EPA launches 31-rule deregulatory sweep

Summary

EPA Administrator Lee Zeldin announced 31 deregulatory actions targeting air quality, climate, water, and vehicle standards - described by the agency as "the greatest and most consequential day of deregulation in U.S. history."

What happened

The 31 actions included formal reconsideration of the 2009 GHG Endangerment Finding, the Biden-era Clean Power Plan 2.0 (power-plant GHG limits), vehicle tailpipe emissions standards for model years 2027+, the 2024 Mercury and Air Toxics Standards (MATS) amendments, the PM2.5 soot standard, methane rules for oil and gas, and water-quality protections. The announcement did not finalize any rule but initiated formal reconsideration proceedings, each requiring its own notice-and-comment rulemaking.

Impact on the United States

The announcement placed rules covering power-plant, vehicle and oil-and-gas emissions, mercury and air toxics, fine-particle (PM2.5) air-quality standards and industrial wastewater under reconsideration at once. EPA said the actions would "roll back trillions in regulatory costs"; environmental groups said many of the targeted rules had played a central role in tackling air and water pollution.

Documented effects

1. Mar 2025EPA announced all 31 actions on a single day, March 12, 2025, calling it "the greatest and most consequential day of deregulation in U.S. history." The announcement was a statement of intent to reconsider the rules; legal challenges attached to the individual rules as they were later finalized, not to the March 12 announcement itself.[1][2]
2. The announcement included reconsideration of the 2009 Endangerment Finding, the legal basis for federal GHG regulation; EPA finalized its repeal on February 12, 2026.[1][3]

Why this is rated significant

What EPA called the largest single-day deregulatory action placed air, water, and climate rules under review; significant, but most rulemakings remain at various incomplete stages.

individual rulemakings at various stages

Corrections & updates [4]

Every change to a fact on this page after publication is logged here, newest first.

1. Sep 29, 2026CorrectedSource

   The EPA link cited for this March 12, 2025 announcement now opens a different release, dated February 12, 2026, about the final repeal of the 2009 Endangerment Finding. It is replaced with the original March 12, 2025 release, "EPA Launches Biggest Deregulatory Action in U.S. History." The 2026 release is kept as a separate source.[1][3]

2. Sep 29, 2026CorrectedQuote

   The quoted phrase "the single largest deregulatory action in US history" and the words "alongside President Trump" come from EPA's February 2026 release on the Endangerment Finding repeal. In the March 12, 2025 release, Administrator Zeldin announces "31 historic actions in the greatest and most consequential day of deregulation in U.S. history."[1]

   + Show previous and current text- Hide previous and current text

   Previously

   EPA Administrator Lee Zeldin, alongside President Trump, announced 31 distinct regulatory rollback actions targeting air quality, climate, water, and vehicle standards - described by the agency as "the single largest deregulatory action in US history."

   Now

   EPA Administrator Lee Zeldin announced 31 deregulatory actions targeting air quality, climate, water, and vehicle standards - described by the agency as "the greatest and most consequential day of deregulation in U.S. history."

3. Sep 29, 2026CorrectedKey facts

   A key fact said the package was "immediately challenged by 20+ state attorneys general." No cited source supports this, and the entry's own effects say legal challenges came later, against individual final rules. It is replaced with a sourced development: EPA finalized the Endangerment Finding repeal on February 12, 2026. Two claims are removed because no source supports them: that the administration "compressed" notice-and-comment, and the "$300B+ clean-energy industry" figure.[1][3]

4. Sep 29, 2026CorrectedUS impact

   The entry said the package put protections for about 156 million Americans under review, created uncertainty that prevented compliance planning, and exceeded any prior single-day EPA action; its effects said the scope 'strained the notice-and-comment process.' No cited source says any of this. The 'largest' description is EPA's own claim and is now attributed. The US-impact text now lists the rules EPA named and the reactions Al Jazeera reported.[1][2]

Sources [3]