Federal environmental enforcement this week was dominated by a Justice Department civil complaint against the District of Columbia Water and Sewer Authority over the January collapse of the Potomac Interceptor — a failure that flushed more than 200 million gallons of raw sewage into the Potomac River. The DC Water case sits at the top of an active docket that also includes a $102.5 million Kroger settlement over ozone-depleting refrigerants, a federal Clean Air Act indictment of a Puerto Rico incinerator operator, and the Justice Department’s expanding campaign against state-level climate litigation.
1. DC Water Sued Over 200-Million-Gallon Sewage Discharge to the Potomac
The Justice Department, on behalf of the U.S. Environmental Protection Agency, filed a civil Clean Water Act complaint on April 20, 2026 against the District of Columbia Water and Sewer Authority and the District of Columbia, seeking penalties, sewer rehabilitation, and pollutant mitigation tied to the January collapse of the Potomac Interceptor sewer line. Court filings indicate the collapse occurred on January 19, 2026, where the interceptor passes through C&O Canal National Historic Park near Lock 12 in Montgomery County, Maryland, and resulted in the unauthorized discharge of more than 200 million gallons of untreated sewage to the Potomac River.
Records suggest the Potomac Interceptor normally conveys an average of up to 60 million gallons of sewage per day from parts of Northern Virginia, the District of Columbia, and Maryland to the Potomac Pump Station in Washington. According to the complaint, DC Water attempted to bypass the failed section by installing diversion pumps and temporarily containing flow in the C&O Canal, but high-powered pumps repeatedly clogged on rags and wipes. On February 8, DC Water reported that an estimated 500,000 gallons of sewage was discharged when multiple pumps had to be taken offline. President Trump declared a FEMA emergency, and the Army Corps of Engineers deployed to assist with mitigation.
The complaint, filed by the Environmental Enforcement Section of the Justice Department’s Environment and Natural Resources Division (ENRD), seeks financial penalties and an order requiring DC Water to develop an Enhanced Operations and Maintenance Plan for all of its sewer lines. Principal Deputy Assistant Attorney General Adam Gustafson said in a statement that aging infrastructure must be properly maintained to “prevent such catastrophes.” The case is the largest federal Clean Water Act enforcement action filed against a major U.S. municipal utility so far in 2026, and TIJ will continue tracking penalty negotiations and any subsequent consent decree.
2. Kroger Agrees to $102.5 Million Clean Air Act Settlement Over Refrigerant Leaks
The Justice Department announced a proposed consent decree on April 29, 2026 with The Kroger Company resolving alleged Clean Air Act violations across the grocery chain’s nationwide footprint. Under the settlement filed in the U.S. District Court for the Southern District of Ohio, Kroger will spend an estimated $100 million over three years to reduce coolant leaks and improve compliance with stratospheric-ozone protection rules, and will pay a $2.5 million civil penalty.
EPA filings allege Kroger failed to promptly repair refrigeration equipment leaks of R-22, a hydrochlorofluorocarbon (HCFC) refrigerant, between 2014 and 2023, and failed to keep adequate service records. If entered by the court, the settlement requires Kroger to retrofit or replace 600 large commercial refrigeration systems and to implement a refrigerant management program keeping the company-wide leak rate at or below 9.5 percent per year. The proposed consent decree is subject to a 30-day public comment period.
For TIJ readers tracking the cost of compliance, the Kroger case is a useful market signal. Even after R-22 was phased out for new equipment, the existing service base in large grocery, cold-storage, and food-processing facilities remains a recurring enforcement target. The $100 million capital commitment dwarfs the headline penalty by a 40-to-1 ratio — a pattern increasingly common in Clean Air Act settlements where injunctive relief, not fines, drives the real cost of resolution.
3. Puerto Rico Incinerator Operator Indicted for Conspiracy to Violate the Clean Air Act
A federal grand jury in San Juan returned an indictment on May 1, 2026 charging Ramon Plaza-Gregory, Ileana Cortes-Gonzalez, and Mo-Na-Co Biomedical & Environmental Corp. (“Monaco”) with five counts of violating the Clean Air Act and one count of conspiracy. The charges relate to emissions from Monaco’s commercial pathological-waste incinerator in Aguadilla, Puerto Rico.
