2Water PollutionWater Pollution is the addition of any substance that has a negative effect on water or the living things that depend on water.
3Point 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
4Non-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
6Three major sources of water pollution are: 1. Human Wastes2. Industrial Wastes3. Chemical Runoff
7Human 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.
8Sewage 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.
9Industrial WastesChemicals, smoke , and heated water are three types of pollutants produced by factories, mines, and other industries.
10Chemical 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.
12Hazards 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.
13If it continues then no more drinking water will be on earth in next 40 or 50 years
14“Every year, more people die from the consequences of unsafe water than from all forms of violence, including war”
15Water Pollution Solutions Solving pollution problems involves cleaning up existing problems as well as preventing new ones.CleanupMany pollutants are removed from fresh water through natural cleanup processes.Living things in lakes, streams, and wetlands help reduce pollution by filtering out and breaking down waste materials.