Environmental Investigation Settlements: Penalties and Consent Decrees

Environmental investigation settlements are how the federal government closes out pollution cases: after the EPA inspects a facility and documents violations, the matter is resolved either through an in-house administrative order or through a court-approved consent decree negotiated with the Department of Justice. The deal almost always combines a cash penalty with a legally binding requirement to fix the problem. In fiscal year 2025, the EPA concluded 2,127 civil enforcement cases and assessed over $1.2 billion in penalties, fines, and restitution, along with $6.4 billion in commitments to bring facilities back into compliance.¹

How a Case Gets to the Settlement Table

The road to a settlement starts with an inspection. The EPA’s authority to enter facilities, run tests, and demand records is written into each environmental statute; under Section 114 of the Clean Air Act, for example, inspectors can show up at any entity, not just known pollution sources.² In FY2025, the agency conducted nearly 8,300 inspections and more than 14,000 compliance monitoring activities, both among the highest totals in recent years.³

When inspectors find a problem, the agency has choices. It can send a notice of violation. It can issue an administrative compliance order telling the company to fix the issue, usually within a year. Or, for more serious cases, it can refer the matter to the Department of Justice for civil litigation or criminal prosecution.

Two features of civil environmental liability matter for anyone facing one of these cases. Liability is strict, meaning a violation triggers liability regardless of whether the company knew about the rule or meant to break it. And the government’s burden is preponderance of the evidence, the same “more likely than not” standard used in most civil litigation.⁴ Together those features explain why most cases settle: once the EPA has documented a violation, there is usually little legal upside to fighting over whether it happened.

Administrative Settlements vs. Consent Decrees

Once a violation is on the table, resolution travels one of two paths. Severity, penalty size, and the violator’s willingness to cooperate drive the choice.

Administrative Settlements

Smaller or routine cases stay inside the EPA. The usual instrument is a consent agreement and final order: a negotiated deal in which the violator agrees to pay a penalty and correct the problem. Administrative compliance orders can also be imposed unilaterally. These proceedings are faster and cheaper than going to court, which is why the agency uses them for the bulk of its caseload.²

Judicial Settlements and Consent Decrees

Bigger cases get referred to the DOJ, which files suit in federal court. Most of these judicial cases settle before trial through a consent decree, a written agreement approved by a judge that binds all parties.⁵ Congress has required consent decrees for certain cases, including final Superfund cleanup actions, because they give the court continuing jurisdiction. If a party breaches the agreement, the other side goes back to the same judge instead of starting a new lawsuit.⁶

A proposed consent decree is not final when the parties sign it. It must be published for a 30-day public comment period so affected communities and other stakeholders can respond.⁷ After comments close, the court can approve, modify, or reject it. Once entered, the decree can be modified later only on a showing of significant changes in facts or law, under the standard the Supreme Court set in Rufo v. Inmates of Suffolk County Jail (1992).⁸

The DOJ’s Environmental Enforcement Section, inside the Environment and Natural Resources Division, handles these cases. It maintains over 1,500 active matters and recovers more than $1 billion annually in pollution control and cleanup commitments plus over $100 million in monetary judgments.⁹ Every settlement requires sign-off from both the Assistant Attorney General for ENRD and EPA enforcement leadership.

What Environmental Settlements Contain

A federal environmental settlement is rarely just a check. Defendants generally do not have to admit wrongdoing, but they do have to accept a package of obligations.⁴ The core pieces:

Civil penalties. Cash payments meant to punish the violation, strip away any financial advantage from noncompliance, and deter future conduct. Penalties go to the U.S. Treasury.
Injunctive relief. Mandatory corrective action, such as installing pollution controls, stopping illegal discharges, or redesigning operations to meet regulatory standards.
Mitigation measures. Steps to reduce or offset harm already done, including environmental restoration and monitoring.
Supplemental environmental projects. Voluntary projects the violator agrees to perform beyond what the law requires, such as retrofitting school buses or funding neighborhood air monitors, in exchange for a reduction in the cash penalty.

How Penalties Are Calculated

The EPA starts with the statutory maximum penalty for the violation, which is adjusted annually for inflation; the most recent inflation adjustment rule was issued on January 8, 2025.¹⁰ From there, enforcement staff work through the seriousness of the violation, the company’s compliance history, how long the violation lasted, and any good-faith efforts to comply.

