If you feel like the acronym universe has been expanding faster than the actual universe, you’re not wrong. “PFOA and P” (we’ll politely finish that last letter for you: PFOS) are two of the most talked-about PFASaka “forever chemicals”and the EPA’s decision to keep them designated as hazardous substances under CERCLA (the Superfund law) keeps them in the center ring of the regulatory circus.

Here’s the headline in plain English: after a federal rule in 2024 made PFOA and PFOS (including their salts and structural isomers) CERCLA hazardous substances, EPA reviewed the policy direction in 2025 and announced it would retain the designationwhile litigation continues and while EPA signals it wants a more standardized framework for future hazardous-substance designations under CERCLA Section 102(a).

Quick Timeline: How We Got Here (Without Needing a Time Machine)

What “CERCLA Hazardous Substance” Actually Means (And What It Doesn’t)

CERCLA is the law that powers Superfund cleanups. When a chemical is a “hazardous substance” under CERCLA, it can trigger a set of tools: reporting obligations, cleanup authority, cost recovery, and the ability to pursue potentially responsible parties (PRPs) for response costs. It’s less “new paperwork” and more “welcome to the main stage.”

1) It triggers release reporting at a very specific threshold

The rule sets the reportable quantity (RQ) for PFOA and PFOS at one pound in a 24-hour period. If a facility (or vessel) releases that amount or more, the release must be reported consistent with CERCLA Section 103 and EPCRA Section 304 requirements. This is the part where compliance teams stop sipping coffee and start opening binders labeled “Incident Response.”

2) It can widen the universe of Superfund liability

CERCLA liability is famously strict and can be retroactive. Translation: you can be brought into a cleanup even if the contamination is old and even if multiple parties are involved. The legal mechanics are complicated, but the business takeaway is simple: when a contaminant is a CERCLA hazardous substance, it becomes easier for regulators (and other parties) to point to the Superfund toolbox.

3) It does not automatically ban PFAS or instantly set cleanup standards everywhere

A hazardous-substance designation isn’t a product ban. It’s also not a magical national cleanup number that appears overnight on a stone tablet. What it does do is strengthen EPA’s ability to require investigation and cleanup, and to seek cost recovery where the legal elements are met. In the real world, cleanup decisions still hinge on site conditions, pathways, exposure, and applicable standards.

So Why Did EPA “Retain” the Designation in 2025?

In its September 17, 2025 announcement, EPA said it was retaining the PFOA/PFOS CERCLA hazardous substance designation that became effective July 8, 2024. EPA’s message emphasized the breadth of CERCLA liability and acknowledged the controversy around “passive receiver” liabilityentities that may not have manufactured PFAS but may have received it through products, feedstocks, or waste streams.

EPA also signaled it intends to develop a CERCLA Section 102(a) Framework Rulea kind of “how we do this next time” playbookdesigned to bring a more uniform approach to future hazardous substance designations, including how the agency will consider costs. Think of it as EPA saying: “We’re keeping this rule, and we’re also writing the instruction manual for the next ones.”

The Lawsuit: Why the Designation Is Still Being Fought (and What the Court Is Asking)

Challenges to the designation have focused heavily on process and economicsquestions like whether EPA needed a specific kind of economic analysis, whether the analysis provided was sufficient, and whether the public had appropriate opportunities to comment on key materials. These arguments are now living their best lives in federal court.

Oral argument in the D.C. Circuit was held on January 20, 2026, with significant attention on cost-benefit and analytical issues tied to the final rule. The legal outcome is uncertain, but the stakes are clear: the court’s decision could influence how EPA can use CERCLA Section 102(a) for future designationsespecially for chemicals that aren’t already listed through other environmental statutes.

EPA’s Enforcement Discretion: The “We’re Not Coming After Everyone” Memo

One reason this policy debate gets so heated is that CERCLA can be a very wide net. EPA tried to calm some of that anxiety by issuing a PFAS enforcement discretion and settlement policy memo. In it, EPA stated it does not intend to pursue certain entitiesincluding farmers, municipal landfills, water utilities, municipal airports, and local fire departmentswhere equitable factors don’t support seeking response actions or costs under CERCLA.

Two important notes:

• Enforcement discretion is not the same as a legal exemption. It is a statement of priorities and approach, not a rewrite of CERCLA’s liability provisions.
• Private-party litigation is still a thing. Even if EPA is selective, other parties can still fight about cost allocation, contribution claims, and who pays how much.

What This Means for Businesses, Cities, and the People Who Didn’t Ask to Become PFAS Experts

The retained designation affects different sectors in different ways. Here’s a practical look at what may changeespecially in risk planning, transactions, and site management.

Manufacturers and industrial users

If PFOA/PFOS were used historically (or present in legacy equipment, waste streams, or firefighting foam), companies may see increased scrutiny in investigations and cost recovery. Companies that manufactured PFAS or used PFAS in manufacturing remain at the center of EPA’s “polluter pays” storyline.

Wastewater, biosolids, and solid waste operations

PFAS can travelsometimes rudelythrough municipal and industrial systems. Landfills and wastewater facilities have raised concerns about being treated like the “end of the line” for contamination they didn’t create. EPA’s discretion memo is aimed at reducing that fear, but the operational reality remains: testing, management practices, and documentation matter more than ever.

