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  • usiness:2010/05/21: USGS: Contaminants in Groundwater Used for Public SupplyMore than 20 percent of untreated water samples from 932 public wells across the nation contained at least one contaminant at levels of potential health concern, according to a new study by the U.S. Geological Survey.[???]Findings showed that naturally occurring contaminants, such as radon and arsenic, accounted for about
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