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### Theory:

The contamination of water bodies by human activity is known as Water pollution.
When harmful substances such as chemicals, sewage and waste are dumped into water bodies, contamination occurs. It changes water's physical, chemical and biological properties. It contaminates water and makes it harmful to living beings. Drinking polluted water is dangerous to one's health.
There are $$17$$ major river basins in Tamil Nadu, with $$61$$ reservoirs and roughly $$41,948$$ tanks. In Tamil Nadu, lakes and tanks have been employed to collect rainwater during the monsoon and store it for later use. Groundwater sources are called Aquifers.