Water that collects or flows beneath the Earth's surface, filling the porous spaces in soil, sediment, and rocks. Groundwater originates from rain and from melting snow and ice and is the source of water for aquifers, springs, and wells. The upper surface of groundwater is the water table .
The definition of groundwater, or ground water, is water located beneath the surface of the earth.
The water that your well draws from under the ground is an example of groundwater.