the water beneath the surface of the ground, consisting largely of surface water that has seeped down: the source of water in springs and wells.
underground water that has come mainly from the seepage of surface water and is held in pervious rocks
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Boreholes also don't work in areas where there has been moving ground water during the past few centuries.
Even ground water used for drinking water is not free from viruses.
And unlike other herbicides that wind up in ground water, glyphosate stays where it's sprayed, degrading within weeks.
Or that you can contain ground water and aquifer contamination.
Arsenic in ground water is caused naturally mainly by minerals dissolving from weathered rocks and soils.
The heavy metals, including uranium in coal ash, stay around to leach into ground water for ever.
Using temperature to study stream-ground water exchanges.