1. Many times water is polluted due to the excessive use of fertilizers and pesticides or poor: drainage.
2. Sometimes the water is polluted by animals and human beings.
3. Even the ashes of the dead persons and dead animals are thrown into rivers.
4. In villages, people wash their clothes on the banks of rivers and bathe their cattle there.
5. Sometimes the water is polluted by chemicals released from industries and factories reached of the rivers through the drainage system.
