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The Unregulated Contaminant Monitoring Regulation supporting the second cycle (UCMR 2) of monitoring was signed on December 20, 2006. The UCMR 2 requires monitoring for 25 contaminants using five analytical methods during 2008-2010. Together EPA, the States, laboratories and public water systems (PWSs) are participating in UCMR 2.

Federal Register Notice: Revisions to the Unregulated Contaminant Monitoring Regulation (UCMR) for Public Water Systems

Similarly to UCMR 1, UCMR 2 includes both Assessment and Screening Survey monitoring. Additionally, EPA is coordinating a laboratory approval program for the selected contaminants.

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