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PFAS 2025

Adopted rule

Administrative Order No.: DEQ-28-2025

Filed and Effective: Sept. 12, 2025

See Oregon Bulletin, October 2025

Rulemaking contact: Sarah Van Glubt, 503-709-8253,  PFAS.2025@deq.oregon.gov 

This Environmental Quality Commission adopted rules to include some per- and polyfluoroalkyl substances (PFAS) in the definition of hazardous substances in Oregon Administrative Rule 340-122-0115 (30). This gives DEQ authority to require investigation and removal and remedial actions of PFAS releases and align with the U.S. Environmental Protection Agency. This rulemaking added four PFAS compounds in addition to PFOA and PFOS: perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), hexafluoropropylene oxide dimer acid (HFPO-DA, commonly known as GenX Chemicals), and perfluorobutane sulfonic acid (PFBS). PFOA and PFOS are among the most commonly detected PFAS, are known or suspected carcinogens, and have been shown to exhibit toxicity effects to humans and wildlife even at low levels of exposure.

Advisory committee

DEQ convened an advisory committee to review the technical issues and fiscal impacts related to the proposed rules. In convening this committee, DEQ appointed members that reflect the range of entities that are both directly and indirectly affected by proposed changes to the rules.

Public involvement

The comment period closed at 4 p.m., May 9, 2025. Previously, the deadline for comments had been set for 4 p.m. on Friday, April 25, 2025.

For more information, see the Notice of Proposed Rulemaking, which includes the notice and proposed rules.

Additional information

Public hearing 

DEQ held two public hearings on Tuesday, April 22, 2025.

EQC action

The Environmental Quality Commission adopted these rules at its meeting on Sept. 11, 2025.

Item B: Cleanup Program PFAS 2025 Rulemaking (Action)