Last month in Chamber of Commerce of the United States of America et al. v. United States Environmental Protection Agency, the D.C. Circuit Court of Appeals denied petitions for review of the United States Environmental Protection Agency’s (“EPA’s” or the “Agency’s”) May 2024 designation of two per- and polyfluoroalkyl substances (“PFAS”) chemicals—perfluorooctanoic acid (“PFOA”) and perfluorooctanesulfonic acid (“PFOS”)—as “hazardous substances” (the “Designation”) under the Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA” or the “Act”).  The petitions were filed by industry interest groups that use, transport, or discharge PFOA and PFOS (the “Petitioners”).  Read More »

Share | Email| Comments|  Topics: Administrative Procedures Act, Agency Action, CERCLA, Contamination, D.C. Circuit, EPA, Loper Bright, PFAS, Pollutants, Potentially Responsible Parties, Rulemaking, Water

On June 6, 2025, the D.C. Circuit ruled in Appalachian Voices et al. v. FERC that the Federal Energy Regulatory Commission’s (FERC) approval of an extension of the construction deadline for Mountain Valley Pipeline, LLC’s (MVP) MVP Southgate Project (the “Southgate Project”) was permissible, denying environmental groups’ petitions for review. This case potentially forecasts future judicial treatment of agency action in the aftermath of the Loper Bright v. Raimondo decision, and signals how courts may treat future challenges aimed at delaying development in light of recent curtailment of the National Environmental Policy Act (NEPA). Read More »

Share | Email| Comments|  Topics: Administrative Appeals, Agency Action, Chevron Deference, D.C. Circuit, FERC, Loper Bright, NEPA, Oil and Gas

On June 18, 2025, the Supreme Court decided EPA v Calumet Shreveport Refining, LLC et al., and its companion case Oklahoma et al. v. EPA, clarifying the tripartite framework for determining venue in Clean Air Act (“CAA” or “Act”) litigation.  Looking at the CAA's venue provision (42 U.S.C. 7607(b)(1)), the Court explained that if a challenge is to an “nationally applicable” EPA action the challenge should be directed to the U.S. Circuit Court of Appeals for the D.C. Circuit and the matter ends there.  But, if the challenge is to a “locally or regionally applicable” EPA action, then typically those challenges belong in the relevant regional Circuit Court.  However, when a “locally or regionally applicable” action falls within the “nationwide scope or effect” exception, which requires the action be (1) “based on a determination of nationwide scope or effect” and (2) accompanied by an EPA finding to the same effect, the Court instructed that the matter should be routed back to the D.C. Circuit.  Applying this understanding of CAA's venue provision, the Court reached different conclusions in Calumet and Oklahoma, finding respectively that the “nationwide scope or effect” exception applied in one instance and not in the other. Read More »

Share | Email| Comments|  Topics: Agency Action, Air, Clean Air Act, D.C. Circuit, EPA, Federal Procedure, Procedure, Refinery, Renewable Fuel Standard, State Implementation Plans, Supreme Court, United States Supreme Court, Venue

On June 20, 2025, the Supreme Court issued it opinion in Diamond Alternative Energy v. EPA, holding fuel producers had standing—and had specifically demonstrated redressability—to challenge California-specific regulations EPA approved under the Clean Air Act.  The Court’s opinion  reversing and remanding to the D.C. Circuit left the merits of the case for another day, but acknowledged that the regulations at issue may be rescinded shortly, mooting most, if not all, of the parties’ controversy. Read More »

Share | Email| Comments|  Topics: Agency Action, Air, California, Clean Air Act, Climate Change, D.C. Circuit, Emissions, EPA, Federal Procedure, Greenhouse Gas, Legislation, Oil and Gas, Standing, Supreme Court, United States Supreme Court

On May 29, 2025, the Supreme Court decided Seven County Infrastructure Coalition v. Eagle County, reversing the D.C. Circuit’s determination that the Environmental Impact Statement (“EIS”) issued by the U.S. Surface Transportation Board (the “Board”) in connection with an approximately 88-mile railroad line in northeastern Utah violated the National Environmental Policy Act (“NEPA”).  Justice Kavanaugh, writing for the Court, concluded the NEPA question presented “is not close” and the Board was “absolutely correct” in declining to evaluate “environmental effects from separate projects upstream or downstream from the project at issue” in the EIS.    Read More »

Share | Email| Comments|  Topics: Administrative Appeals, Administrative Hearing, Administrative Procedures Act, D.C. Circuit, Decisions of Note, Federal Circuit, Loper Bright, NEPA, Oil and Gas, Pipelines, Railroad, Supreme Court, United States Supreme Court

In Marin Audubon Society v. Federal Aviation Administration, No. 23-1067 (D.C. Cir. Nov. 12, 2024), the United States Court of Appeals for the District of Columbia Circuit unexpectedly held that, despite nearly fifty years of precedent, the White House’s Council on Environmental Quality (“CEQ”) lacks the authority to promulgate binding regulations for the purpose of implementing the National Environmental Policy Act (“NEPA”). Read More »

