Checklist · Environmental

Responding to a CERCLA Potentially Responsible Party Notice: A Practical Checklist

42 U.S.C. § 9622(e)

Type
Checklist
Jurisdiction
National
Date
2024-09-14
Topic
Environmental

A Superfund PRP letter is not a lawsuit, but it is the opening move in a liability regime that is strict, retroactive, and often joint and several — and the decisions a company makes in the first sixty days shape its exposure for the next decade. This checklist walks the whole arc in thirteen phases, beginning with identifying whether you received a general notice, a special notice that triggers a settlement moratorium, or a § 104(e) information request with penalty teeth, and issuing a litigation hold before anyone touches a site file. It then covers answering the information request truthfully and completely while scoping it carefully, reconstructing your own historical connection to the site, testing yourself against the four PRP classes of § 107(a) and the narrow statutory defenses, and evaluating the de micromis and de minimis exits available to small contributors. It works through volumetric, toxicity-based, and Gore-factor allocation, joining or forming a PRP group and negotiating the participation agreement, tendering to decades-old occurrence-based CGL policies that may still respond to legacy contamination, and evaluating a settlement for the contribution protection it actually buys. A final phase preserves cost-recovery and contribution claims under the Atlantic Research / Cooper Industries / Guam line and the § 113(g) limitations periods. It closes with the mistakes that cost companies the most money and a consolidated one-glance checklist, plus a note on the areas — penalty amounts, PFAS designation, and all of insurance coverage doctrine — that must be verified against current law before you rely on them.

Responding to a CERCLA Potentially Responsible Party Notice: A Practical Checklist

Environmental > Environmental Litigation | Published 14 September 2024 - Updated 27 January 2026 | UpLaw - uplaw.us

A PRP letter is a piece of mail, not a complaint. It is also the most expensive piece of mail your company will ever open. CERCLA liability is strict, retroactive, and frequently joint and several — which means the question is almost never "did we do anything wrong," but "what share can we prove, and who else can we make pay."

Keywords: CERCLA, Superfund, potentially responsible party, PRP notice, special notice letter, § 104(e) information request, joint and several liability, arranger liability, de minimis settlement, bona fide prospective purchaser, contribution, § 113(f), PRP group, cost allocation, historical CGL coverage

Phase 1 — Identify exactly what you received

  • [ ] Read the letter's caption and locate the statutory hook: is it a general notice letter, a special notice letter under CERCLA § 122(e), 42 U.S.C. § 9622(e), an information request under § 104(e), 42 U.S.C. § 9604(e), or a unilateral administrative order (UAO) under § 106, 42 U.S.C. § 9606?
  • [ ] Calendar the response deadline the day the letter arrives, and calendar it twice (a 10-day internal warning and the hard date).
  • [ ] If it is a special notice letter, determine the moratorium window: § 122(e) generally imposes a 60-day moratorium on EPA taking § 104 or § 106 action, extendable if PRPs make a good-faith offer.
  • [ ] Identify the site by name and EPA ID, whether it is on the National Priorities List, and what phase the cleanup is in (removal, RI/FS, remedial design, remedial action, or cost recovery).
  • [ ] Determine whether the sender is EPA, a state environmental agency under a state Superfund analog, or a private party PRP group sending a "contribution demand" — the leverage and deadlines differ completely.
  • [ ] Confirm whether a UAO is enclosed. If so, note the compliance date immediately: refusing to comply "without sufficient cause" exposes you to civil penalties under § 106(b)(1) and punitive damages of up to three times response costs under § 107(c)(3).
  • [ ] Ask whether the letter names your company, a predecessor, a dissolved subsidiary, or an entity you acquired — successor questions change who must respond.

Why it matters, and the traps. The three letters do three different things. A general notice letter tells you EPA believes you may be liable and invites you to participate; it usually has no penalty attached, and companies that ignore it lose nothing legally but everything strategically — the PRP group forms without them and the allocation is set by people who have no incentive to be generous. A special notice letter is the one that starts the clock on negotiation: it triggers the § 122(e) moratorium and signals that EPA is prepared to hand you a UAO if talks fail. A § 104(e) information request is not an invitation at all. It is compulsory process, backed by civil penalties, and it is the single most common way companies convert a small problem into a large one.

The trap in Phase 1 is treating a PRP letter as a lawsuit and doing nothing until you are served. Superfund does not work that way. There is no pre-enforcement judicial review of a selected remedy — § 113(h), 42 U.S.C. § 9613(h), strips jurisdiction — so you cannot go to court and ask a judge to tell EPA it is being unreasonable. Your leverage lives entirely in the administrative process, and the administrative process runs on the deadlines in the letter you just received. The intake discipline here is the same as for any bet-the-company matter; the framework in Evaluating a New Civil Case: A Practical Checklist applies almost without modification.

