On March 12, 2025, EPA Administrator Lee Zeldin announced the agency’s intention to reconsider 31 environmental regulations, describing the effort as the “single most impactful day of deregulation in EPA history.” While the scope of this initiative spans air, water, and climate regulations, the most consequential actions—legally and practically—center on a handful of cross-cutting programs and sector-specific rules.
Although the EPA’s announcement is styled as a deregulatory roadmap, none of the targeted rules are rescinded yet. Each proposed rollback will require full notice-and-comment rulemaking under the Administrative Procedure Act (APA), and legal challenges are inevitable. This GT Alert summarizes seven of the most significant rulemakings to watch and highlights the legal and procedural headwinds the EPA is likely to face.