What are the main causes of water pollution ? How can it be controlled ?

Main causes of water pollution are:

• Chemical waste, industrial waste and agricultural processes.

• Thermal waste from nuclear and thermal power plants.

• Sewage and garbage.

Prevention of water pollution:

• Domestic sewage should be treated before being discharged into rivers.

• Using of non-biodegradable substances like detergents should be stopped.

• Trees and plants must be planted along the banks of rivers.

• Purification of water bodies should be carried out.

• The waste products of industries should be treated before they are discharged into rivers.