U.S. Department of the Interior
Published: 2014-07-23
Total Pages: 132
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Arizona is located in an arid to semiarid region in the southwestern United States and is one of the fastest growing States in the country. Population in Arizona surpassed 6.5 million people in 2008, an increase of 140 percent since 1980, when the last regional U.S. Geological Survey groundwater study was done as part of the Regional Aquifer System analysis program.