water pollution

What pollution water, where do the pollutions come from, and what effects do they have?
What are the major water pollution problems of streams and lakes?
What causes groundwater pollution, and how can it be prevented?
What are the major water pollution problems of oceans?
How can we prevent and reduce surface water pollution?
How safe is drinking water, and how can it be made safer?


Agriculture- Sediment eroded from agricultural lands and overgrazed rangeland is the largest source.- Fertilizers, pesticides, bacteria from livestock and food processing wastes, and excess salt from soils of irrigated cropland.
Industry and Mining- Acidic compounds draining from active and abandoned subsurface and surface mines into streams can kill fish and other aquatic life.


Most of the 209 different PCBs are insoluble in water, soluble in fats, and resistant to biological and chemical degradation-properties that result in their accumulation in the tissues of organisms and their biological amplification in food chains and webs.