According to the indictment, Monaco was permitted to incinerate pathological waste subject to limits on materials burned and emissions released. Filings indicate that starting in August 2021, the operators burned unpermitted materials, used malfunctioning equipment, and exceeded emissions limitations. After being warned by an EPA inspector, Plaza-Gregory allegedly began operating the incinerator on weekends and holidays. EPA documented further emissions violations in July 2024, and Monaco’s emissions permit expired in September 2024 — yet the indictment alleges the defendants continued to operate the incinerator on weekends, causing emissions, until at least April 2026.
If convicted, the individual defendants face a maximum of five years in prison and $250,000 in fines for each charge; Monaco faces a maximum of $500,000 in fines per charge. The indictment is an allegation only, and the defendants are presumed innocent. The case was investigated by EPA’s Criminal Investigation Division and the FBI’s San Juan Field Office, and is being prosecuted by the Environmental Crimes Section of ENRD. EPA Assistant Administrator for Enforcement and Compliance Assurance Jeffrey A. Hall stated that the company “deliberately concealed these violations by failing to record basic information about what was being burned.”
4. Cleveland-Cliffs to Spend $12 Million on Corrective Measures at Ohio Steel Mill
On April 28, 2026, the Justice Department announced a proposed settlement with Cleveland-Cliffs Steel Corporation requiring at least $12 million in corrective measures to address releases of hazardous waste at the company’s Middletown Works integrated steel facility in Butler County, Ohio. The settlement resolves alleged violations of the Resource Conservation and Recovery Act (RCRA) tied to historic groundwater and soil contamination at one of the country’s largest carbon-steel mills.
The Middletown Works site has more than a century of industrial use, and RCRA corrective action there has involved investigation and remediation of constituents that records indicate include benzene, polycyclic aromatic hydrocarbons, and heavy metals. The proposed consent decree requires Cleveland-Cliffs to undertake additional corrective measures and monitoring; TIJ has filed a request for the consent decree’s detailed corrective-measures implementation plan and will report further detail when the document is publicly lodged.
5. Auto-Parts Manufacturer Sentenced; General Manager Gets Home Confinement
On April 17, 2026, GOTEC Plus Sun LLC, a Delaware-organized auto-parts manufacturer that operated in Williamstown, Kentucky, was sentenced to pay a $275,000 fine and serve one year of probation after pleading guilty to illegal storage of hazardous waste under RCRA. Earlier, on March 30, 2026, former general manager Natalie Fehse was sentenced to five years of probation, including ten months of home confinement, and a $5,000 fine for her role.
Court filings indicate the Kentucky Department of Environmental Protection inspected GOTEC’s plant on June 27, 2024 and discovered semi-trailers, shipping containers, and an abandoned warehouse containing 249 fifty-five-gallon drums of hazardous waste, plus approximately 27 cubic yards of additional waste stored in cardboard, wooden crates, and yellow totes. GOTEC admitted that between January 2022 and November 2024 it failed to properly dispose of waste generated by its coating and adhesive operations, citing staffing shortages and pandemic-era revenue declines.
The GOTEC sentencing is a useful data point on EPA’s “cooperative federalism” enforcement model under the second Trump administration. The Kentucky Department for Environmental Protection found the violations during a routine inspection; EPA’s Criminal Investigation Division provided the forensic and investigative resources that turned the matter into a federal felony case. Expect more state-led inspections feeding federal criminal referrals in 2026.
6. Justice Department Sues Minnesota Over State Climate Litigation
On May 4, 2026, the Justice Department filed a complaint in the U.S. District Court for the District of Minnesota challenging the state’s effort to regulate global greenhouse gas emissions through state-court litigation against energy companies. The filing advances an April 2025 presidential executive order directing the Justice Department to “protect American energy from state overreach.”
