-= Causes of water pollution =-

Water pollution is usually caused by the discharge of the following

wastes and soil into rivers and sea.

Domestic wastes

Agricultural wastes

Industrial wastes

Excessive silt

-= Domestic wastes =-

include human sewage , refuse and deregents.

-= Agricultural wastes =-

include manure of poultry and pigs , pesticides and

excessive fertilizers.

-= Industrial wastes =-

include organic matter , detegents , poisonous chemicals ,

hot water , oil and suspended particles.

-= Excessive silt =-

from erosion of the watersheds caused by improper control

of soil during aricoltural practice , overgrazing , mining and

timbering.