Ground water generally comes from built up precipitation; melted snow and rain. Aquifers, for example, are the result of millions of years of such build-up.
Natural surface percolation allows melting snow and rain water (as well as river and stream water) to enter the ground and suffuse into large under ground basins. The water can be stored there for millions of years, building into a vast underground reservoir. When these aquifers are tapped, ideally the same natural water systems that established them will help replenish them. This is not always the case however, especially if the aquifer is being over pumped.
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