be more than 300 times the health-based standard. While it is unlikely that an entire day’s diet would consist of all items contaminated at FDA’s action levels, the table illustrates the dramatic extent to which FDA’s action levels fall short of other federal agency stan- dards of public health protection. PCBs in Food No data on PCBs in commercially sold food is available from federal agencies. However, data on PCB contamination of fish in the nation’s rivers and lakes suggests that PCBs, like the other POPs being considered for the global treaty, contaminate the commercial food supply. The most recent (1999) data from EPA’s fish and wildlife advisories database indicate that PCBs are the dominant cause of government warnings against consumption of fish caught in the wild (see box below for data from selected states). Some of the most dramatic statistics derived from the database include the fol- lowing: • Of 13,237 fish advisories in force as of early 1999, 3,855 (29%) were caused by POPs in fish; • Of the 3,855 POPs advisories, 3,101 (80%) were caused by PCB contamination of fish; and, • Of the 3,101 PCB advisories, 2,551 (82%) occurred in the nine states bordering the Great Lakes. POPs, Especially PCBs, are Pervasive in Fish The U.S. Environmental Protection Agency has compiled data about fish advisories issued throughout the country. The 1999 database shows widespread chemical contami- nation of U.S. lakes and rivers and widespread contamination of fish by POPs, especially PCBs. The EPA database includes the following POP and PCB contamination: State POPs-Related Advisories Advsories Involving PCBs (Number) (Percent) (Number) (Percent) California 69 64% 32 46% Illinois 61 95% 53 87% Indiana 944 58% 944 100% Massachusetts 133 46% 69 52% Michigan 523 73% 443 85% New York 309 86% 185 60% Ohio 109 74% 98 90% Pennsylvania 98 99% 85 87% Wisconsin 484 28% 477 99% Source: U.S. EPA, Office of Water, 1999. Listing of Fish and Wildlife Advisories.
  • 23. Nowhere to Hide 23 Persistent Toxic Chemicals Are Linked to a Variety of Health Problems The chemicals targeted by the global POPs treaty are associated with a long list of serious health problems, including cancer, neurological damage, birth defects, sterility and immune system defects (see Table 3 below). In the timeframe of widespread use of persistent toxic chemicals, various disease registries and sur- veillance efforts show increased incidence of breast cancer, learning disabilities and reproductive system damage. No one can say with certainty the extent to which exposure to POPs is responsible for these trends; we are exposed to a variety of pes- ticides and other chemicals in our daily lives that certainly contribute to these diseases. Nevertheless, the scientific studies used to compile Table 3, as well as many of those cited throughout this report, indicate that exposure to POPs is linked to numer- ous chronic illnesses and developmental disorders. Various U.S. and international agencies have estab- lished maximum POPs exposure levels, above which they have determined there is significant cause for concern about increased risk of both can- cer and non-cancer effects. While there are some differences in the thresholds established by differ- ent health and environmental agencies, the levels of exposure triggering concern about potential health damage are generally extremely low (see Appendix B). Unfortunately our food supply is contaminated with levels of these chemicals that result in exposures at or above the health-based standards. For four decades, scientists and health profession- als have warned us about the health effects of POPs on people and animals. That is the reason most of the POPs being considered in the global treaty have been banned in the United States and in a number of other countries for many years. Breast Cancer on the Rise. An estimated 2,044,000 women are living with breast cancer in the United States today (National Cancer Institute 2000). Of those, about 40,000 will die of the dis- ease this year (American Cancer Society 2000). In the year 2000, the incidence of newly diagnosed cases of invasive breast cancer is predicted to increase by four percent (American Cancer Society 2000). For ductal carcinoma in situ, or DCIS (a condition of abnormal cells in the milk ducts that is thought to be pre-cancerous), incidence rates rose 214 percent for women under age 50 between 1983–1997, and 329 percent for women older than age 50 (National Cancer Institute 2000). While there is a popular conception that breast can- cer is largely linked to genetic factors, environ- mental factors actually play a significant role (Lichtenstein 2000). Several studies have specifi- cally linked exposure to POPs pesticides to increased risk of breast cancer. PCBs and hexachlorobenzene, for example, have been linked to increased risk of breast cancer malignancy (Lil- jegren et al. 1998). Dieldrin exposure also has been linked with significantly elevated breast cancer risk (Davis et al. 1997, Hoyer et al. 1998). Learning Disabilities and Autism. Nearly 12 million American children, or 17 percent of all children in the U.S under age 18, suffer from learn- ing, developmental or behavioral disabilities (Cen- sus Bureau). Scientific research points to environmental toxicants, including some persistent toxic chemicals, as significant contributors to neu- rodevelopmental problems (Schettler et al. 2000). Developmental neurotoxicants are chemicals that cause harm to the developing brain of a fetus, and they include POPs like dioxins and PCBs (Schet- tler et al. 2000). Reduced intellectual performance has been measured in both children and monkeys exposed to PCBs in utero (Jacobson and Jacobson 1996, Rice 1999). In addition, the prevalence of autism has doubled in the past 30 years. California alone has seen a 210 percent increase in the number of children receiving services for autism (National Environ- mental Trust 2000). Autism incidence likely arises from a combination of genetic defects and expo- sure to toxic chemicals, according to the California Birth Defects Monitoring Program, which is run jointly by the state of California and the March of Dimes.