Share | Email| Comments|  Topics: Agency Action, Council on Environmental Quality, D.C. Circuit, Loper Bright, NEPA

In the wake of the Supreme Court’s decision in Loper Bright Enters. v. Raimondo, 244 S.Ct. 2244 (2024), the general breadth and scope of agency decision-making has been called into question. In its recent decision, Huntsman Petrochemical LLC v. EPA, No. 23-1045, 2024 WL 3763355 (D.C. Cir. Aug. 13, 2024), the D.C. Circuit has made it clear that where statutory interpretation is not implicated, the Court will continue to afford EPA’s conclusions involving technical expertise a significant degree of deference. While neither the parties nor the Court attempted to address or reference Loper Bright, the Court articulated a clear standard applicable to agency actions involving statistical and modeling analyses: the Court will examine each step of an agency’s analysis to satisfy themselves that the agency has not “departed from a rational course.” Only where a statistical model “bears no rational relationship to the characteristics of data to which it was applied” will agency action be deemed arbitrary and capricious. Accordingly, regulated entities should be aware that the concept of deference lives on when challenging agency decision-making, even in the wake of the fall of Chevron Deference. Read More »

Share | Email| Comments|  Topics: Air, Chevron Deference, Clean Air Act, D.C. Circuit, Emissions, EPA, HAPs, Hazardous Air Pollutants, Rulemaking

On February 22, 2021, the D.C. Circuit granted the Environmental Protection Agency’s (“EPA”) motion to stay the vacatur of the Trump administration’s Clean Power Plan Repeal Rule until EPA conducts further rulemaking on the issue in the case of American Lung Association v. EPA, No. 19-1140 (D.C. Cir., Feb. 22, 2021). This decision marks the latest action in the ongoing efforts by EPA and states to regulate greenhouse gas emissions; particularly in terms of carbon emissions from currently existing power plants. For additional background, please see previous MGKF blog on this topic here.  Read More »

Share | Email| Comments|  Topics: Air, Case Update, Clean Air Act, Climate Change, D.C. Circuit, Greenhouse Gas, Rulemaking

On January 19, 2021, the U.S. Court of Appeals for the D.C. Circuit vacated and remanded the Trump administration’s Affordable Clean Energy Rule (“ACE Rule”), which itself was a rollback of the Obama administration’s Clean Power Plan (“CPP”); once again reshaping the heart of American climate policy. American Lung Association v. EPA, No. 19-1140 (D.C. Cir., Jan. 19, 2021). The CPP and ACE Rule both sought to regulate greenhouse gas (“GHG”) emissions from existing stationary sources but used highly divergent interpretations of the Clean Air Act (“CAA”) to do so. In making its ruling, the Court called the Trump Environmental Protection Agency’s interpretation of the CAA a “fundamental misconstruction” of the statute and provided a lengthy analysis of its findings. Id. at 16. The Court ultimately held that because the Environmental Protection Agency (“EPA”) based the ACE Rule “on an erroneous view of the law” (as opposed to having based the ACE Rule on a valid exercise of agency discretion), the court had no choice but to vacate the rule and remand it to the EPA for additional interpretation. Id. at 46. Because President Biden has described climate change as the “existential threat of our time,” the Biden EPA will likely use this opportunity to draft new rulemaking regarding the regulation of GHG emissions. Read More »

Share | Email| Comments|  Topics: Air, Clean Air Act, Climate Change, D.C. Circuit, Greenhouse Gas, Rulemaking

The D.C. Circuit recently held that EPA was not required to consider mitigation measures taken at a site when determining whether to add the site to the National Priorities List (“NPL”) under CERCLA. Meritor, Inc. v. EPA, No. 18-1325, 2020 WL 4299124 (D.C. Cir. July 28, 2020).

In 2016, the U.S. Environmental Protection Agency (“EPA”) conducted a study of indoor air quality at the Rockwell International Wheel & Trim facility (the “Site”), located in Mississippi, and discovered elevated concentrations of toluene, trichloroethylene (“TCE”), and cis-1,2-dichloroethene (“DCE”) in the main building at the Site. In 2017, Meritor, Inc. (“Meritor”), which inherited liability for contamination at the Site, conducted a subsurface investigation beneath the main building and uncovered elevated levels of toluene and TCE. In that same year, Meritor installed a sub-slab depressurization system designed to mitigate the impacts of vapor intrusion in the main building. In 2018, notwithstanding Meritor’s mitigation efforts, EPA added the Site to the NPL based on vapor intrusion impacts. Read More »

Share | Email| Comments|  Topics: CERCLA, D.C. Circuit, National Priorities List, Solvents, Superfund, Vapor Intrusion