Water pollution is caused by both point sources, such as factories and sewage systems that directly pollute water, and non-point sources, like runoff from farms and roads that carry pollutants into water sources. Many harmful substances contribute to water pollution, including carcinogenic compounds from industrial waste that contaminate groundwater and affect human health. Responsibility for water pollution is widespread as it stems from direct discharges as well as runoff and airborne deposition from various sources.

1. (( Water pollution ))
To figure out the meaning of water pollution , it is better
to understand the basic concept of pollution.
Pollution is the introduction of harmful substances or
products into the environment , and has many types
,which the main is water pollution .It is categorized into
two to different groups ,the first one is point sources
which are easy to identify and control such as factories ,
sewage system ,power plants ,and oil wells , they are
direct sources of water pollution and can be reduced .
and the second is non-point sources which are
ambiguously defined and harder to control such us rain
or snow moves through the ground and picks up
pollutants as it moves towards a major body of water ,
the runoff fertilizers from farm animals and crop land
,and air pollutants getting washed or deposited to earth.
There are many chemicals which are responsible to water
pollution The 20 most abundant compounds in
groundwater at industrial waste disposal sites include
TCE, benzene, vinyl chloride...all are carcinogens, and also
affect liver, brain, and nervous system Polychlorinated
biphenyls Byproducts of plastic, lubricant, rubber & Paper
Industry .also anyone is responsible of water pollution.