Even as EPA Draft Method 1633 goes through revisions, it’s already become the go-to method for many regulatory programs. For example, the U.S. EPA strongly encourages Draft Method 1633 for NPDES (National Pollutant Discharge Elimination System) permitting. The Department of Defense calls for Draft Method 1633 when testing AFFF (Aqueous Film-Forming Foam) and F3 (Fluorine-Free Foam) for PFAS. At least twelve states have even updated their lab accreditation programs to include Draft Method 1633.
