Regulatory Tracker Once In Always In Guidance for Major Sources under the Clean Air Act Congress repealed the 2024 rule using the Congressional Review Act and EPA reinstated the 2020 rule, which allows a major source to reclassify as an area source if the source reduces HAP emissions. February 11, 2026
Regulatory Tracker The Social Cost of Greenhouse Gases (Carbon Dioxide, Methane, Nitrous Oxide) President Trump disbanded the interagency working group on the social cost of greenhouse gases, withdrew the working group’s guidance documents, and ordered agencies to use emissions estimates from the 2003 version of OMB’s Circular A-4. He also directed EPA to review how and whether the social cost of carbon should be used. January 30, 2026
Federal Environmental Justice Tracker EPA Proposed Rule Limiting Authority of States to Block Infrastructure Projects January 15, 2026
Regulatory Tracker Section 401 Water Quality Certification CWA section 401 governs certification of water quality and provides significant latitude to states to decide how to issue certifications. The Trump EPA proposed a rule to update Section 401 which would limit states’ ability to regulate activities subject to 401 certification. January 15, 2026
Federal Environmental Justice Tracker EPA Ceased Monetization of Public Health Benefits in Air Regulations January 12, 2026
Federal Environmental Justice Tracker EPA Proposed Rule Regulating Perchlorate in Drinking Water January 6, 2026
Regulatory Tracker Power Plant Startup, Shutdown, and Malfunction Rule In early January 2025, the Biden EPA withdrew its direct final rule and indicated it would release a subsequent rule addressing the 13 states that failed to submit state implementation plan revisions. January 2, 2026
Federal Environmental Justice Tracker EPA Finalized Rule Extending Power Plant Effluent Limit Deadlines December 31, 2025
