Unregulated Contaminant Monitoring Rule 3 (UCMR 3)
The final rule "Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 3) for Public Water Systems" was published in the Federal Register on May 2, 2012. UCMR 3 monitoring will take place from 2013-2015, and includes monitoring for 28 chemicals and two viruses. Additional information can be found in the UCMR 3 General Fact Sheet or at EPA's Water: Unregulated Contaminant Monitoring Rule 3 page.
Under UCMR 3, public water systems or EPA will conduct sampling and analysis for Assessment Monitoring (List 1), Screening Survey (List 2), and Pre-Screen Testing (List 3) contaminants, as follows:
Assessment Monitoring (List 1 Contaminants) uses common analytical method technologies used by drinking water laboratories. For UCMR 3, all PWSs serving more than 10,000 people and 800 representative PWSs serving 10,000 or fewer people will monitor for 21 List 1 contaminants during a 12-month period from January 2013 through December 2015.
Screening Survey (List 2 Contaminants) monitoring uses specialized analytical method technologies not as commonly used by drinking water laboratories. All PWSs serving more than 100,000 people, 320 representative PWSs serving 10,001 to100,000 people, and 480 representative PWSs serving 10,000 or fewer people are required to monitor for seven List 2 contaminants during a 12-month period from January 2013 through December 2015.
Pre-Screen Testing (List 3 Contaminants) uses newer method technologies not as commonly used by drinking water laboratories. For UCMR 3, EPA will select 800 representative PWSs serving 1,000 or fewer people that do not disinfect. These PWSs with wells that are located in areas of karst or fractured bedrock, will participate in monitoring for two List 3 viruses during a 12-month period from January 2013 through December 2015.
For systems serving 10,000 or fewer people, EPA will supply your system with sampling kits and instructions for their use, and will pay for the cost of shipping the samples to an EPA-designated laboratory as well as the cost of analysis.
EPA has just released its initial list of laboratories that are approved to analyze the contaminants required to be tested under the third Unregulated Contaminant Monitoring Rule (UCMR3). The listed laboratories met UCMR 3 Laboratory Approval Program application and Proficiency Testing criteria for the methods. The approval covers both List 1 Assessment Monitoring and List 2 Screening Survey contaminants. Public water systems are responsible for their laboratories, and must ensure they are following the methods and meeting the quality control (QC) criteria specified in UCMR 3. Laboratories must post sample analytical results and required QC data electronically via the Safe Drinking Water Accession and Review System (SDWARS) within 120 days of sample collection.