When organic and inorganic waste from industries get discharged into the rivers, it results in water pollution. The industries that increase water pollution are paper, pulp, chemical, Textiles and dyeing, petroleum refineries, tanneries and electroplating industries. They discharge untreated wastes into a waterbody which eventually hampers the ecological balance of the region.

When the hot water from the plants, factories are drained into rivers and water bodies before cooling down, it has an ill effect upon the aquatic life.