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Water: Laboratory Certification

Drinking Water Analytical Methods

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Water systems must use EPA-approved analytical methods when analyzing samples to meet federal monitoring requirements or to demonstrate compliance with drinking water regulations. Approved methods are listed in the Code of Federal Regulations after publication in a final rule or as part of an expedited approval. Approved methods are developed by EPA, other government agencies, universities, consensus methods organizations, water laboratories, and instrument manufacturers.

Analytical Methods Approved for Drinking Water Compliance Monitoring

The following documents list all of the methods that are currently approved by EPA for the analysis of drinking water samples. Each document focuses on the methods that are applicable to a specific monitoring requirement. When a method can be obtained by direct download from the Internet, the report identifies the link. EPA will update these tables periodically. 

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Sources of Drinking Water Methods


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Technical Notes on Drinking Water Methods

In October 1994, Technical Notes on Drinking Water Methods (EPA/600/R-94/173) was published as a joint effort of the Office of Water and the Office of Research and Development. This publication was prepared to add modifications, clarifications, options or improvements to methods that had previously been approved and published. EPA elected to describe these changes in this document and thereby allow the public to use these changes more immediately. This document is available through EPA’s National Service Center for Environmental Publications (NSCEP).

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