Groundwater quality can be affected by chemicals and pollutants filtering through the soil, as well as structural failure if too much water is pulled out without being replenished. Chemicals and pollutants that find their way into runoff and stormwater can be carried via the water into underground stores. This can come from industrial waste, household chemicals, agricultural runoff, and more.
Groundwater is typically more filtered than most surface water, as its had the chance to filter through layers of sediments like sand and gravel. The majority of groundwater is fresh, and used for drinking water all over the world.
