Water PollutionWater Pollution is
the addition of any substance that has a negative effect on water or the living things that depend on water.
Point Source Pollution Sources of pollution are
classified, in part, by how they enter a body of water.
Point source pollution is a specific source of pollution that can be identified.
Example: A pipe gushing colored water into a river
Non-Point Source Pollution
A widely spread source of pollution that can’t be tied to a specific point of origin is called nonpoint source pollution.
Example: Runoff from a farm field, a street, or a construction site
Three major sources of water pollution are:
1. Human Wastes2. Industrial Wastes
3. Chemical Runoff
Human Waste Sewage in cities
During heavy rains or floods, sanitary sewers sometimes overflow and can pollute the surface water.
If this happens, people are often told to boil water for drinking and cooking after a flood.
Sewage in Rural AreasWastes from cattle, pigs, and chickens can
also be a problem in rural areas. Animal wastes can run off from pastures
and barnyards and pass disease-causing bacteria and other kinds of pollution into bodies of water.
Industrial WastesChemicals, smoke , and heated water are three types of pollutants produced by factories, mines, and other industries.
Chemical RunoffMany factory processes
involve toxic chemicals and strong acids.
Other toxic wastes are produced as a result of manufacturing and mining processes.
Although laws control many point sources of chemical pollution, some factories still release toxic chemicals directly into nearby rivers and lakes.
Hazards To Humans• Humans are affected by
water pollution . • People can get diseases such
as hepatitis by eating seafood that has been poisoned. • In many poor nations, there is
always outbreak of cholera and diseases as a result of poor drinking water treatment from contaminated waters.
“Every year, more people die from the consequences of unsafe water
than from all forms of violence, including war”
Water Pollution SolutionsSolving pollution problems involves cleaning
up existing problems as well as preventing new ones. Cleanup
oMany pollutants are removed from fresh water through natural cleanup processes.
oLiving things in lakes, streams, and wetlands help reduce pollution by filtering out and breaking down waste materials.