Frequent Questions

The Unregulated Contaminant Monitoring Regulation (UCMR) 1 Monitoring Program was comprised of three separate lists of contaminants. Is there a Pre-Screen Testing List (List 3) of contaminants under UCMR 2?

Pre-Screen Testing, the third tier of UCMR monitoring that is designed for priority "List 3" contaminants, is not required under UCMR 2. EPA retained the regulatory language that supports Pre-Screen Testing authority as part of the three-tiered UCMR framework. If EPA decides to include Pre-Screen Testing, EPA will initiate a rulemaking action to propose List 3 contaminants and their associated analytical methods (72 FR 368, 371; January 4, 2007).
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