  • 24. Nowhere to Hide 24 Endocrine Disruption: Small Amounts of POPs, Serious Health Impacts. In the past decade, disturbing evidence has emerged that seri- ous damage can be caused by exposure to extraor- dinarily low levels of POPs. The reason for this lies in the ability of POPs to mimic human and animal hormones, including the male and female sex hor- mones responsible for the proper development of the fetus. These chemicals all are capable of cross- ing the placenta during gestation, and as a result, mixed messages are sent to the developing fetus. These hormonal messages are critically important to the developmental process, in which specialized organs and integrated reproductive, immune and Table 3. Health Effects of POPs Covered by Global Treatya Chemical Contaminant Health Effects Associated with Chemical Aldrin, Dieldrin, Endrin • Probable human carcinogen (aldrin, dieldrin) • Immune system suppression • Nervous system disorders • Reproductive damage • Liver damage • Birth defects: abnormal bone formation in animals (endrin) • Kidney damage • Suspected endocrine disruption • Developmental toxin (endrin) Chlordane and Heptachlor • Probable human carcinogen • Immune system suppression • Blood disorders • Liver damage • Central nervous system disorders • Suspected endocrine disruption • Developmental disorders (heptachlor) DDT, DDE • Probable human carcinogen • Reproductive failure in wildlife • Liver damage • Central nervous system disorders • Known endocrine disruption • Developmental disorders • Shortened lactation in nursing women Dioxins and Furans • Dioxin is a known human carcinogenb; Furans are possible carcinogens • Altered immune function • Central nervous system disorders • Chloracne and other skin disorders • Disrupts liver and kidney function • Reproductive effects: altered sex ratio, reduced fertility • Endometriosis • Known endocrine disruption • Developmental disorders, including birth defects Hexachlorobenzene • Probable human carcinogen • Disrupts hormone function • Damages liver, thyroid, kidneys, blood and immune system • Suspected endocrine disruption • Developmental toxin Mirex • Possible carcinogen in humans • Suppresses immune system • Suspected endocrine disruption • • Damages liver, stomach, kidneys, thyroid, nervous and reproductive systems Toxaphene • Probable carcinogen in humans • Reproductive/developmental effects • Suspected endocrine disruption • Damages lungs, kidneys, and nervous and immune systems PCBs • Probable human carcinogen • Chloracne and other skin disorders; Liver damage • Developmental disorders • Neurodevelopmental effects: reduced IQ and short term memory; spatial effects; hyperactivity • Endocrine disruption a. Sources: Agency for Toxic Substances and Disease Registry Toxicity Profiles, IARC 1997, Orris et al. 2000. b. IARC cancer rating is cited for dioxin; all other cancer ratings are from the U.S. EPA’s Integrated Risk Information Sys- tem or U.S. EPA Office of Pesticide Programs List of Chemicals Evaluated for Carcinogenic Potential, August 26, 1999.