A central piece of the math is the economic benefit analysis, run through the EPA’s BEN model. BEN estimates what the company saved or earned by not complying on time, using after-tax cash flow analysis to compare the cost of timely compliance against what the violator actually spent. It accounts for delayed capital spending, avoided operating costs, inflation, and the time value of money.¹¹ The policy point behind the model is that a violator should not profit from breaking the law. Companies can submit financial records to argue they cannot pay the full penalty, and the EPA may agree to a payment plan or let an SEP absorb some of the cash amount.¹⁰

What’s Happening to SEPs

If you are reading a settlement from before 2025 and expecting to see a supplemental project, know that the policy has changed. Research covering 1997 to 2017 found the public generally prefers in-kind projects to straight cash penalties, and that stock markets react more positively to settlements that include them.¹² The same research found that the largest share of in-kind settlements landed in wealthier and whiter communities, not in the environmental justice areas they were meant to help.¹³

SEPs have also been a political back-and-forth. The first Trump administration banned them. The Biden administration restored them through a 2022 interim final rule. On February 5, 2025, the DOJ rescinded that guidance, with the Attorney General signaling an intent to eliminate what the administration described as “illegal or improper” payments to non-governmental third parties who were neither victims nor parties to the lawsuits.¹⁴ Future federal settlements are much less likely to include community-directed projects.

Superfund Settlements Follow Their Own Rules

Cleanup of hazardous waste sites under CERCLA runs on a different track. Liability extends broadly to current and former property owners, companies that arranged for waste disposal, and transporters. The EPA follows an “enforcement first” policy: make responsible parties pay for and perform the cleanup rather than drawing on public funds.¹⁵

Investigation at a Superfund site moves in stages: a preliminary assessment, a site investigation with sampling, an evaluation for the National Priorities List, and finally a remedial investigation and feasibility study that defines the contamination and lays out cleanup options.¹⁶ Negotiation opens with a general notice letter telling potentially responsible parties they are on the hook, followed by a special notice letter signaling the EPA is ready to negotiate. The parties then have 60 days to submit a good-faith offer. If they do not, the EPA can issue a unilateral administrative order forcing the work, or the agency can perform the cleanup itself and sue to recover costs later.¹⁵

In FY2025, the EPA finalized 65 Superfund enforcement instruments valued at more than $888 million, including $714.3 million to address nearly 59.4 million cubic yards of contaminated land and water and $174.1 million to reimburse the agency for past cleanup work.³

What Recent Settlements Actually Look Like

A few recent cases show how the pieces fit together in practice.

Hino Motors, $1.6 Billion (January 2025)

The largest environmental enforcement action of FY2025 targeted Hino Motors, a Toyota subsidiary, for a decade-long scheme to falsify emissions test data on heavy-duty diesel engines. Between 2010 and 2022, Hino imported and sold more than 105,000 non-conforming engines, with engineers altering results, fabricating data, and concealing software functions that affected emission controls. In January 2025, the EPA voided the emissions certificates for all affected engines, the largest voiding action in the agency’s history.¹⁷

The global resolution combined criminal and civil penalties totaling over $1.6 billion: a $521.76 million criminal fine, a $525 million civil penalty, and roughly $300 million in mitigation projects, including replacing locomotive and marine engines and recalling 2017–2019 trucks. Hino also received five years of probation, during which it cannot import any diesel engines it manufactures into the United States.¹⁸ The case started with the EPA’s own confirmatory testing and involved the EPA criminal division and the FBI.

Lower Duwamish Waterway, $668 Million (March 2026)

In March 2026, the EPA, DOJ, and the state of Washington reached a $668 million settlement with more than 100 potentially responsible parties to clean up the Lower Duwamish Waterway, a five-mile stretch of contaminated river in Seattle containing 41 hazardous substances, including PCBs, arsenic, dioxins, and carcinogenic compounds.¹⁹

The consent decree assigns the actual cleanup to the Lower Duwamish Waterway Group, made up of Boeing, the city of Seattle, and King County. They will receive about $130 million from other responsible parties and $140 million from federal agencies to fund dredging, capping, and habitat restoration. Construction in the upper reach began in fall 2024, with the middle and lower reaches to follow, and the full project is expected to take at least a decade. The decree is pending court approval after the 30-day public comment period.²⁰

Smaller Settlements Across Industries

Not every settlement runs into the hundreds of millions. FY2025 and early 2026 also produced:

Manitowoc Company: $42.6 million for importing over 1,000 cranes with falsely certified diesel engines.
Lowe’s: $12.5 million for lead paint renovation violations.
Costco: $3.1 million for illegally imported antimicrobial gloves and misbranded air filters.
A California couple sentenced to prison and ordered to forfeit $2.19 million for smuggling Mexican pesticides.³²¹

States run their own enforcement programs in parallel. The California Air Resources Board settled a $197 million case against Volvo Group North America in May 2026 over undisclosed auxiliary emission control devices in roughly 10,000 heavy-duty diesel engines, including $17.5 million in penalties, $71 million for air quality mitigation, and $108 million in emission reduction projects.²²

