US counties with worst drinking water violations concentrated in 4 states: West Virginia, Pennsylvania, North Carolina and Oklahoma, finds study. About 2 million people nationwide do not have running water. Another 30 million people are reliant on drinking water systems that violate safety rules.

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3. US counties with worst drinking water violations concentrated in 4 states: West Virginia, Pennsylvania, North Carolina and Oklahoma, finds study. About 2 million people nationwide do not have running water. Another 30 million people are reliant on drinking water systems that violate safety rules.