  • 25. Nowhere to Hide 25 neurological systems are formed. Any disruption can cause permanent damage to these developing systems. The timing of chemical exposure to the developing fetus or infant is crucial. Because hormones are active at very low concentrations, even a tiny dose of an endocrine disruptor can have a profound effect if exposure occurs during critical times in the development of the fetus or infant. Because the development of different organ systems, the immune system and the nervous system occurs at different times during gestation and infancy, the vulnerability of various systems depends strongly on the timing of the dose. Humans are not the only victims of endocrine dis- ruption caused by POPs. The rapid decline in bird populations in the 1960s and 1970s caused by the POPs pesticide DDT was due to endocrine-disrupt- ing effects. Exposure of developing animals to these chemicals, in utero or in eggs, has been asso- ciated with feminization or demasculinization of male offspring or masculinization of female off- spring. In fish, endocrine disruptors interrupt nor- mal development and cause male fish to have female characteristics. These outward symptoms of developmental disruption are accompanied by reduced fertility and even sterility in adults, as well as lower hatch rates and viability of offspring (Goodbred et al. 1996). Disruption of the balance of endocrine hormones during development of young fish also can cause defects of the skeletal system, resulting in deformities and stunted growth (Ewing 1999). Fertility Problems: Endometriosis and Lower Sperm Counts. POPs also might be affecting our ability to conceive children. Recent studies demon- strate a correlation between exposure to POPs and the incidence of a variety of reproductive effects, including infertility (MacLusky et al. 1998, Edmunds et al. 2000, Grey et al. 1999, Ulrich et al. 2000). Some fertility problems are likely due to the endocrine-disrupting ability of these chemicals and include effects such as endometriosis in women and lowered sperm counts in men (Guo 2000). Mounting evidence links exposure to POPs and other chemicals to increased incidence of endometriosis in women. Endometriosis is a dis- ease in which the endometrial tissue normally found in the uterus migrates to other parts of the body. Infertility is a very common result as the dis- ease progresses, affecting 30 percent to 40 percent of women with the disease (Susag 1998; see also www.endometriosisassn.org). Endometriosis incidence has skyrocketed in recent years, and now affects at least 5.5 million Ameri- can women—about 15 percent of women of repro- ductive age. The percentage of women with endometriosis reporting symptoms before age 15 has jumped from 15 percent to 38 percent in the past 15 years. From 1965–1984 alone, hysterecto- mies for 15- to 24-year-old women due to endometriosis increased 250 percent, and 186 per- cent for 25- to 34-year-old women. One laboratory animal study directly correlated the incidence of endometriosis with dioxin exposure, with the severity of the disease dependent upon the dioxin administered (Susag 1998; see also www.endometriosisassn.org). Male fertility statistics also show troubling trends. In particular, male sperm density has significantly declined since the early years of the chemical age. Between 1938 and 1990, sperm density declined in the United States at a rate of 1.5 percent per year, while in Europe the numbers are 3 percent per year (Swan 2000). POPs Have Cumulative Effects. Many POPs exhibit similar modes of action on the human body, resulting in additive or even synergistic effects. In other words, the health effects resulting from expo- sure to multiple chemicals can be substantially greater than those resulting from exposure to a sin- gle chemical. The effects are especially pro- nounced on a developing fetus or infant (Vonier et al. 1996). The fact that additive and/or synergistic effects are common for POPs makes a strong case for banning the use of the entire class of chemicals, not just a few of the worst offenders.
  • 26. Nowhere to Hide 26 CONCLUSION AND RECOMMENDATIONS This study shows the ubiquitous presence of per- sistent toxic chemicals in the U.S. food supply despite the fact that most of these pesticides have been banned for use in this country for many years. Highly toxic persistent toxic chemicals are found in food as a result of their use abroad and their release by domestic manufacturing processes and waste incineration, as well as residues of historical use in this country. As long as POPs continue to be produced and used anywhere, they will continue to contaminate the U.S. food supply and threaten the health of American consumers. There is little that can be done to immediately reduce the level of persistent toxic chemical levels in food. In some cases, heavy concentrations in soil and water can be cleaned up, and cropping choices can be made to avoid cultivation of certain crops in POPs-contaminated agricultural lands. Given enough years, even these persistent chemicals will break down into harmless compounds. A combina- tion of the passage of time, prevention of addi- tional POPs accumulations, and clean up of POPs in our soil and waterways can lay the groundwork for a virtually POPs-free world for future genera- tions of Americans. From a health-protection standpoint, the evidence strongly indicates that American consumers would be served best by a implementaton of the precau- tionary principle to prevent additional accumula- tion of POPs in our air, water and soil. Given the serious health risks associated with even extremely small levels of exposure to POPs, prevention of further food contamination must be made a national health policy priority. The global POPs treaty offers the most promising vehicle for preventing further accumulation of per- sistent toxic chemicals in food and giving future generations the chance they deserve to experience life free from harm from persistent toxic chemi- cals. Early and effective implementation of the treaty should be an urgent priority for the current U.S. Administration.
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