Phase 2 — Understand the liability regime before you say a word

  • [ ] Internalize the three defining features of § 107(a) liability: it is strict (no negligence, no fault), retroactive (conduct lawful when it occurred is still actionable), and, where the harm is indivisible, joint and several.
  • [ ] Confirm the four elements EPA must show: (1) the site is a facility; (2) there has been a release or threatened release of a hazardous substance; (3) the release caused the government to incur response costs; and (4) the defendant falls within one of the four PRP classes in § 107(a).
  • [ ] Understand that "causation" in the ordinary tort sense is not an element as to your specific waste — EPA need not trace your drum to the plume.
  • [ ] Read United States v. Chem-Dyne Corp., 572 F. Supp. 802 (S.D. Ohio 1983), and the divisibility framework it borrowed from Restatement (Second) of Torts § 433A. It is the doctrinal root of joint and several liability under CERCLA.
  • [ ] Assess, early, whether you have a divisibility argument: Burlington Northern & Santa Fe Railway Co. v. United States, 556 U.S. 599 (2009), holds that apportionment is available when there is a reasonable basis for determining the contribution of each cause to a single harm — but the burden is on the defendant, and courts have been stingy.
  • [ ] Distinguish apportionment (a defense to joint and several liability, decided at the liability stage) from allocation (an equitable division among PRPs in contribution, decided later). Conflating them is a classic error.

Why it matters, and the traps. Executives hear "we followed every law in effect in 1978" and assume that is a defense. It is not. CERCLA reaches back and imposes liability on conduct that was entirely lawful when performed. The only questions that matter are status (are you in a PRP class?), fact (did your material go to this site?), and share (what can you prove about volume, toxicity, and equity?).

The joint-and-several piece is what makes the stakes asymmetric. If ten PRPs are named and eight are defunct, the two solvent companies can be held liable for the whole remedy unless they carry the divisibility burden. Burlington Northern offered a real path — the Court upheld an apportionment based on the percentage of land area, duration of ownership, and volume of hazardous product — but read the case carefully before betting on it. Lower courts routinely find harm indivisible at a commingled-plume site because there is no reasonable basis to allocate a single, blended groundwater contamination. Assume joint and several liability, then work to disprove it.

For a doctrinal treatment of the whole statutory scheme — including how CERCLA interacts with RCRA corrective action, and the Clean Air and Clean Water Act permitting regimes that often govern the same facility — see Environmental Law: A Comprehensive Guide to CERCLA, RCRA, the Clean Air Act, and the Clean Water Act.

Phase 3 — Issue the litigation hold before anyone touches a file

  • [ ] Issue a written litigation hold the same week the notice arrives. A § 104(e) request is unambiguously a trigger; so is a general notice letter.
  • [ ] Suspend all routine document destruction — including the records-retention schedule that would otherwise purge 40-year-old plant files, shipping manifests, and purchasing records.
  • [ ] Identify custodians who do not appear on a modern org chart: retired plant managers, former environmental coordinators, the corporate archivist, plant engineering, the insurance-risk department, and outside waste brokers.
  • [ ] Sweep non-obvious repositories: microfiche, basements at closed plants, warehouse boxes, legacy AS/400 and mainframe backups, and paper insurance binders.
  • [ ] Preserve the insurance archaeology materials as a distinct category — old CGL policies, certificates of insurance, broker ledgers, premium invoices — before they are swept up in a general purge.
  • [ ] Document the hold: distribution list, acknowledgments, reminders, and the scope memo.

Why it matters, and the traps. Superfund matters routinely reach back four decades, which means the evidence you need was created by people who are dead and stored in formats nobody at the company can read. Two things happen at once: the documents that would exonerate you (a manifest showing you sent 12 drums, not 1,200) are the same documents that would incriminate you, and the reflex to "clean up the files" is strongest exactly when it is most dangerous. Spoliation in a CERCLA case is uniquely brutal because the missing records go directly to volumetric share; when your manifests are gone and everyone else's survive, the group's allocation consultant will assign you the residual.

Run the hold the way you would run any ESI preservation program — the mechanics, custodian interviews, and documentation standards in Issuing a Litigation Hold and Preserving ESI: A Practical Checklist transfer directly, with the added wrinkle that most of your key evidence is on paper.

Phase 4 — Answer the § 104(e) request: truthful, complete, carefully scoped

  • [ ] Read every definition and instruction in the request. § 104(e) requests define terms like "your company," "the site," and "hazardous substance" expansively; the definitions do most of the work.
  • [ ] Call the EPA case attorney or on-scene coordinator. Extensions and scope narrowing are routinely granted and almost never denied to a cooperative respondent who asks early.
  • [ ] Answer truthfully and completely. False statements to a federal agency are independently criminal under 18 U.S.C. § 1001, entirely apart from CERCLA.
  • [ ] Where a question is genuinely ambiguous or overbroad, state your reasonable interpretation on the record and answer under it — do not silently narrow.
  • [ ] Interview retirees before you answer, not after. Their memory is often the only source for waste-stream and transporter facts.
  • [ ] Log and assert privilege carefully. Facts are not privileged; the site history you reconstruct is discoverable, but counsel's analysis of it need not be.
  • [ ] Note the penalty exposure: § 104(e)(5) authorizes civil penalties per day of noncompliance. The dollar figure is adjusted for inflation annually under the Federal Civil Penalties Inflation Adjustment Act — check EPA's current civil monetary penalty table at 40 C.F.R. Part 19 rather than relying on the number printed in the statute.
  • [ ] Preserve a complete copy of everything produced, indexed and Bates-numbered, for the allocation fight to come.

