EPA Proposes Axing CO Contingencies for Chico, Modesto, Stockton Air Plans
Published Date: 3/31/2025
Proposed Rule
Summary
The EPA wants to approve changes to California’s air plan that remove extra carbon monoxide rules and monitoring in Chico, Modesto, and Stockton. This means these cities won’t have to follow some backup pollution controls anymore. The EPA is asking for public comments before making it official, so folks have a chance to weigh in soon.
Analyzed Economic Effects
1 provisions identified: 0 benefits, 1 costs, 0 mixed.
CO Rules Removed in Three Cities
If you live, work, or run a business in Chico, Modesto, or Stockton, the EPA is proposing to approve a change that removes carbon monoxide (CO) contingency measures and monitoring requirements from those areas' maintenance plans. If finalized, local authorities in those three urbanized areas would no longer be required to keep certain backup CO pollution controls or monitoring under the Clean Air Act.
Your PRIA Score
Personalized for You
How does this regulation affect your finances?
Sign up for a PRIA Policy Scan to see your personalized alignment score for this federal register document and every other regulation we track. We analyze your financial profile against policy provisions to show you exactly what matters to your wallet.
Key Dates
Department and Agencies
Related Federal Register Documents
2026-10641 — Hazardous and Solid Waste Management System: Disposal of Coal Combustion Residuals From Electric Utilities; Federal CCR Permit Program; Reopening of Comment Period
The EPA is reopening the comment period until June 29, 2026, for its proposed rule to create a federal permit program for safely disposing of coal ash from power plants. This affects electric utilities that handle coal waste and aims to improve environmental safety while possibly impacting their costs. Now’s the time for everyone to share their thoughts and help shape the rules!
2026-10387 — Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements Promulgated Under the Technology Transitions Provisions of the American Innovation and Manufacturing Act of 2020
The EPA is updating rules to phase down hydrofluorocarbons (HFCs), chemicals used in cooling systems like refrigerators and air conditioners. These changes affect businesses in refrigeration, supermarkets, semiconductor manufacturing, and more, allowing some older equipment made before 2025 to keep running. The new rules kick in on July 27, 2026, helping industries transition smoothly while cutting harmful emissions.
2026-10086 — Extending the Compliance Deadline for the PFOA and PFOS Maximum Contaminant Levels
The EPA is giving water systems more time to meet safety rules for two harmful chemicals, PFOA and PFOS, by extending the deadline from April 2029 to April 2031 if they ask for it. This helps water providers get ready without rushing, keeping our drinking water safe. The EPA wants your thoughts and will hold a public hearing in July 2026 to hear from everyone.
2026-10085 — Rescission of Regulatory Determinations and Removal of Related Provisions for Four PFAS Substances (PFHxS, PFNA, HFPO-DA (GenX), and the Mixture of These Three PFAS Plus PFBS)
The EPA is proposing to undo its rules for four PFAS chemicals (PFHxS, PFNA, GenX, and a mix including PFBS) in drinking water because the original process wasn’t done right. This means public water systems won’t have to monitor or treat these chemicals for now. People and water providers should weigh in by July 20, 2026, and a virtual hearing happens July 7.
2026-09895 — Effluent Limitations Guidelines and Standards for the Steam Electric Power Generating Point Source Category-Unmanaged Combustion Residual Leachate
The EPA is updating rules for steam electric power plants to better control dirty water leaking from leftover coal waste. This change affects existing power plants and is expected to save up to $1 billion a year while protecting water quality. Comments on the proposal are open until June 17, 2026, so now’s the time to speak up!
2026-09524 — Begin Actual Construction in the New Source Review (NSR) Preconstruction Permitting Program
The EPA is updating rules about when companies can start building big projects that might affect air quality. Now, they can begin building parts that don’t release pollution before getting a full air permit, making things clearer and easier. This change mainly affects businesses planning major construction and could speed up projects without extra costs, but comments are due by June 29, 2026.
Previous / Next Documents
Previous: 2025-05287 — Amendment of VOR Federal Airway V-233 and Revocation of VOR Federal Airway V-320 Due to the Decommissioning of the Mount Pleasant, MI, VOR
The FAA is canceling its plan to change two air routes near Mount Pleasant, Michigan, because they decided not to turn off the Mount Pleasant navigation beacon just yet. Pilots flying these routes won’t see any changes for now, and there’s no cost impact. This means the current flight paths stay the same until further notice.
Next: 2025-05385 — Section 610 Review of National Emission Standards for Hazardous Air Pollutants for Brick and Structural Clay Products Manufacturing and Clay Ceramics Manufacturing
The EPA is checking if the rules that limit pollution from brick, clay, and ceramics factories still make sense and work well. They want to hear from people about any problems or changes needed. This review could lead to updates that affect factories, possibly changing costs or how they operate soon.