Monitoring Unregulated Contaminants in Drinking Water

The Safe Drinking Water Act requires that the EPA establish requirements for public water systems (PWSs) to monitor for priority unregulated contaminants every five years and requires the agency to make the results publicly available.

• Learn about the Unregulated Contaminant Monitoring Rule (UCMR)
• Meetings and Materials
• Reporting Requirements

• UCMR 5 (2022-2026)
• UCMR 4 (2017-2021)
• UCMR 3 (2012-2016)
• UCMR 2 (2007-2011)
• UCMR 1 (2001-2005)
• UCM-State Rounds 1&2 (1988-1997)

• UCMR 5 Laboratory Approval Program
• EPA Approved Laboratories for UCMR 5
• EPA Approved Laboratories for UCMR 3 and UCMR 4

• Contaminant Candidate List (CCL) and Regulatory Determination
• National Contaminant Occurrence Database
• EPA Ground Water and Drinking Water Website