What portion of public water system customers in the U.S. are served by facilities that had no reported violations of the EPA's health-based drinking water standards during 2013?
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Federal law requires that public water systems be tested for various contaminants and treated (if needed) to meet these standards. In 2013, 92% of public water system customers were served by facilities that had no reported violations of the EPA's health-based drinking water standards. A caveat of this finding is that violations are reported by states, and the EPA has found cases in which violations were not reported.
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