Why it matters, and the traps. The § 104(e) response is your first sworn account of your relationship to the site, and every later position you take — in the PRP group, in allocation, in litigation, with your insurers — will be tested against it. Two failure modes dominate. The first is the defensive crouch: a response so grudging and narrow that EPA concludes you are hiding something and escalates. The second, more dangerous, is the casual overstatement: a well-meaning plant veteran who tells EPA "oh, we sent everything there for years," when in fact the site received your solvent waste for eighteen months. That sentence, once written, is worth millions in allocation, and you will spend years trying to walk it back.

Treat this as compulsory government process, because it is — the discipline in Responding to a Government Subpoena or Investigation: A Practical Checklist governs, particularly the rules on scope negotiation, custodian interviews, and never letting a business unit answer the government directly.

Worked example. Calderwood Precision Castings, a family-held metal-finishing company in Ohio, receives a general notice letter and a § 104(e) request naming the Marrow Creek Drum & Barrel site, a defunct drum reconditioning yard. Calderwood's general counsel is told by a retired foreman that "we used Marrow Creek for our spent trichloroethylene, but only until we switched to aqueous cleaning." Rather than take that at face value, counsel pulls purchasing ledgers, finds TCE purchase records ending in the third quarter of 1984, and locates 41 waste manifests in a microfiche box at the closed Millbrook plant. Calderwood's § 104(e) response is precise: 41 shipments, totaling approximately 2,050 gallons of spent TCE, between March 1982 and September 1984, transported by a hauler that has since dissolved. That precision — offered voluntarily, documented, and verifiable — becomes the single most valuable asset Calderwood owns in this matter.

Phase 5 — Reconstruct your own history at the site

  • [ ] Build a site-connection timeline: when did your material go there, by what route, in what volume, containing what constituents?
  • [ ] Pull and reconcile: waste manifests and bills of lading; purchasing records for the raw chemicals (a proxy for waste volume); transporter contracts and broker invoices; plant process descriptions and flow diagrams; and any RCRA-era generator reports.
  • [ ] Chase the corporate history: mergers, asset sales, name changes, dissolved subsidiaries, and any indemnity or "as-is" allocation in the deal documents.
  • [ ] Determine whether you ever owned or operated the site itself, as opposed to merely shipping waste to it.
  • [ ] Compare your volume against the site's total documented volume — your denominator matters as much as your numerator.
  • [ ] Characterize your waste stream's toxicity and mobility: a chlorinated solvent that drives a groundwater plume and a decades-long pump-and-treat remedy is a very different allocation story than inert foundry sand.
  • [ ] Where you acquired a facility or a business, retrieve the deal file — the environmental reps, the disclosure schedules, the escrow, and any surviving indemnity.

Why it matters, and the traps. Allocation is a fight over a spreadsheet, and the company with the better documents wins it. The trap is assuming that "no records" means "no liability." It means the opposite: in the absence of records, allocation consultants use surrogates — plant size, employee count, years of operation, industry-standard waste-generation coefficients — and surrogates are generous to nobody. The company that shows up with 41 manifests gets 41 manifests' worth of liability. The company that shrugs gets an estimate.

Corporate history is the other landmine. Successor liability under CERCLA follows state corporate law on the merger and de facto merger doctrines, and it is applied vigorously. If you bought the assets of a business twenty years ago, go read the purchase agreement — the environmental indemnity you forgot about may be your best asset, and the "as-is" clause you forgot about may be your worst. The diligence discipline that prevents this problem in the first place is set out in Conducting Merger and Acquisition Due Diligence: A Practical Checklist, and the site-specific inquiry that supports the statutory defenses is covered in Phase I Environmental Site Assessment and All Appropriate Inquiries: A Practical Checklist.

Phase 6 — Determine which PRP class you are actually in

  • [ ] Test yourself against the four classes in § 107(a), 42 U.S.C. § 9607(a): current owner/operator; owner/operator at the time of disposal; arranger (a person who arranged for disposal or treatment of hazardous substances); and transporter who selected the disposal site.
  • [ ] For arranger status, apply Burlington Northern: an entity qualifies as an arranger when it takes intentional steps to dispose of a hazardous substance. Selling a useful product that is later spilled is not, without more, arranging for disposal.
  • [ ] For operator liability of a corporate parent, apply United States v. Bestfoods, 524 U.S. 51 (1998): a parent is liable as an operator only if it directly operated the facility — managed operations related to pollution, leakage, or disposal — and is otherwise liable only where the corporate veil may be pierced under ordinary standards.
  • [ ] Note that "operator" under § 101(20) turns on actual, direct control over operations, not on stock ownership, overlapping directors, or general corporate oversight.
  • [ ] If you currently own the property, recognize that current owners are PRPs regardless of who caused the contamination — Atlantic Richfield Co. v. Christian, 140 S. Ct. 1335 (2020), is a sharp reminder that even a wholly innocent landowner can be a PRP under the statute's text.
  • [ ] For transporters, confirm whether your company selected the site; merely hauling to a site chosen by the generator is outside § 107(a)(4).

Why it matters, and the traps. Class matters enormously, because it determines which defenses are even available to you and how the allocation consultant will characterize you. Owners and operators are stuck with the site; arrangers are stuck with their waste. The most under-litigated question in most PRP responses is arranger intent. After Burlington Northern, a company that sold a useful chemical product, knowing some would inevitably spill during transfer, has a genuine argument that it never "arranged for disposal" — the Court held that knowledge of spillage is not the same as intent to dispose. That argument is fact-bound and it is not a magic wand, but companies whose only connection is a product sale should not accept arranger status by reflex.

