Unregulated Contaminant Monitoring Rule 3 (UCMR 3), (2013-2015) Occurrence Data
The third Unregulated Contaminant Monitoring Rule (UCMR 3), conducted under EPA oversight, was published in the Federal Register on May 2, 2012. UCMR 3 requires monitoring for 30 contaminants: 28 chemicals and 2 viruses.