List of Laboratories Approved by EPA for the Fourth Unregulated Contaminant Monitoring Rule (UCMR 4)
EPA's UCMR 4 Laboratory Approval Program exclusively applied to laboratories analyzing samples from the UCMR 4 cycle. The list of UCMR 4 labs 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 4 laboratory. Stakeholders interested in finding a UCMR 5 qualified laboratory should not use this UCMR 4 table as a reference but should instead refer to UCMR 5.
This document provides a list of laboratories that met the fourth Unregulated Contaminant Monitoring Rule (UCMR 4) laboratory approval program application and proficiency testing criteria for the methods indicated.