CERCLA (Superfund Law): Liability, Cleanup and the National Priorities List

1980

enacted as Public Law 96-510

42 U.S.C. Chapter 103

codified at 42 U.S.C. §§ 9601-9675

EPA

implements most of the Superfund program

Section 107(a)

main liability provision

NPL

National Priorities List for priority remedial sites

2024 PFAS rule

PFOA and PFOS designated as hazardous substances

CERCLA at a glance: the statute grid

This is the standard statute grid used on Field & Statute for federal environmental laws. Each row gives the property, the current value, and the primary source. The latest change reflected here is EPA’s 2024 final rule designating PFOA and PFOS, including their salts and structural isomers, as hazardous substances under CERCLA.

Two rows matter more than the rest. CERCLA is a liability and cleanup statute, not an ordinary permit program. And the hazardous-substance list changed in 2024 for PFOA and PFOS. That does not turn every PFAS issue into a CERCLA case, but it does bring those two chemicals into the statute’s release, reporting, response, and cost-recovery framework when the legal thresholds are met.

What CERCLA does, and what Superfund means

CERCLA is about response. Under 42 U.S.C. § 9604(a)(1), the President may respond when a hazardous substance is released or substantially threatens release. The statute separately authorizes response to a release or substantial threat of release of a pollutant or contaminant that may present an imminent and substantial danger to public health or welfare. Those response authorities are implemented through federal delegations and the National Contingency Plan, the official roadmap for the program.

The statute defines “release” broadly in 42 U.S.C. § 9601(22): spilling, leaking, pumping, emitting, discharging, escaping, leaching, dumping, and disposing all fit the definition.

“Superfund” is the common name for the cleanup program built around CERCLA. That name is useful, but it can blur the statute’s structure. CERCLA is not only a federal fund. It also gives the federal government tools to order work, settle with responsible parties, perform response work itself, and recover costs after the fact. In practice, the agency may ask for an information request, review records, or issue an official letter before moving to a formal enforcement step.

The statute is aimed at contamination and cleanup, not ordinary waste handling on its own. If the issue is how waste is being generated, stored, treated, or disposed of now, RCRA may be the better fit. CERCLA comes into focus when the question is release, cleanup, and who pays.

Who pays under CERCLA: the four PRP classes

Section 107(a), 42 U.S.C. § 9607(a), identifies four classes of potentially responsible parties, usually called PRPs. “Potentially” is not a throwaway word. It marks the group that may be liable under the statute, but actual liability still depends on defenses, causation, apportionment, settlements, and the facts at the site.

CERCLA liability is often called strict liability. That means the government does not have to prove negligence in the ordinary sense, although statutory defenses still matter. Section 107(b), 42 U.S.C. § 9607(b), lists defenses for releases caused solely by an act of God, an act of war, or certain acts or omissions of a third party, if the statutory conditions are met. The word “solely” does real work there.

Courts also treat CERCLA as a statute that can lead to joint and several liability when the harm is not divisible. That does not mean every defendant pays everything automatically. Burlington Northern, decided in 2009, confirmed that apportionment can be available when the record provides a reasonable basis to divide the harm.

Cost recovery and contribution are related, but they are not the same remedy. Section 107(a), 42 U.S.C. § 9607(a), supports cost-recovery claims for response costs. Section 113(f), 42 U.S.C. § 9613(f), governs contribution in specified settings. Cooper Industries held in 2004 that section 113(f)(1) contribution requires a civil action under section 106 or 107(a). Atlantic Research held in 2007 that a private party that incurred its own cleanup costs may sue under section 107(a) to recover those costs from other PRPs.

The short version is blunt: CERCLA asks who fits section 107(a), what response costs were incurred, and whether any defense, settlement rule, or apportionment theory changes the result.

How cleanup works: removal, remedial action and the NPL

CERCLA uses “response” as the umbrella term. Section 101, 42 U.S.C. § 9601, defines response to include removal and remedial action. That split helps make sense of the cleanup path.

A removal action is the faster response. It can address urgent conditions, stabilize a release, reduce exposure, or take other short-term steps allowed under the statute and the National Contingency Plan. Removal is not limited to sites on the National Priorities List, and it can be used in an emergency.

A remedial action is the longer path. It usually involves more study, remedy selection, and implementation. At major sites, EPA often uses a remedial investigation and feasibility study, or RI/FS. The remedial investigation describes the nature and extent of contamination. The feasibility study compares cleanup options. EPA then selects a remedy through the CERCLA process and the National Contingency Plan at 40 CFR Part 300.

A simple sequence looks like this:

1. A release or threatened release is identified.
2. EPA or another authorized agency assesses the site.
3. The response path may be removal, remedial action, or both.
4. If the site warrants national priority status, EPA may list it on the National Priorities List.
5. Cleanup, enforcement, settlement, cost recovery, and long-term controls may follow.

