National Water-Quality Assessment (NAWQA) Program

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Quality of Water from Domestic Wells in the United States

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Concentrations of arsenic were greater than the U.S. Environmental Protection Agency Maximum Contaminant Level of 10 micrograms per liter in about 7 percent of wells nationally and were found at these concentrations in wells from several aquifer types. >, greater than; >, greater than or equal to; <, less than or equal to; <, less than.

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URL: http://water.usgs.gov/nawqa/studies/domestic_wells/arsenic.html
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Page Last Modified: Wednesday, 09-Jan-2013 12:12:37 EST