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 and public water systems (PWSs) provide these monitoring results to their served customers to comply with Consumer Confidence Report requirements.

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)

EPA gives states primary responsibility for applying Safe Drinking Water Act (SDWA) 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.