EPA Proposes Delaying PFAS Compliance, Revoking Standards for Four Chemicals

The Environmental Protection Agency (EPA) proposed significant changes to its PFAS drinking water regulations in May 2026, including extending compliance deadlines and rescinding standards for several chemicals[1][4]. These actions could alter the timeline and scope of public health protections against per- and polyfluoroalkyl substances (PFAS), which were previously anticipated to prevent illnesses for approximately 100 million people[17].

What the records show

One proposed rule would extend the compliance deadline for public water systems to meet the established Maximum Contaminant Levels (MCLs) for PFOA and PFOS[1][6]. These MCLs, set at 4 parts per trillion (ppt), would remain unchanged, but the deadline for water systems to comply would shift from April 2029 to April 2031[6][8]. The EPA states this extension aims to strengthen "practical implementation" for systems facing challenges like high capital costs, supply chain disruptions, or workforce limitations[7][15].

The second proposed rule seeks to rescind the regulatory determinations and associated MCLs for four other PFAS compounds: PFHxS, PFNA, HFPO-DA (often called GenX), and Hazard Index mixtures involving these three plus PFBS[1][5]. The EPA asserts this rescission is based on "legal and procedural considerations under the Safe Drinking Water Act (SDWA)" to correct errors from a previous administration, rather than a re-evaluation of health risks[11][12][13]. The agency has indicated it may re-regulate these chemicals through a lawful process in the future[20].

Timeline

On April 10, 2024, the EPA announced its final National Primary Drinking Water Regulation (NPDWR) for six PFAS compounds, establishing MCLs for PFOA, PFOS, PFHxS, PFNA, HFPO-DA (GenX), and Hazard Index mixtures[3]. In May 2026, the EPA then announced its two new proposed rules addressing PFAS in drinking water[1][4]. A virtual public hearing allowed stakeholders to provide comments on July 7, 2026[9]. The public comment period for both proposed rules officially closed on July 20, 2026[10]. The original compliance deadline for PFOA and PFOS was April 2029, now proposed for April 2031[6].

What changed and for whom

Public water systems may gain an additional two years to comply with PFOA and PFOS standards, easing potential burdens related to infrastructure upgrades and resource allocation[6][7][15]. However, the proposed rescission of MCLs for PFHxS, PFNA, HFPO-DA (GenX), and their mixtures means that public water systems would no longer be federally mandated to regulate these specific compounds[5][11]. This could lead to a delay or reduction in protections for the public from these specific PFAS chemicals[17].

What the subject has said publicly

EPA Administrator Zeldin stated the agency aims to "fix[] that error with standards water systems can actually implement and that will hold up to scrutiny"[14]. While the EPA frames its actions as procedural corrections and efforts to strengthen "practical implementation," some observers and news outlets, such as The Guardian, have described the changes as a "rollback" or "scaling back" of previous PFAS regulations[1][2][16][19]. The Office of Advocacy of the U.S. Small Business Administration has expressed support for the EPA's proposals, citing the flexibility and transparency they offer to small water systems[18].

What we could not confirm

PrimaryBrief could not confirm the final decisions on these proposed rules, nor the exact number of water systems that may opt for the extended compliance deadline.