water pollution is contamination of natural area because of factory wastewater, civilized society .it became faster when industrialization , urbanization start . and now, the biggest factor of water pollution is domestic wastewater ,and then industrial wastes and livestock wasewater follow it.
eutrophication is situation that too many organic matter ,phosphates,nitrogen compounds in the water to purify . it make water green , rot bottom of water . it means eutrophication makes dead water . so fishes is hard to live and in using to farming, it demages the crops.
Of course, river pollution from urban domestic sewage is worse than rurals industrial sewage leads disease from various heavy metal.
especially, sewage included heavy metal is finally return to environment through the bio magnification process.
among the fertilizer and agricultural chemicals remained compounds are absorbed to organism and pollute soil like heavy metal
finally , it accumulates inside the organism and brings chronic poisoning.
water pollution for the early stage of industrial effects something bad , not only to people but also environment. all environmental pollution is linked. and all demage to environment as well as water pollution.thus , we have to individual effort not only environmetal policy of government for prevent ecosystem destroy caused by water pollution