The D.C. Circuit Court of Appeals has upheld the Environmental Protection Agency's final rule listing PFOA and PFOS as hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act, leaving in place federal release-reporting and Superfund-liability obligations for waste and recycling operators that handle the two compounds.

The rule, which EPA issued under CERCLA Section 102(a), added the two per- and polyfluoroalkyl substances to a list that triggers immediate statutory consequences: any release of one pound or more within a 24-hour period triggers mandatory notification to the National Response Center, and the listing exposes handlers to cost-recovery and natural-resource damage claims under Superfund.

Petitioners — industry trade associations and chemical manufacturers — argued that EPA exceeded its CERCLA authority and that the rule's threshold and supporting cost analysis were arbitrary. The appellate panel rejected those challenges and sustained the rule. The decision leaves EPA's reporting regime operational while industry litigants evaluate further review options, including rehearing en banc and a certiorari petition to the Supreme Court.

The one-pound threshold sits low on the operational scale. A single drum of PFAS-bearing concentrate, a broken fire-suppression system containing aqueous film-forming foam, or a contaminated leachate batch from a landfill cell can each exceed the trigger. Waste haulers, transfer stations, materials recovery facilities, and PFAS-containing material recyclers now operate under release-reporting duties that did not exist before the rule took effect.

EPA built the rule with a delayed trigger for the reporting thresholds. Manufacturers and importers received an 18-month advance-notification window before downstream handlers became subject to release-reporting obligations, a structure intended to give waste operators time to identify PFAS in incoming streams. That runway closed, and reporting deadlines are now live or approaching across the supply chain.

The CERCLA designation sits inside a wider PFAS regulatory stack. EPA has issued drinking-water standards for six PFAS compounds, is processing significant new use rules under the Toxic Substances Control Act, and has signaled intent to list additional PFAS under CERCLA. Each new designation would carry the same one-pound trigger that the court just upheld, widening the operational footprint for waste handlers and recyclers.

What does the ruling change for operators?

It eliminates the litigation pause that several industry petitioners sought. Reporting obligations that were already on the calendar now carry no conditional language. Operators that built segregation, inventory, and emergency-response protocols since EPA finalized the rule face lower transition costs. Operators that deferred investment now operate against a court-endorsed federal deadline framework rather than a contested proposal.

It also clarifies liability exposure. CERCLA imposes strict, joint, and several liability for response costs on owners, operators, transporters, and arrangers. A PFOS or PFOA release above the one-pound threshold exposes each category to contribution claims. Insurers, investors, and lenders reviewing waste-company disclosures now have a definitive regulatory backdrop rather than a contingent one.

What happens next?

Two procedural deadlines carry the legal calendar. A petition for rehearing en banc must be filed within 90 days of the court's judgment. A certiorari petition to the Supreme Court runs on the same 90-day clock from denial of rehearing or, if rehearing is denied without comment, from the entry of judgment. Industry petitioners have signaled intent to seek further review; a denial at either stage would let the rule's compliance calendar run uninterrupted.

EPA's parallel rulemaking activity is the second milestone to track. The agency has flagged additional PFAS designations for CERCLA listing. Each new designation layers onto the same reporting trigger. Waste operators managing PFAS-bearing streams should expect the operating footprint to widen before it narrows, regardless of the litigation outcome.

For circular-economy businesses that handle PFAS-bearing inputs — including textile recyclers, paper processors handling treated grades, and metal finishers processing fluorinated coatings — the practical calculus has shifted. The court's decision converts a contested federal requirement into an enforceable one. Operators that treat the listing as a settled baseline and build inventory and emergency-response capability around it will avoid the larger transition cost when additional PFAS join the list.