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EPA Announces New Method 533 for PFAS in Drinking Water

On December 18th, EPA announced the new validated Method 533 for testing additional short chain per- and polyfluoroalkyl substances (PFAS) in drinking water. Method 533 measure PFAS by isotope dilution anion exchange solid phase extraction and liquid chromatography/tandem mass spectrometry (LC-MS/MS). The lowest concentration minimum reporting levels (LCMRLs) for the method analytes are provided in a table and range from 1.4 to 16 nanograms/L ((ng/L) or parts per trillion (ppt)). The combination of this new method and existing EPA methods can now measure 29 different PFAS compounds in drinking water. For more information, visit EPA’s website and view Method 533 and a table of analytes for EPA Methods 533 and 537.1. For questions, please contact Eric Burneson, Director of EPA’s Standards and Risk Management Division, at Burneson.Eric@epa.gov.