The Bestfoods point is equally practical. Parent corporations are routinely named because they appear on the letterhead. Bestfoods is a real limit: EPA must show the parent's own personnel managed the facility's environmental operations, not merely that the parent owned the subsidiary. Board-level oversight and shared officers, standing alone, do not do it. The corporate-formalities hygiene described in Board Governance, Minutes, and Corporate Formalities: A Practical Checklist is, in the CERCLA context, quite literally a liability shield.

Phase 7 — Evaluate the defenses (all of which are narrow)

  • [ ] Test the three statutory defenses in § 107(b): act of God, act of war, and the third-party defense — the last requiring that the release was caused solely by a third party with whom you had no contractual relationship, that you exercised due care, and that you took precautions against foreseeable acts of that third party.
  • [ ] Test the innocent landowner defense, which runs through the § 101(35) definition of "contractual relationship" and requires all appropriate inquiries before acquisition, 42 U.S.C. § 9601(35).
  • [ ] Test bona fide prospective purchaser (BFPP) status under § 107(r) and § 101(40) — available even to a buyer who knows about the contamination, provided all disposal predated acquisition, AAI was performed, and the buyer satisfies the continuing obligations (reasonable steps, cooperation, compliance with land use restrictions, no affiliation with a liable party).
  • [ ] Test the contiguous property owner protection under § 107(q) for a neighbor contaminated by migration from an adjacent site.
  • [ ] Confirm any AAI you rely on was compliant: 40 C.F.R. Part 312, satisfied in practice by an ASTM E1527-compliant Phase I performed by an environmental professional within the applicable timing windows.
  • [ ] Do not treat any of these as self-executing. BFPP status is lost by failing the continuing obligations — a point that surprises buyers who did the Phase I, closed, and then did nothing.
  • [ ] Check whether the federally permitted release exclusion, the petroleum exclusion, or a recycling exemption under the Superfund Recycling Equity Act applies to your material.

Why it matters, and the traps. The defenses in CERCLA were drafted to be escape hatches, not exits, and courts have kept them that way. The third-party defense fails most often on the "contractual relationship" element: if you sent waste to the site under a hauling contract, the person who mishandled it is not a stranger to you. The innocent landowner and BFPP defenses fail most often on maintenance — the buyer who performed a textbook Phase I and then ignored a leaking drum on the property for five years has not taken "reasonable steps," and the protection evaporates.

The BFPP defense is nonetheless the single most valuable structural tool in modern brownfield practice, and it is prospective: it protects the buyer who does the work before closing. That is why the Phase I/AAI process is not a box-check but the foundation of the defense. See Phase I Environmental Site Assessment and All Appropriate Inquiries: A Practical Checklist for the mechanics.

Phase 8 — Check the small-party exits: de micromis and de minimis

  • [ ] Test the de micromis exemption under § 107(o), 42 U.S.C. § 9607(o): a statutory exemption for persons who arranged for or transported only very small quantities of material — the statute keys to volumes below the specified liquid/solid thresholds and to disposal occurring before the statutory cutoff date. Read the current statutory text; the thresholds and cutoff are specific and unforgiving.
  • [ ] Test the municipal solid waste exemption under § 107(p) if your only contribution was ordinary household or comparable commercial trash.
  • [ ] Evaluate a de minimis settlement under § 122(g), 42 U.S.C. § 9622(g), available where your contribution is minimal in both amount and toxic effect, or where you are a qualifying de minimis landowner.
  • [ ] Quantify the premium: de minimis cashout settlements typically price the base share and then add a substantial premium for the certainty of a covenant not to sue and contribution protection. Model whether the premium is worth the finality.
  • [ ] Confirm the settlement carries contribution protection under § 113(f)(2) — that is what you are actually buying.
  • [ ] Understand the reopener provisions: most administrative de minimis settlements reserve EPA's rights for unknown conditions or new information.

Why it matters, and the traps. For a genuinely small contributor, the de minimis cashout is almost always the right answer, and the mistake is haggling over the premium. The premium buys you contribution protection under § 113(f)(2), which means the major PRPs cannot come back and sue you for a share of a remedy whose cost has tripled. Paying a 60% premium on a $180,000 base share to walk away permanently from a site whose remedy may cost $200 million is not a bad deal; it is the entire point.

The trap runs the other way, too. Companies with genuinely tiny volumes sometimes fail to press for de micromis treatment or a § 122(g) settlement because nobody at the company has read § 107(o), and instead they get folded into the PRP group's general allocation and pay years of "orphan share" and group-administration costs. If your total contribution is a handful of drums, say so loudly, early, and with documents.

