Water Quality Standards According to Baeuro of Indian Standards and World Health Organization

1. SPECIFICATIONS OF DRINKING WATER
BY BIS & WHO
Asst. Prof.-BANKAR P.R.

2.  Water quality standards
 Importance of setting standards
 Variations in standards from country to country
 Differentiate between acceptable and permissible
limits of water standards
 WHO Standards
 BIS Standards
 Comparative analysis between BIS & WHO

3. Drinking Water Quality Standards-
 Characterise maximum level for the concentration
of a substance in water which will have no
significant risk to health over a lifetime of
consumption.
 The primary goal of Water quality standards is to
protect public health
 It consists physical, biological and chemical water
qualities.
Requirements of drinking water quality standards
Test methods
Sampling procedure
Quality parameters

4. Water quality standards can be
Numeric – maximum permitted pollutant concentration
level in a water.
Narrative – criteria for desired conditions of a water.

5. Variations in drinking water standards-
 There are no universally recognised and accepted international
standards for drinking water, It vary country to country by
considering public need, practical attainability & local conditions.
 The standards are set for the human consumption, industrial
use, environmental health and to maintain this the standards
agencies plays an important role to set the standard value for
each parameter.
 To help them environmental scientists work to understand what
are the fates of contamination, also environmental lawyers and
policymakers work to define legislation with the intension that
water is maintained at an appropriate quality for its identified
use.

6.  Many developed countries specify standards to be applied their
own country.
o Europe – European Drinking Water Directive
o U.S. – United States Environmental Protecting Agency (EPA)
establishes standards as required by Safe Drinking Water Act.
o China- Drinking water standard GB3838-2002 by Ministry of
Environmental Protection.
o INDIA – Baeuro of Indian Standards (BIS IS-10500)
o WHO -
WHO has continually produced guidance on the management of
drinking-water quality since 1958 when it published the
International standards for drinking water. (revised in 1963 & 1971).
In 1984, the international standards for drinking water were
replaced with 1st edition of the GDWQ. ( SUBSEQUENT
1993,2004,2011)

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8. Standard setting process
Stage 1: The scientific or risk assessment stage-
 Hazard Identification (to determine whether an
agent can cause an adverse effect in humans)
 Dose-response assessment (determination of the
quantitative relationship between the dose and its
advesrse health effects)
 Exposure assessment (estimation of the level of
an agent to which various individuals or
populations are exposed)
 Risk characterisation ( estimation of the incidence
and severity of the adverse effects that are liable
to occur in a population due to actual or
predictable exposure)

9. Stage 2: The political and administrative stage
 Determination of acceptable risk
 Determination of public to be protected
 Choice of control technology
 Legislation/standards
 Economics
Priorities of the BIS
1. Accessibility of water supply to consumers
2. Control the microbiological qualities of water
supply
3. Control the toxic chemicals in water supply
4. Essthatis – no colour, no odour, no taste

10. BIS Parameters-
• Physical
• General
• Pesticide residues
• Toxic
• Radioactive
• Bacteriological
• Virological
• Biological examination
 Desirable limits – Desirable limits means the amount of
specific element upto which that particular element can be
present in water and beyond that level is not good for
drinking. This limit needs to be implemented.
 Permissible limits – for that particular element is the
amount upto which water can be consumed provided there

24. Virological examination
• Drinking water should be free from viral infection.
• MS2 phage is indicator of viral contamination in water, If
detected ; virological examination shall be done by the
PCR method.
• > 0.5 mg/l of free chlorine for one hour is sufficient to
inactivate virus, even in water that was originally polluted.
• A redox potential of 650 mV cause almost inactivation of
high concentration of virus.

25. Biological Examination –
Water should be free from algae, zooplanktons, flagellates,
parasites and toxin producing organisms.
• Chlorination
• Filtration
• Flocculation
• Microscopic examination

27. THANK YOU