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ARTICLE · 06 JULY 2026

NJDEP Adopts Interim Specific Groundwater Standards For PFAS

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On June 15, the New Jersey Department of Environmental Protection (NJDEP) published a notice of rule adoption formally establishing new regulatory standards applicable to hexafluoropropylene oxide dimer acid...

United StatesEnvironment
Kegan A. Brown
Kegan A. Brown
Mark Heinzelmann
Mark Heinzelmann
Taylor R. West
Taylor R. West

On June 15, the New Jersey Department of Environmental Protection (NJDEP) published a notice of rule adoption formally establishing new regulatory standards applicable to hexafluoropropylene oxide dimer acid and its ammonium salt (collectively, GenX), perfluorononanoic acid (PFNA), perfluorooctanoic acid (PFOA), and perfluorooctane sulfonic acid (PFOS).1 This latest regulatory action sees the NJDEP continuing to broaden New Jersey’s regulation of per- and polyfluoroalkyl substances (PFAS), a category the agency has identified as chemicals of emerging concern. 

New Regulatory Standards

New Jersey has long been a national leader in PFAS regulation, becoming the first state to set drinking water standards for PFAS when it adopted a maximum contaminant level for PFNA in 2018 and set limits for PFOA and PFOS in 2020.2 With the adoption of this new rule, New Jersey is now one of the first states to establish regulatory standards that are directly applicable to a widely characterized

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