The complaint argues that Minnesota’s state-court suit — which seeks to enjoin global energy production and disgorge profits — is preempted by federal law and the Clean Air Act. Associate Attorney General Stanley Woodward said in a statement that Minnesota’s approach “undermines affordable and reliable American energy.” ENRD filed parallel complaints against Hawaii, Michigan, New York, and Vermont in 2025 over similar climate suits. The Minnesota case has implications beyond the immediate parties: a ruling in favor of the United States could constrain the rapidly growing wave of state and municipal climate-tort litigation, while a ruling against the federal government would entrench a state-court path to regulating global emissions.
7. Public Agencies on the Hook: EPA Proposes $20,000 CWA Penalty Against Maryland Prison System
In April 2026, EPA proposed a $20,000 penalty against the Maryland Department of Public Safety and Correctional Services to resolve alleged Clean Water Act violations involving the Municipal Separate Storm Sewer System (MS4) at the Jessup Correctional Facility in Jessup, Maryland. The proposed Consent Agreement and Final Order is small in dollar terms, but it confirms a point that compliance counsel often miss: EPA’s enforcement authority applies to state and local government facilities, not only private industry.
Public-sector enforcement of MS4 obligations has historically been quieter than industrial cases, but records suggest correctional facilities, transportation departments, and public utilities are appearing more frequently on EPA dockets. TIJ will track whether a public-sector enforcement pattern emerges as state agencies face the same NPDES, MS4, and SPCC requirements as the private firms they regulate.
8. Regulatory Watch: North Carolina Vehicle Emissions Testing and RCRA Definition Withdrawn
Two regulatory developments from earlier this week round out the picture. On May 8, 2026, EPA proposed to approve North Carolina’s request to remove vehicle inspection and maintenance — emissions testing — from the State Implementation Plan for the remaining 19 counties where it still applies. The North Carolina Department of Transportation has stated the change would save state drivers nearly $20 million annually in inspection fees. Public comment will determine whether downwind air-quality impacts are deemed significant.
Separately, EPA on May 8, 2026 withdrew a proposed rule that would have expanded the RCRA definition of hazardous waste applicable to corrective action to include any substance meeting the statutory definition, not only listed wastes. The agency stated that, after reexamining the proposal, the changes “would have complicated existing RCRA regulations.” The withdrawal is meaningful for facilities undergoing corrective action: it preserves the narrower regulatory definition that most industry compliance programs are built around.
Patterns and What TIJ Is Watching
This week’s docket shows three patterns worth flagging. First, infrastructure-failure cases (DC Water) are becoming a high-dollar enforcement vector as municipal sewer systems age and capital-replacement schedules slip. Second, capital-heavy injunctive settlements (Kroger, Cleveland-Cliffs) continue to dominate civil resolutions — penalty headlines understate the true cost of compliance. Third, EPA’s criminal program is leaning heavily on state-led inspections (GOTEC, Monaco) to surface cases that warrant federal felony charges.
Three threads warrant deeper TIJ investigation in the weeks ahead: the DC Water consent-decree negotiation and whether Northern Virginia ratepayers ultimately bear the cost of the Potomac Interceptor failure; the Cleveland-Cliffs corrective-measures plan once it is publicly lodged, particularly with respect to groundwater migration; and the federal preemption argument in the Minnesota climate-litigation case, which could reshape the entire state-tort climate docket.
Sources and case documents: DC Water complaint (DOJ, April 20, 2026); Kroger settlement (DOJ, April 29, 2026); Monaco Clean Air Act indictment (DOJ, May 1, 2026); Cleveland-Cliffs RCRA settlement (DOJ, April 28, 2026); GOTEC sentencing (DOJ, April 17, 2026); U.S. v. Minnesota (DOJ, May 4, 2026); Maryland DPSCS proposed penalty (EPA Region 3); North Carolina I/M proposal (EPA, May 11, 2026); EPA ECHO enforcement database; DOJ proposed consent decrees.
Reporting by Eduardo Bacci. The Investigative Journal seeks comment from each named entity in active enforcement matters and updates published items as responses are received. Right of reply is open; tij.news/contact.