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Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Laboratory Certification

Laboratories that analyze samples of drinking water are required by EPA to be certified by an approved certifying authority. EPA Region 9 laboratory personnel who are trained as laboratory certification officers conduct on-site evaluations of laboratories operated by states, Indian tribes and Pacific Island communities.

The laboratory certification officers also audit the states' certification program to ensure that all laboratories analyzing drinking water samples are following approved methods as mandated by EPA's National Primary Drinking Water Regulations. Ultimately, this ensures the public that their drinking water is free from harmful contaminants.

Although the certifying authority for private and municipal laboratories lies with the states, the Region 9 laboratory certifying officers are always available to provide technical assistance whenever needed. Contact Region 9 Lab staff for more information.

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