How pollution affect water supply?

(Need for 7class)

As ground water works its way through the soil, it can pick up excess nutrients and transport them to the water table. When polluted groundwater reaches drinking water systems it can pose serious public health threats. Nutrient pollution can affect vital ground water and drinking water sources.

Explanation:

Water pollution happens when toxic substances enter water bodies such as lakes, rivers, oceans and so on, getting dissolved in them, lying suspended in the water or depositing on the bed. This degrades the quality of water.