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Monitoring Unregulated Drinking Water Contaminants
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List of Laboratories Approved by EPA for the Third and Fourth Unregulated Contaminant Monitoring Rule (UCMR 3 and UCMR 4)

EPA's UCMR 3 and UCMR 4 Laboratory Approval Programs ended in December 2016 and December 2021, respectively, coinciding with the end of the UCMR 3 and UCMR 4 cycles. The list of UCMR 3 and UCMR 4 laboratories will remain posted for the foreseeable future to exclusively serve as a reference for interested stakeholders seeking the analytical services of a previously approved UCMR 3 or UCMR 4 laboratory. Stakeholders interested in finding a UCMR 5 qualified laboratory should refer to UCMR 5.

The following documents identify laboratories that were approved to support monitoring under the third and fourth Unregulated Contaminant Monitoring Rules (UCMR 3 and UCMR 4).

  • EPA Approved Laboratories for UCMR 3 (pdf) (211.26 KB, October 2016, 815-B-16-025)
  • EPA Approved Laboratories for UCMR 4 (pdf) (844.65 KB, January 2018, 810-B-18-001)
  • Monitoring Unregulated Drinking Water Contaminants Home
  • About the Unregulated Contaminant Monitoring Rule (UCMR)
  • Meetings & Materials
  • Laboratory Approval Program
  • Occurrence Data
  • Reporting Requirements
  • UCMR 5
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Last updated on February 17, 2023
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