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United States Environmental Protection Agency
Unregulated Contaminant Monitoring Rule 1 (UCMR 1)
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The UCMR Monitoring List includes thirty-five contaminants which were identified as occurrence priorities on the Contaminant Candidate List, and two radionuclides that emerged during regulation development.

The UCMR Monitoring List is comprised of three separate lists based on analytical methods readiness and current contaminant occurrence data:


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