How does groundwater become polluted?

Explanation:

The groundwater is a reservoir of water accumulates at the undersurface of the earth. The water get seep inside the undersurface through the tiny pores present in the soil and rocks. The source of groundwater includes water from melting glaciers, rainfall, surface runoff, rivers, lakes and ponds.

The contamination of the groundwater occurs due to mixing of the chemical products such as gasoline, road salts, oils. The mining process for the excavation of minerals also add up concrete, soil and sediments to the groundwater. The surface runoff of agriculture field add up fertilizers and pesticides to the groundwater. The water from the septic drainage system adds up sewage water to the groundwater.