Citizen Suits as a Separate Path

Private parties can produce environmental settlements too. Nearly every major environmental statute includes a citizen suit provision letting individuals or organizations sue polluters directly or sue the EPA for failing to perform a mandatory duty.²³ Under the Clean Water Act, a plaintiff must give 60 days’ notice before filing and must allege an ongoing violation at the time of filing. Penalties can reach $55,801 per day per violation, and prevailing plaintiffs can recover attorney fees.²⁴

Citizen suit settlements typically require the defendant to come into compliance, fund a supplemental project or mitigation payment, reimburse the plaintiff’s legal costs, and sometimes grant the plaintiff access to the facility for future monitoring. Once a lawsuit is filed, any proposed settlement is reviewed by the EPA and DOJ for 45 days before it is finalized.²⁴ These suits act as a backstop when the government declines to pursue a case.

Why the Current Enforcement Climate Matters

FY2025’s numbers were strong, but the infrastructure behind them is being reduced. The Trump administration’s proposed FY2026 budget cuts total EPA funding by 54 percent, from $9.14 billion to $4.16 billion. Civil enforcement faces a 30 percent reduction, criminal enforcement a 49 percent cut, and compliance monitoring a 35 percent cut.²⁵ The agency has already reduced its workforce by roughly 3,000 employees, about 20 percent of staff, to around 12,700. The FY2027 proposal would cut funding by more than half again and trim 200 more positions.²⁶

The budget frames the shift as a “return to statutory enforcement and compliance work,” focused on “clear and substantial violations of the law that cause significant harm and that cannot be addressed by states.” In March 2025, the EPA issued guidance to review and revise its national enforcement priorities to match that direction.²⁵ Because both the EPA and DOJ have broad discretion over which cases to pursue, the effect is already visible regardless of whether Congress ultimately approves the cuts.

One boundary worth flagging: environmental justice is no longer a settlement priority. In April 2025, the DOJ terminated a Biden-era civil rights settlement over wastewater conditions in Lowndes County, Alabama, and in February 2026 Attorney General Pam Bondi rescinded the directive that had prioritized environmental justice enforcement. The proposed FY2026 EPA budget eliminates environmental justice enforcement funding entirely.²⁷²⁸ If you are expecting a federal settlement to carry community-benefit terms on that basis, that framing is no longer in play.

1
EPA. Enforcement and Compliance Assurance Annual Results Fiscal Year 2025
2
4cleanair.org. The Enforcement Process
3
EPA. FY25 Annual Report on Enforcement and Compliance
4
EPA. Basic Information on Enforcement
5
Cornell Law Institute. Consent Decree
6
Vermont Journal of Environmental Law. Protecting Environmental Consent Decrees
7
EPA. Proposed Consent Decrees and Draft Settlement Agreements
8
Justia. Rufo v. Inmates of Suffolk County Jail, 502 U.S. 367
9
DOJ. Environmental Enforcement Section
10
EPA. Enforcement Policy Guidance Publications
11
Federal Register. Calculation of the Economic Benefit of Noncompliance in EPAs Civil Penalty Enforcement Cases
12
CEPR. How to Punish Corporate Environmental Violations: The Merits of In-Kind Settlements
13
Resources for the Future. Addressing Environmental Justice Through In-Kind Court Settlements
14
Harvard Law School Environmental and Energy Law Program. DOJ Issued Interim Final Rule to Allow Supplemental Environmental Projects
15
EPA. Negotiating Superfund Settlements
16
EPA. Comprehensive Environmental Response, Compensation, and Liability Act and Federal Facilities
17
EPA. Hino Motors Clean Air Act Settlement Summary
18
DOJ. Hino Motors, Toyota Subsidiary, Agrees to Plead Guilty and Pay Over $1.6B to Resolve Emissions Fraud
19
EPA. EPA Reaches $668M Settlement Agreement for Continued Cleanup of Lower Duwamish Waterway
20
Federal Register. Notice of Lodging of Proposed Consent Decree Under CERCLA
21
EPA. Civil and Cleanup Enforcement Cases and Settlements
22
California Air Resources Board. California Settles Certification and Emissions Violations Case With Volvo Group North America
23
EPA. Notices of Intent to Sue the U.S. Environmental Protection Agency
24
Smith, Gambrell & Russell. Negotiating Resolution of CWA Citizen Suits and 60-Day Notice Letters
25
EPA. FY 2026 EPA Budget in Brief
26
Federal News Network. EPA Producing Less Scientific Research After 20% Staffing Cut
27
DOJ. Department of Justice Terminates Environmental Justice Settlement Agreement
28
Alabama Daily News. DOJ Ends Environmental Justice Agreement in Alabama County