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Quality of Water from Public Wells in the United States

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Figure 6. Ten contaminants, including seven from natural sources and three from primarily man-made sources, each were detected at concentrations greater than human-health benchmarks in at least 1 percent of source-water samples from public wells. Radium, arsenic, gross alpha-particle radioactivity, nitrate, and perchloroethene are regulated in drinking water under the Safe Drinking Water Act.

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/nawqa/studies/public_wells/top_ten.html
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Page Last Modified: Wednesday, 09-Jan-2013 12:12:28 EST