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Unregulated Contaminant Monitoring Rule

What is the Unregulated Contaminant Monitoring Rule?

The Unregulated Contaminant Monitoring Rule (UCMR) provides EPA and other interested parties with scientifically valid data on the occurrence of contaminants suspected to be present in drinking water, but that do not have health-based standards set under the Safe Drinking Water Act (SDWA). The data serves as a primary source of occurrence and exposure information that EPA uses to develop regulatory decisions. The final rule “Revisions to the Unregulated Contaminant Monitoring Rule (UCMR3) for Public Water Systems” was published in the Federal Register on May 2, 2012. The UCMR 3 contaminant list includes 28 chemicals and two viruses. The Florida Department of Environmental Protection and Department of Health will not be involved in the implementation of this rule, therefore Florida water systems will deal directly with US EPA Region IV.

Who Will Be Required to Monitor?

Participation is based on retail population served for community water systems and non-transient non-community water systems. Screening Survey monitoring will be conducted by all systems serving more than 100,000 people; 320 randomly selected systems serving 10,001 to 100,000; and 480 randomly selected systems serving 10,000 or fewer.

When Will Systems Be Required to Monitor?

Participating systems will be required to monitor for one consecutive 12-month period during January 2013 – December 2015 (monitoring can span more than one calendar year, as long as conducted during a consecutive 12-month period).

Additional Information

Last updated: September 30, 2014

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