Airports and firefighting foam (AFFF) legacy issues

Aqueous film-forming foam has been a major PFAS pathway at airports and training sites. The designation makes it easier for Superfund tools to come into play at contaminated areas, which can translate into more rigorous site investigation, planning, and potential cost allocation among responsible parties.

Commercial real estate and brownfields

If you’re buying or redeveloping property, PFAS has moved from “nice-to-know” to “you should probably ask.” The designation doesn’t automatically make a property owner liable, but it can complicate the path to liability protections and raises questions about whether (and when) to test, how to negotiate representations and indemnities, and how to manage potential discoveries.

Practical Compliance and Risk Steps (Because Panic Is Not a Strategy)

1. Inventory and map potential PFAS touchpoints. Focus on historical processes, firefighting foam usage, waste handling, and legacy equipment.
2. Review incident response and reporting protocols. The one-pound-in-24-hours reporting trigger is specific; make sure your team knows what to do when something goes sideways.
3. Strengthen vendor and waste-stream documentation. If PFAS enters or leaves your facility through materials or waste, documentation can be the difference between clarity and chaos later.
4. In transactions, upgrade environmental due diligence. Consider whether Phase I/Phase II scopes should address PFAS based on property history and useespecially for industrial sites, airports, and manufacturing corridors.
5. Watch litigation and future rulemaking. EPA’s planned 102(a) framework rule could change the “playbook” for future designations, and the court decision could reshape the boundaries.

FAQ: The Questions Everyone Asks (Often With the Same Thousand-Yard Stare)

Are PFOA and PFOS still hazardous substances even though the rule is in litigation?

Yes. EPA’s own program guidance makes clear thatdespite litigationPFOA and PFOS are currently hazardous substances under CERCLA.

Does the designation mean EPA will automatically come after my town, landfill, or water utility?

EPA has stated it does not intend to pursue certain “passive receiver” categories where equitable factors don’t support it, and it has emphasized a focus on significant sources. But that’s an enforcement posture, not a blanket immunity, and private-party disputes can still happen.

Does this designation solve PFAS contamination overnight?

No. It strengthens the legal tools and can accelerate investigations and cleanups, but PFAS remediation is technically complex, often expensive, and highly site-specific. “Forever chemicals” don’t turn into “weekend cleanup chemicals” just because a rule exists.

Real-World Experiences Related to “EPA Retains CERCLA Hazardous Substance Designation for PFOA and P” (Approx. )

Across the country, the most common “experience” with the retained CERCLA designation isn’t a dramatic courtroom monologueit’s a slow, practical shift in how organizations plan, document, negotiate, and communicate. And yes, it often begins with someone forwarding an alert email that ruins everyone’s afternoon.

One pattern repeatedly described by environmental managers is the new urgency around internal PFAS mapping. Facilities that once treated PFAS as “someone else’s problem” are now building process histories: when certain surfactants were used, what products were stored, where wastewater went, and whether any legacy firefighting foam was used on-site. The experience here is less about a single compliance checkbox and more about constructing a defensible narrativebecause if a site is investigated, uncertainty becomes expensive.

In the municipal world, water utilities and local governments often describe a different experience: fear of being blamed for contamination they didn’t manufacture. The retained designation raised anxiety about becoming a PRP simply for treating contaminated water or handling residuals. EPA’s enforcement discretion memo helped emotionally (and politically), but many local agencies still report spending more time on recordkeeping, chain-of-custody protocols for sampling, and communications planning. In practice, utilities are building “proof files” showing they are responders and protectors, not creators of the contaminationbecause in Superfund conversations, clarity is currency.

Commercial real estate professionals have their own version of PFAS whiplash. A frequent experience in transactions is the PFAS due diligence dilemma: if you test, you might find something that triggers disclosure, negotiation, or remediation planning. If you don’t test, lenders and buyers may treat the unknown as a risk premium. Many deals now include more detailed environmental reps, specialized indemnity language, escrow arrangements, or explicit PFAS carveouts. In other words, PFAS is becoming a standard character in the closing documentslike that one relative who always shows up uninvited but somehow still gets a seat at the table.

Airports, industrial parks, and properties with historical firefighting training areas often report an experience that can be summarized as: “We’re not new to PFAS, but the stakes feel higher now.” The retained designation sharpens attention on source identification and cost allocation. Stakeholders describe more active engagement with consultants to evaluate migration pathways, delineate plumes, and document historical foam use. Even when cleanup is not immediately ordered, the work shifts toward readiness: knowing what’s there, what it means, and who might share responsibility.

Finally, many organizations report a cultural change: PFAS risk is no longer siloed in EHS. Legal, finance, procurement, and communications teams are now in the room. The experience of the retained designation is, in a very real sense, a governance experienceone that rewards preparation, transparency, and disciplined decision-making over last-minute scrambling. Because in the PFAS era, the question isn’t “Will anyone ever ask?” It’s “What will we say when they do?”

Conclusion

EPA’s decision to retain the CERCLA hazardous substance designation for PFOA and PFOS keeps Superfund authority firmly in play for two of the most scrutinized PFAS in America. For communities, it signals more leverage for investigation and cleanup. For businesses and “passive receivers,” it raises hard questions about fairness, cost allocation, and what responsibility looks like when contamination moves through complex modern systems.

The smart move now is to treat PFAS risk like a long game: build documentation, tighten incident procedures, modernize due diligence, and watch both the courts and EPA’s next rulemaking steps. In Superfund land, the best surprise is the one you prevented.

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