Insights

In a significant and unanimous ruling, the D.C. Circuit upheld the Environmental Protection Agency’s (“EPA”) final rule designating perfluorooctanoic acid (“PFOA”) and perfluorooctanesulfonic acid (“PFOS”) as “hazardous substances” under the Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”), denying the petitions of seven industry groups seeking to overturn that designation.[1] CERCLA, also known as the “Superfund Statute,” allows EPA to require potentially responsible parties to fund cleanup of hazardous substances.

The nation’s power grid and infrastructure are facing increased pressure from artificial intelligence (AI) data centers, prompting new questions around environmental regulatory design and compliance. As technology companies race to build and expand new data center factories, they face a web of permitting requirements as well as potential community opposition, and environmental litigation — all against a backdrop of rapid and still-evolving agency guidance.

Earlier this month, the U.S. Environmental Protection Agency (EPA) withdrew a February 2024 Biden administration proposed rule, “Definition of Hazardous Waste Applicable to Corrective Action for Releases From Solid Waste Management Units,” under the Resource Conservation and Recovery Act (RCRA).[1] The withdrawn proposal would have revised RCRA corrective action regulations to expressly apply the broader statutory definition of “hazardous waste,” rather than only the narrower regulatory definition. Now, EPA is maintaining the status quo for corrective action under RCRA. However, EPA’s withdrawal of its proposed RCRA hazardous waste definition makes no mention of its corresponding proposal from 2024 to list nine per- and polyfluoroalkyl substances (PFAS) as RCRA hazardous constituents.[2] This disjointed withdrawal, while providing some certainty for regulated entities, does not resolve how EPA plans to address PFAS under the RCRA program.