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EPA Validates First Analytical Method for PFAS in Wastewater, Surface Water, Groundwater, and Soils.
A partnership between EPA and the DOD’s Strategic Environmental Research and Development Program has produced draft Method 1633, a single-laboratory validated method to test for 40 PFAS compounds in wastewater, surface water, groundwater, soil, biosolids, sediment, landfill leachate, and fish tissue. Until now, regulated entities and environmental laboratories relied upon modified EPA methods or in-house laboratory standard operating procedures to analyze PFAS in these settings. With the support of the agency’s Council on PFAS, EPA and DoD will continue to collaborate to complete a multi-laboratory validation study of the method in 2022.
This draft method can be used in various applications, including National Pollutant Discharge Elimination System (NPDES) permits. The method will support NPDES implementation by providing a consistent PFAS method that has been tested in a wide variety of wastewaters and contains all the required quality control procedures for a Clean Water Act (CWA) method. While the method is not nationally required for CWA compliance monitoring until EPA has promulgated it through rulemaking, it is recommended now for use in individual permits.
Draft Method 1633 complements existing validated methods to test for PFAS in drinking water and non-potable water.
For more information on CWA Analytical Methods for PFAS, visit:
For Frequent Questions about PFAS Methods for NPDES Permits, visit:
The U.S. EPA signed an amendment to the rule on February 28, 2022 that removes the stay of the formaldehyde limit for lean premix and diffusion flame gas-fired units that were constructed or reconstructed after January 14, 2003.