Phase 9 — Model the allocation: volume, toxicity, and the Gore factors

  • [ ] Build the volumetric baseline: your documented volume divided by the site's total documented volume. Then interrogate the denominator — is the site total complete, or does it omit defunct parties?
  • [ ] Adjust for toxicity and remedy-driving character: a small volume of a chlorinated solvent that drives a 30-year groundwater remedy may deserve a larger share than a large volume of inert material.
  • [ ] Apply the Gore factors, the six equitable considerations courts commonly use in § 113(f) allocation: ability to distinguish each party's contribution; the amount of hazardous substances involved; the degree of toxicity; the degree of involvement in generation, transport, or disposal; the degree of care exercised; and the degree of cooperation with government officials. (They come from a rejected amendment, not the statute — they are persuasive, not binding, and § 113(f)(1) simply directs courts to use "such equitable factors as the court determines are appropriate.")
  • [ ] Identify the orphan share — the portion attributable to defunct or insolvent parties — and fight over who absorbs it. This is often the largest single line in the negotiation.
  • [ ] Assess whether the United States or a state is itself a PRP at the site (federal contractor sites, wartime production, military waste). Federal PRP shares can be large and are frequently overlooked.
  • [ ] Retain an allocation expert and a technical consultant early; allocation is fought in the language of hydrogeology and volumetrics, not in the language of briefs.

Why it matters, and the traps. Allocation is where the money actually moves, and it is negotiated, not adjudicated, in the overwhelming majority of sites. The most common error is a legal team that argues doctrine while the technical consultants concede facts. Your volumetric share and your waste's role in driving the remedy are established in consultant workrooms long before any court sees the case. Staff those rooms.

The second error is failing to notice that "degree of cooperation with government officials" is an actual allocation factor. The company that stonewalled its § 104(e) request, missed the special-notice window, and forced EPA to issue a UAO does not merely have worse optics — it has a worse number.

Worked example, continued. Marrow Creek's documented total is 310,000 gallons. Calderwood's documented 2,050 gallons is roughly 0.66% by volume. But Calderwood's TCE is the constituent driving the groundwater plume and the pump-and-treat remedy, and the PRP group's allocation consultant proposes a toxicity-weighted uplift to 2.4%. Calderwood's counsel responds with two arguments: first, that four other PRPs also shipped chlorinated solvents in far greater volume, so TCE cannot be uniquely attributed to Calderwood; second, that the site operator's own reconditioning practice — rinsing drums directly onto bare ground — was the actual cause of the release, going to the "degree of care" factor as between Calderwood and the site owner. The negotiated share lands at 1.3%, and Calderwood separately declines to absorb any of the orphan share attributable to two dissolved haulers.

Phase 10 — Join or form the PRP group and negotiate the participation agreement

  • [ ] Decide whether to join the group. In almost all cases the answer is yes: groups share technical costs, present a unified front to EPA, and are where allocation is actually decided.
  • [ ] Read the participation agreement as the commercial contract it is. Key terms: interim cost-sharing formula; the mechanism and timing of final allocation; whether allocation is by binding ADR or by vote; the treatment of the orphan share; cash calls and default remedies; the standard for admitting late-joining PRPs; and the confidentiality and common-interest privilege provisions.
  • [ ] Insist on a genuine common-interest / joint-defense agreement, in writing, before sharing any site history with other PRPs.
  • [ ] Understand that interim shares are not final shares — but that they anchor the negotiation. Do not accept a placeholder that is worse than your evidence supports.
  • [ ] Negotiate an explicit exit ramp for a party that later qualifies for a § 122(g) de minimis settlement with EPA.
  • [ ] Get voting rights proportionate to exposure, or at least a veto on decisions that would materially change the remedy's cost.
  • [ ] Watch the de facto waiver risk: a participation agreement that requires members to release each other can extinguish contribution claims you would otherwise have.

Why it matters, and the traps. The PRP group is a joint venture among adversaries. Every other member has an economic interest in your share being larger. The interim cost-sharing formula, which everyone treats as administrative housekeeping, routinely calcifies into the final allocation because nobody wants to reopen a number that has been funding consultants for three years. Negotiate the interim number as if it were final, because it very likely is.

Phase 11 — Notify insurers, including the policies in the basement

  • [ ] Tender the PRP letter to every potentially responsive carrier, on every policy year in which contamination may have occurred, immediately — not after you have decided whether coverage exists.
  • [ ] Run insurance archaeology: pre-1986 occurrence-based CGL policies, which typically lacked the "absolute" pollution exclusion, may still respond to legacy contamination decades later. Search broker files, premium ledgers, board minutes, audit workpapers, and old certificates.
  • [ ] Analyze the pollution exclusion applicable to each policy year: many older policies contain the "sudden and accidental" qualified exclusion; post-1986 policies typically contain the absolute exclusion. How the "sudden and accidental" exclusion is construed is a matter of state law and states genuinely diverge — some read "sudden" as requiring temporal abruptness, others as meaning merely unexpected and unintended. Confirm your state's rule.
  • [ ] Analyze trigger of coverage — exposure, manifestation, injury-in-fact, or continuous trigger — which is likewise state-specific and can determine whether one policy year or thirty are on the risk.
  • [ ] Analyze allocation among triggered years (all-sums vs. pro rata) and exhaustion (horizontal vs. vertical, as in Montrose Chemical Corp. v. Superior Court (Cal. 2020), adopting vertical exhaustion under California law). Again: state law, and it varies.
  • [ ] Determine whether a PRP letter itself constitutes a "suit" triggering the duty to defend. The majority of states say yes for coercive agency action; a minority disagree. Check yours.
  • [ ] Preserve coverage: comply with notice conditions, do not settle without consent where the policy requires it, and do not voluntarily incur costs in violation of a voluntary-payments clause without first tendering.

