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  • More than 100 million people in the United States, or about 35 percent of the population, receive their drinking water from public groundwater systems, which can be vulnerable to naturally occurring contaminants such as radon, uranium and arsenic, as well as manmade compounds, including fertilizers, septic-tank leachate, solvents and gasoline hydrocarbons. 00:51 (Video of drilling, photos of sampl
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