Contact Information for Certification Programs and Certified Laboratories for Drinking Water

State-certified laboratories regularly test drinking water samples for compliance with National Primary Drinking Water Regulations.

EPA is unable to test your drinking water upon request. We recommend using a state-certified laboratory if you choose to test your drinking water.

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) (147.84 KB, March 2023, 815-B-23-004)

EPA gives states primary responsibility for applying safe drinking water standards that public water systems must follow. Public water systems use state-certified laboratories to regularly test drinking water samples using methods evaluated and approved by EPA.

• Primary Enforcement Responsibility
• Information About Public Water Systems
• National Primary Drinking Water Regulations
• Approved Methods for Testing Drinking Water Samples
• Drinking Water Data

If your household is supplied by a private drinking water well, rather than a public water system, you may contact your state program for guidance or directly contact a certified laboratory to pay to have your private well tested.

• Private Drinking Water Well Information and Guidance

EPA approves laboratories to test samples for the Unregulated Contaminant Monitoring Rule.