Why it matters, and the traps. Historical CGL coverage is, for many companies, the difference between a survivable Superfund matter and an existential one — and it is the asset companies most often destroy through inattention. Late notice, a consent-to-settle violation, or a records purge that swept away the 1974 policy jacket can forfeit millions. Tender first, analyze second.

The doctrine here is entirely state law and it is genuinely unsettled at the edges; do not import a rule from a New Jersey case into a Texas coverage dispute. Start with Insurance Coverage Law: A Comprehensive Guide for Policyholders, run the tender through Tendering a Claim and Preserving Coverage: A Policyholder's Checklist, and use The Business Insurance and Coverage Toolkit to map the rest of the program.

Phase 12 — Evaluate settlement and price the contribution protection

  • [ ] Understand the settlement vehicles: an Administrative Settlement Agreement and Order on Consent (ASAOC) for removal or RI/FS work; a judicially entered consent decree for remedial design/remedial action and cost recovery; a § 122(g) de minimis administrative settlement; a § 122(h) cost recovery settlement.
  • [ ] Price the contribution protection: § 113(f)(2), 42 U.S.C. § 9613(f)(2), provides that a person who has resolved liability to the United States or a State in an administrative or judicially approved settlement shall not be liable for claims for contribution regarding matters addressed in the settlement.
  • [ ] Read the "matters addressed" clause with extreme care. It defines the exact scope of your protection, and the scope of your peace.
  • [ ] Read the reopeners and reservations of rights — for unknown conditions, new information, natural resource damages (NRD), and criminal liability.
  • [ ] Confirm the settlement's effect on the non-settlors: settlement reduces the government's claim against others by the settlement amount, which is why non-settlors will scrutinize your deal.
  • [ ] Evaluate a cashout versus work settlement: a cashout gives certainty; performing the work gives cost control but keeps you on the hook for overruns.
  • [ ] Model the UAO alternative honestly: refusing to settle and taking a § 106 order means compliance costs plus, if you refuse without sufficient cause, penalties under § 106(b)(1) and treble punitive damages under § 107(c)(3) — with no pre-enforcement review under § 113(h).
  • [ ] If the remedy selection itself is arbitrary, capricious, or not in accordance with law, understand that your challenge is deferred and channeled — and, when it ripens, it is an administrative-record challenge under APA standards.

Why it matters, and the traps. What you buy in a CERCLA settlement is not the absence of liability; it is contribution protection. A settlement that resolves your liability to EPA but leaves you exposed to a contribution suit from the major PRPs has bought you very little. Conversely, a settlement with a broad "matters addressed" clause can be worth many multiples of its face amount.

The remedy-challenge point deserves a caution. Section 113(h) generally bars pre-enforcement review, so you cannot sue EPA today to stop a remedy you think is gold-plated. When judicial review does become available, it proceeds on the administrative record under APA standards — and the administrative-law landscape shifted materially with Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024), which overruled Chevron and restored de novo judicial interpretation of statutes. Agency technical judgments still receive arbitrary-and-capricious review under 5 U.S.C. § 706(2)(A), but EPA's legal interpretations of CERCLA no longer receive binding deference. Build your record accordingly, and see Challenging Agency Action Under the APA: A Practical Checklist.

Phase 13 — Preserve your contribution and cost-recovery claims

  • [ ] Identify every other PRP — including defunct entities with surviving insurance, corporate successors, and the federal government.
  • [ ] Choose your claim correctly. Under United States v. Atlantic Research Corp., 551 U.S. 128 (2007), a PRP that voluntarily incurs cleanup costs may sue other PRPs under § 107(a)(4)(B) for cost recovery. Under Cooper Industries, Inc. v. Aviall Services, Inc., 543 U.S. 157 (2004), § 113(f)(1) contribution is available only during or following a § 106 or § 107(a) civil action.
  • [ ] Note the third path: § 113(f)(3)(B) contribution after an administrative or judicially approved settlement — but Territory of Guam v. United States, 141 S. Ct. 1608 (2021), holds that the settlement must resolve a CERCLA-specific liability, not merely some environmental liability under another statute.
  • [ ] Recognize that where § 113(f) contribution is available, courts have generally held it is the exclusive remedy — you cannot elect § 107 to escape the shorter limitations period or the equitable allocation.
  • [ ] Calendar the limitations periods under § 113(g), 42 U.S.C. § 9613(g): cost-recovery actions for removal actions generally within 3 years of completion; for remedial actions generally within 6 years of initiation of physical on-site construction; contribution actions generally within 3 years of the judgment, administrative order, or judicially approved settlement.
  • [ ] Ensure your privately incurred response costs are consistent with the National Contingency Plan, 40 C.F.R. Part 300 — private-party cost recovery requires NCP consistency, 40 C.F.R. § 300.700.
  • [ ] Remember Key Tronic Corp. v. United States, 511 U.S. 809 (1994): attorney's fees for litigation are generally not recoverable as response costs, though fees for work closely tied to the cleanup itself (such as identifying other PRPs) may be.
  • [ ] Preserve state-law claims — nuisance, trespass, negligence, and state Superfund contribution — which may reach costs and damages CERCLA does not, subject to Atlantic Richfield's limits on landowner restoration claims that conflict with the EPA-selected remedy.
  • [ ] Treat those state-law claims as genuinely state law: there is no nationwide tort rule here. The elements of private and public nuisance, the availability of restoration cost damages versus diminution-in-value damages, the operative statute of limitations and any discovery rule, whether the state recognizes a continuing-tort or continuing-trespass theory, and whether the state has its own Superfund analog with its own contribution right all vary materially. Plead under the law of the forum and confirm that state's rule rather than importing a formulation from another jurisdiction.

