The third Unregulated Contaminant Monitoring Rule (UCMR 3) was signed by EPA Administrator, Lisa P. Jackson on April 16, 2012. As finalized, UCMR 3 will require monitoring for 30 contaminants using EPA and/or consensus organization analytical methods during 2013-2015. Together EPA, States, laboratories and public water systems (PWSs) will participate in UCMR 3.