Unregulated Contaminant Monitoring Rule 2 (UCMR 2), (2008-2010) Occurrence Data
The Unregulated Contaminant Monitoring Rule supporting the second cycle (UCMR 2) of monitoring, conducted under EPA oversight, was published in the Federal Register on January 4, 2007. The UCMR 2 required monitoring for 25 contaminants using five analytical methods.