Why it matters, and the traps. The § 107-versus-§ 113 election is the most technically dangerous choice in CERCLA practice, and the wrong choice is fatal. The Cooper Industries / Atlantic Research / Guam line has generated a genuine minefield: a company that "voluntarily" cleans up and sues under § 107 may find a court holding that its administrative settlement actually triggered § 113(f), whose three-year clock has now run. Diagnose the claim before you spend, calendar the deadline the day you settle, and plead in the alternative. The pleading mechanics are in Drafting a Federal Civil Complaint: A Practical Checklist, and the valuation and proof of the recovery you are chasing is treated in The Litigation Damages Toolkit: Valuing and Proving Money Awards.

A currency note. EPA's designation of PFOA and PFOS as CERCLA hazardous substances (final rule, 2024) opened a new front — PFAS-driven PRP notices at sites that were previously closed or that never involved classic Superfund waste streams. This area is moving fast, is the subject of active litigation and enforcement-discretion policy, and should be confirmed against current agency guidance before you rely on any statement of it, including this one.

Common Mistakes to Avoid

  1. Ignoring a general notice letter. No penalty attaches, so companies file it. Meanwhile the PRP group forms, the allocation methodology is chosen, and the orphan share is assigned — all without you in the room.
  2. Treating a § 104(e) request as optional or negotiable in silence. It is compulsory process with per-day civil penalties. Negotiate scope openly and on the record; never narrow quietly.
  3. Letting a business person talk to EPA. Every casual overstatement becomes an admission. Counsel or a designated single point of contact, always.
  4. Purging old files. The 40-year-old shipping manifests are simultaneously your worst evidence and your only defense. Destroying them guarantees you get the surrogate estimate instead of the real number.
  5. Assuming "it was legal then" is a defense. CERCLA is retroactive. It is not a defense. It is not even a mitigating factor.
  6. Confusing apportionment with allocation. Divisibility under Burlington Northern is a liability defense with the burden on you; equitable allocation under § 113(f) is a separate, later, discretionary exercise.
  7. Failing to tender to historical CGL policies. Pre-1986 occurrence policies are frequently the largest asset in the matter and are lost through late notice or records destruction.
  8. Accepting arranger status by reflex. Burlington Northern requires intentional steps to dispose. A product sale is not automatically an arrangement for disposal.
  9. Naming the parent because it is on the letterhead — or conceding when EPA does. Bestfoods requires direct operation of the facility.
  10. Negotiating the "interim" cost share casually. Interim shares become final shares more often than anyone admits.
  11. Missing the § 113(g) limitations period on contribution. Three years from the settlement or judgment. It runs quietly and it runs fast.
  12. Settling without reading "matters addressed." Contribution protection is the whole product. A narrow "matters addressed" clause means you paid for very little.
  13. Assuming the defenses are self-executing. BFPP and innocent-landowner status are lost by failing continuing obligations after closing.
  14. Forgetting that the United States may be a PRP. At former defense-production and federal-contractor sites, the federal share can be very large — and nobody will volunteer it.

The Consolidated PRP Response Checklist

First 72 hours

  • [ ] Identify the letter type (general notice / special notice / § 104(e) / UAO) and calendar every deadline.
  • [ ] Issue a written litigation hold; suspend all records destruction, including the retention schedule.
  • [ ] Notify every potentially responsive insurance carrier, on every historical policy year.
  • [ ] Designate a single point of contact for EPA and instruct the business not to communicate directly.

First 30 days

  • [ ] Contact the EPA case attorney; negotiate scope and any extension, on the record.
  • [ ] Retain environmental counsel and a technical consultant.
  • [ ] Launch insurance archaeology for pre-1986 occurrence CGL policies.
  • [ ] Begin site-connection reconstruction: manifests, purchasing ledgers, transporter contracts, plant records.
  • [ ] Interview retirees and former plant personnel.

First 60–90 days

  • [ ] Serve a truthful, complete, carefully scoped § 104(e) response; index and preserve the production.
  • [ ] Determine your PRP class(es) and test Burlington Northern arranger intent and Bestfoods operator limits.
  • [ ] Screen the § 107(b) defenses, innocent landowner, BFPP, and contiguous-property protections.
  • [ ] Screen the de micromis exemption (§ 107(o)) and de minimis settlement (§ 122(g)) exits.
  • [ ] Join the PRP group under a written common-interest agreement; negotiate the participation agreement.

Months 3–12

  • [ ] Build the volumetric and toxicity-weighted allocation model with your consultant.
  • [ ] Fight over the denominator, the orphan share, and the federal share.
  • [ ] Evaluate ASAOC, consent decree, or de minimis cashout; price the contribution protection.
  • [ ] Read "matters addressed" and every reopener before signing anything.
  • [ ] Pursue coverage litigation or negotiation with carriers in parallel.

Ongoing

  • [ ] Preserve and calendar contribution claims under § 113(f) and the § 113(g) limitations periods.
  • [ ] Ensure any privately incurred response costs are NCP-consistent (40 C.F.R. Part 300).
  • [ ] Maintain BFPP/innocent-landowner continuing obligations if you rely on them.
  • [ ] Monitor remedy selection and build the administrative record for any eventual APA challenge.

