Now a days, use of pesticides i.e. DDT, BHC, Aldrin, Dialdrin etc are increasing. Similarly, chemical fertilizers are also being using too much. these chemicals mixed with rain water flows towards the water sources and pollute them.
Farms discharge large quantities of agrochemicals, organic matter, drug residues, sediments and saline drainage into water bodies. Agriculture intensification is often accompanied by increased soil erosion, salinity and sediment loads in water and excessive use of fertilizers to increase productivity. Pollution caused by agriculture can contaminate water, food, fodder, farms and the natural environment of the atmosphere.