An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Monitoring Unregulated Drinking Water Contaminants

List of Laboratories Approved by EPA for the Third Unregulated Contaminant Monitoring Rule (UCMR 3)

EPA's UCMR 3 Laboratory Approval Program ended in December 2016, coinciding with the end of the UCMR 3 cycle. The list of UCMR 3 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 3 laboratory.  Stakeholders interested in finding a UCMR 4 qualified laboratory should not use this table as a reference, but rather review the current list of EPA approved laboratories for UCMR 4.

This document provides a list of laboratories that met the third Unregulated Contaminant Monitoring Rule (UCMR 3) laboratory approval program application and proficiency testing criteria for the methods indicated.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.