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U.S. EPA Research and Monitoring for Unregulated Contaminants in Drinking Water

The U.S. EPA’s Unregulated Contaminant Monitoring Rule (UCMR) requires all public drinking water systems serving at least 10,000 people and a random subset of smaller public systems to periodically monitor for selected contaminants of emerging concern (CECs). Some of these CECs affect source water quality and drinking water treatment needs.