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The quality and quantity of ground water can affect the health and well-being of citizens who depend upon ground water for drinking-water supply, as well as have important consequences to the economic well being of a community. For many Americans, ground water is the primary source of drinking water. It also replenishes our streams and rivers, and provides freshwater for irrigation and industry. An aquifer is a geologic formation, a group of formations, or part of a formation that contains sufficient saturated permeable material to yield substantial quantities of water to wells and springs. Currently 16 of the Nation’s 62 principal aquifers are being studied by the NAWQA Program. In aggregate, these 16 principal aquifers accounted for about three quarters of the estimated withdrawals for drinking-water supply in 1990 from the Nation’s 62 principal aquifers. The METX principal aquifer was ranked 9th (with 1st being the largest use) of the 62 principal aquifers for 1990 estimated drinking-water use.

U.S. Geological Survey studies quality of drinking-water supplies in the Mississippi Embayment-Texas Coastal Uplands principal aquifer