How many people in the United States depend on ground water for drinking?
About 42,400,000 people (accounting for about 3,350 million gallons per day) are served through domestic supply; and about 91,200,000 people (accounting for about 15,100 million gallons per day) are served through public-water supply (Solley, W.B., Pierce, R.R., and Perlman, H.A., 1998, Estimated Use of Water in the United States in 1995, U.S. Geological Survey Circular 1200).
