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Contact Us About Certification of Laboratories for Drinking Water

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Mailing Address:
EPA Office of Ground Water and Drinking Water
1200 Pennsylvania Ave, N.W.
Mail Code 4606M
Washington, DC 20460

Individuals interested in independently having their drinking water tested are encouraged to contact a state-certified drinking water laboratory. Unfortunately, EPA is unable to test residential or commercial drinking water upon request.

Find a certified laboratory in your state by using this PDF containing links to your state’s laboratory certification program:

  • State Certification Programs Certify Laboratories to Conduct Drinking Water Analyses, 40 CFR 142.10(b)(3) (pdf) (239.78 KB, January 2025)

Certification of Laboratories for Drinking Water

  • Learn About Laboratory Certification
  • Laboratory Certification Manual
  • Contact Information for Certification Programs and Certified Laboratories
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 12, 2025
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