Final version of EPA 1633A Released

Eurofins’ labs are fully operational and ready to support the latest version of 1633A.

The U.S. EPA, in collaboration with the Department of Defense, has finalized a method for the measurement of 40 PFAS in non-potable water, soils, biosolids, landfill leachate, and fish tissue via LC-MS/MS. This method has been multi-lab validated and developed in accordance with the required quality assurance and control procedures specified for EPA Clean Water Act methods in the Code of Federal Regulations (CFR).

The final version of EPA 1633A was released by the U.S. EPA on December 5, 2024 and published for public comment in the CFR as part of a Methods Update Rule on January 21, 2025. The public comment period closed on March 24, 2025. Although the method remains draft, EPA has long encouraged laboratories, regulatory authorities, and other interested parties to review and use the draft versions of this method, including in NPDES permits, and a number of states have begun offering accreditation for some version of 1633 or 1633A.

Eurofins has thoroughly reviewed the final draft of method 1633A, determined what was needed for implementation across our network, and implemented a standardized approach across all supporting laboratories.

Download our 1633A FAQ document to learn more

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