The National Priorities List, or NPL, is not a list of every contaminated site in the country. It is the list in Appendix B to 40 CFR Part 300 of releases that appear to warrant further remedial action under the National Contingency Plan. A site can have CERCLA activity without being on the NPL. Listing also does not settle every liability question by itself. Liability still turns on the statute, the facts, and the parties.

EPA’s enforcement tools include administrative orders, settlements, consent decrees, and cost-recovery actions. The Department of Justice may represent the United States in federal litigation. When responsible parties cannot be found, cannot pay, or do not act, the federal government may perform or fund response work under CERCLA authority, then seek recovery where the statute allows. That enforcement and compliance path is one reason the statute is read alongside agency practice, not as a static text.

The 2024 PFAS update: PFOA and PFOS became CERCLA hazardous substances

EPA’s 2024 PFAS final rule added two PFAS compounds to CERCLA’s hazardous-substance list: PFOA and PFOS, including their salts and structural isomers. EPA published the rule at 89 Fed. Reg. 39124 on May 8, 2024. It became effective July 8, 2024.

This page reflects that change because CERCLA’s cleanup and liability system depends in part on what counts as a hazardous substance. Section 101(14), 42 U.S.C. § 9601(14), defines the term by cross-reference and designation. EPA used CERCLA section 102(a), 42 U.S.C. § 9602(a), to designate PFOA and PFOS.

What changes is the legal status under CERCLA. A release of PFOA or PFOS may trigger reporting duties when a reportable quantity is met. EPA response authority can apply when the statutory conditions are present. Cost recovery and enforcement questions can also arise.

The rule does not mean that every detection of PFOA or PFOS produces the same CERCLA outcome. The statute still requires a release, a threshold, a response question, and a liability analysis. That is true whether the issue appears in a company letter, a cleanup review, or a public information request.

We are not using the 2024 rule as a general PFAS health explainer. The point here is narrower and date-specific: PFOA and PFOS are now CERCLA hazardous substances, and that changes the release-response framework for those compounds.

What CERCLA is not: no ordinary permit program

CERCLA is primarily a cleanup, response, and liability statute. It does not work like the Clean Water Act’s NPDES permit program, and it does not operate like RCRA’s hazardous-waste treatment, storage, and disposal permit system.

That boundary clears up two common mistakes. First, “CERCLA regulations” does not mean CERCLA creates a routine operating permit. The main regulations are response and cleanup rules, especially the National Contingency Plan at 40 CFR Part 300, plus hazardous-substance designation, reportable-quantity and notification rules at 40 CFR Part 302.

Second, “CERCLA compliance” usually means compliance with cleanup orders, settlement terms, reporting duties, or response obligations, not holding a general CERCLA permit.

RCRA and CERCLA can both matter at the same facility, but they ask different first questions. RCRA asks how waste is managed now. CERCLA asks what release occurred, what response is needed, and who can be made to pay.

Federal, state, tribal and federal-facility roles

EPA implements much of the Superfund program, but CERCLA does not sit on a single desk. The President’s response authorities are delegated through the federal government, and the National Contingency Plan assigns lead-agency roles for different kinds of releases and facilities.

The Department of Justice may handle federal court litigation for the United States when enforcement, cost recovery, or settlement approval requires it.

States also have roles. Some come from CERCLA itself, some from cooperative agreements, and some from state cleanup laws that run alongside the federal program. Tribal governments can have roles where releases affect tribal lands, resources, consultation interests, or other legally recognized concerns.

Federal facilities are not outside CERCLA. EPA treats them as a major category because military bases, energy facilities, and other federal properties can have contamination subject to CERCLA response and cleanup requirements. The federal government can be a regulator, a land manager, and in some settings a responsible party.

The vocabulary stays the same: release, facility, hazardous substance, response action, liability.

Key cases that shape CERCLA liability

These Supreme Court cases anchor the liability rules discussed above. Each one sits close to a statutory section.

Bestfoods is the corporate-structure case. Cooper Industries and Atlantic Research draw the line between contribution and cost recovery. Burlington Northern matters for two recurring questions: when a party arranged for disposal, and when a court may divide responsibility instead of imposing joint and several liability for the whole harm.

Compared with neighboring environmental laws

CERCLA sits next to statutes that regulate different points in the pollution cycle.

This is not a ranking. It is a way to avoid using CERCLA as a catchall label for every environmental problem. The statute has a specific job: response to releases and threatened releases, plus liability for cleanup and related costs.

Common questions about CERCLA

Collection path

Federal Environmental Laws > Federal Environmental Laws > CERCLA. Neighboring topics for the next reading step are RCRA, for current hazardous-waste management, and What Is a Superfund Site?, for how a contaminated site moves through assessment, NPL listing, remedy selection, cleanup, and cost recovery.