There are two kinds of water pollution:
     Organic 
     Industrial

Organic includes waste materials such as human and animal excretions and discarded parts of harvested crops 
and Industrial includes synthetic chemicals and heavy mateal which are usually toxic.
HUMAN IMPACT:
     Humans cause almost all of water pollution, this is caused by using excess fertilizers, sewage, oil 
and others.

FERTILIZERS-
     The overuse of fertilizers disposed into water bodies cause over growth of algae and leave bo oxygen 
for plants and animals to live.

SEWAGE-
     From municipal wastewater systems and septic tanks, the sewage in water can cause serious illness to 
both the people drinking it and the organisms living in it.

OIL- 
     At least 1 percent of the world's oil production ends up in the ocean through oil spills. For example
in 1989 Exxon Valdez spilled 11 million gallons of oil in Alaska's Prince William Sound killing thousands 
of organisms that lived in or near the sound. That is the kind of damage that the sound will never fully
recover from.

OTHER POLLUTANTS-
     Pesticides, bioaccumulative chemical compounds, and garbage are some other contributers to the human
impact on water pollution.