Primary Authority

Statutes

  • CERCLA § 104(e), 42 U.S.C. § 9604(e) — information gathering and access; civil penalties for noncompliance (dollar amounts inflation-adjusted; see 40 C.F.R. Part 19).
  • CERCLA § 106, 42 U.S.C. § 9606 — abatement actions and unilateral administrative orders; § 106(b)(1) penalties.
  • CERCLA § 107(a), 42 U.S.C. § 9607(a) — the four classes of potentially responsible parties.
  • CERCLA § 107(b), 42 U.S.C. § 9607(b) — act of God, act of war, and third-party defenses.
  • CERCLA § 107(c)(3), 42 U.S.C. § 9607(c)(3) — punitive damages up to three times response costs for failure to comply with a § 106 order without sufficient cause.
  • CERCLA § 107(o)–(r), 42 U.S.C. § 9607(o)–(r) — de micromis exemption; municipal solid waste exemption; contiguous property owner protection; bona fide prospective purchaser limitation on liability.
  • CERCLA § 101(20), (35), (40), 42 U.S.C. § 9601(20), (35), (40) — "operator"; "contractual relationship" / innocent landowner; "bona fide prospective purchaser."
  • CERCLA § 113(f), 42 U.S.C. § 9613(f) — contribution; § 113(f)(2) contribution protection for settling parties; § 113(f)(3)(B) post-settlement contribution.
  • CERCLA § 113(g), 42 U.S.C. § 9613(g) — limitations periods for cost recovery and contribution.
  • CERCLA § 113(h), 42 U.S.C. § 9613(h) — timing of review; bar on pre-enforcement review.
  • CERCLA § 122, 42 U.S.C. § 9622 — settlements; § 122(e) special notice and moratorium; § 122(g) de minimis settlements; § 122(h) cost recovery settlements.
  • Administrative Procedure Act, 5 U.S.C. § 706(2)(A) — arbitrary and capricious review.
  • 18 U.S.C. § 1001 — false statements to a federal agency.

Regulations

  • 40 C.F.R. Part 300 — National Contingency Plan; 40 C.F.R. § 300.700 (private-party response and NCP consistency).
  • 40 C.F.R. Part 312 — All Appropriate Inquiries (satisfied in practice by an ASTM E1527-compliant Phase I).
  • 40 C.F.R. Part 19 — EPA civil monetary penalty inflation adjustments (figures change annually; verify current amounts).
  • 40 C.F.R. Part 302 — designation of hazardous substances (including EPA's 2024 PFOA/PFOS designation; an evolving area — verify current status).

Cases

Secondary Sources

  • Restatement (Second) of Torts § 433A (apportionment of harm to causes) — the source of the CERCLA divisibility test.
  • EPA's Interim CERCLA Settlement Policy and its de minimis and de micromis settlement guidance (agency guidance, not binding law).
  • ASTM E1527 (Phase I Environmental Site Assessment standard practice), as recognized by EPA under 40 C.F.R. Part 312.

A note on accuracy — read this before you rely on anything above. Five categories in this checklist are moving targets or are not federal law at all, and each must be verified against current primary sources for your jurisdiction:

  1. Penalty amounts change every year. The dollar figures printed in CERCLA's text (including the § 104(e)(5) per-day penalty) are superseded annually by inflation adjustments under the Federal Civil Penalties Inflation Adjustment Act. Read the current figure in EPA's civil monetary penalty table at 40 C.F.R. Part 19, never the number in the statute.
  2. The de micromis thresholds and cutoff date are precise statutory numbers. Read the current text of § 107(o) in the U.S. Code rather than any secondary paraphrase, including this one.
  3. Insurance coverage doctrine is state law and states genuinely diverge. The construction of the "sudden and accidental" pollution exclusion, the trigger of coverage, allocation across triggered years (all-sums versus pro rata), exhaustion (horizontal versus vertical), and whether a PRP letter is itself a "suit" invoking the duty to defend are all decided under the law of a particular state, and the answers differ materially between, say, California, New Jersey, and Texas. Montrose is California law and nothing more. There is no nationwide rule here; do not assume one.
  4. The state-law tort claims that travel alongside a CERCLA matter — nuisance, trespass, negligence, restoration damages — are likewise state law, with real divergence in elements, damages measures, and limitations periods. Confirm the forum state's rule.
  5. PFAS is in motion. EPA's 2024 CERCLA hazardous-substance designation of PFOA and PFOS is the subject of active litigation and evolving enforcement-discretion policy. Confirm its current status before relying on any statement of it.

One currency point on administrative law is worth repeating because it is frequently gotten wrong: Chevron deference no longer exists. Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024), overruled Chevron U.S.A. Inc. v. Natural Resources Defense Council, 467 U.S. 837 (1984). Courts now interpret CERCLA and its regulations de novo, giving an agency's reasoning only the Skidmore-style weight its persuasiveness earns. Any source that tells you EPA's legal interpretation of CERCLA is entitled to binding deference is out of date.

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This checklist is general legal information from UpLaw (uplaw.us), not legal advice, and does not create an attorney-client relationship. Laws vary by state and change over time; verify current requirements and consult qualified counsel before acting.