July 30, 2026
Upcoming Changes to Stationary Source Regulations
EPA’s 2026 regulatory agenda has been released. The following table summarizes EPA’s Office of Air and Radiation’s (OAR) plans for proposing and finalizing new regulations. Among other things, OAR is responsible for crafting regulations under the NSPS, NESHAP (including air toxics), and NSR programs. The table is not all-inclusive of every OAR regulatory action. Instead, it includes those actions relevant to the McCoy and Associates’ CAA Unraveled seminar.
2026 OAR Regulatory Agenda—NSPS, EGs, and federal plans
Rule description | Action | Scheduled date |
|---|---|---|
Steel plants: Reconsideration, Subparts AA and AAb2 | NPRM | 7/26 |
Synthetic organic chemical manufacturing: Reconsideration of 2024 review, Subparts IIIa, NNNa, and RRRa2 | NPRM | 7/26 |
Oil and natural gas: Reconsideration of standards, Subparts OOOOb and OOOOc2 | NPRM | 7/26 |
Volatile organic liquid tank storage: Reconsideration of 2024 rule, Subpart Kc2 | NPRM | 7/26 |
Other solid waste incineration units: Federal plan to implement emission guidelines, Part 62, Subpart KKK | NPRM | 7/26 |
Carbon pollution standards repeal: GHG emissions standards repeal for fossil fuel-fired units, Subparts TBD | Final Rule | 7/26 |
Bulk gasoline terminals: Reconsideration of 2024 rule, Subparts XX and XXa2 | NPRM | 7/26 |
Air curtain incinerators: Consolidation of standards, Subparts TBD2 | Final Rule | 7/26 |
Stationary compression ignition engines: Amendments, Subpart IIII2 | NPRM | 7/26 |
Residential wood heaters, hydronic heaters, and forced-air furnaces: Amendments, Subparts AAA and QQQQ | NPRM | 12/26 |
Municipal solid waste landfills: Reconsideration of standards, Subparts Cf and XXX1 | NPRM | TBD |
2026 OAR Regulatory Agenda—NESHAP and Air Toxics
Rule description | Action | Scheduled date |
|---|---|---|
Lime manufacturing: Reconsideration of petition, Subpart AAAAA2 | NPRM | 7/26 |
Taconite iron ore processing: Reconsideration of 2024 rule, Subpart RRRRR2 | NPRM | 7/26 |
Boilers and process heaters: Amendments to new source dates, Subpart DDDDD2 | NPRM | 7/26 |
Primary copper smelting: Review and area source reconsideration: Subparts QQQ and EEEEEE2 | NPRM | 7/26 |
Synthetic organic chemical manufacturing: Reconsideration of 2024 review, Subparts F, G, H, I, and U2 | NPRM | 7/26 |
Integrated iron and steel manufacturing: Reconsideration of 2024 review, Subpart FFFFF2 | NPRM | 7/26 |
Coke ovens and coke oven batteries: Reconsideration of 2024 review, Subparts L and CCCCC2 | NPRM | 7/26 |
Gasoline distribution: Reconsideration of 2024 rule, Subparts R and BBBBBB2 | NPRM | 7/26 |
Plywood and composite wood products: Review amendments, Subpart DDDD | Final Rule | 7/26 |
Hazardous waste combustors: Review, Subpart EEE | Final Rule | 7/26 |
Commercial ethylene oxide sterilization facilities, Reconsideration of 2024 review, Subpart O2 | Final Rule | 8/26 |
Secondary lead smelting, Reconsideration of petition, Subpart X | Final Rule | 10/26 |
Portland cement manufacturing: Reconsideration of 2018 final rule, Subpart LLL | NPRM | 11/26 |
Stationary combustion turbines: Reconsideration of the 2020 residual risk and technology review, Subpart YYYY | NPRM | 12/26 |
Petition to delist HAP: remove 2-butoxyethyl benzoate from category of glycol ethers2 | Final Rule | 12/26 |
Marine tank vessel loading operations: Review, Subpart Y | Final Rule | 1/27 |
Oil and natural gas sector: Review, Subparts HH and HHH | Final Rule | 4/27 |
Chromium electroplating: Review, Subpart N1 | NPRM | 7/27 |
Glass manufacturing: New standard for major sources1 | NPRM | 11/27 |
Hospital ethylene oxide sterilizers: Review, Subpart WWWWW1 | NPRM | 3/28 |
Halogenated solvent cleaning: Review, Subpart T1 | NPRM | 2/29 |
Polyvinyl chloride and copolymers production: Reconsideration of emission limits, Subparts DDDDDD and HHHHHHH1 | Final Rule | 9/30 |
Regulatory requirements for new HAP additions to Part 631 | Final Rule | TBD |
2026 OAR Regulatory Agenda—NSR and Other Rules
Rule description | Action | Schedule date |
|---|---|---|
Revise NSR definition of “begin actual construction”2 | NPRM | 7/26 |
Review of NAAQS for Pb1 | NPRM | 10/27 |
Review of primary NAAQS for NOX1 | NPRM | 1/28 |
Revisit 2024 Reconsideration of NAAQS PM1,2 | NPRM | TBD |
Review of NAAQS for O31 | NPRM | TBD |
ANPRM = advanced notice of proposed rulemaking; EG = emission guidelines; NPRM = notice of proposed rulemaking; TBD = to be determined
1Long-term actions: Items under development but for which the agency does not expect to have a regulatory action within 12 months after publication in the regulatory agenda.
2Considered a deregulatory action per Executive Order 14192.
Source: EPA’s 2026 regulatory agenda; EPA’s 2026 long-term actions
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Considerable care has been exercised in preparing this document; however, McCoy and Associates, Inc. makes no representation, warranty, or guarantee in connection with the publication of this information. McCoy and Associates, Inc. expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal law or regulation with which this information may conflict. McCoy and Associates, Inc. does not undertake any duty to ensure the continued accuracy of this information.
This document addresses issues of a general nature related to the federal environmental regulations. Persons evaluating specific circumstances dealing with the environmental regulations should review state and local laws and regulations, which may be more stringent than federal requirements. In addition, the assistance of a qualified professional should be enlisted to address any site-specific circumstances.
