October 20, 2025
Upcoming Changes to Stationary Source Regulations
EPA’s Spring 2025 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.
Spring 2025 OAR Regulatory Agenda—NSPS
Rule description | Action | Scheduled date |
|---|---|---|
Oil and natural gas: Deadline extension, Subparts OOOOb and OOOOc | Final Rule | 7/25 |
Municipal waste combustors and commercial and industrial solid waste incinerators: Provision consolidation, Subparts Cb, Ea, Eb, AAAA, BBBB, CCCC, and DDDD | Final Rule | 7/25 |
Oil and natural gas: Partial reconsideration of standards, Subparts OOOOb and OOOOc | Final Rule | 9/25 |
Large municipal waste combustors: Title V permitting exemption, Subparts Cb, Ea, and Eb | Final Rule | 9/25 |
Synthetic organic chemical manufacturing review: Reconsideration of 2024 review, Subparts IIIa, NNNa, RRRa, and VVb | NPRM | 10/25 |
Oil and natural gas: Reconsideration of standards, Subparts OOOOb and OOOOc | NPRM | 11/25 |
Stationary combustion turbines: Review, Subpart KKKK | Final Rule | 11/25 |
Large municipal waste combustors: Review, Subparts Eb and Cb | Final Rule | 12/25 |
GHG emissions standards repeal for fossile fuel-fired EGUs | Final Rule | 12/25 |
Bulk gasoline terminals: Review, Subparts XX and XXa | NPRM | 4/26 |
Residential wood heaters, hydronic heaters, and forced-air furnaces: Amendments, Subparts AAA and QQQQ1 | NPRM | 1/27 |
Municipal solid waste landfills: Reconsideration of standards, Subparts Cf and XXX1 | NPRM | TBD |
Pulp and paper: Review, Subpart BBa1 | NPRM | TBD |
Spring 2025 OAR Regulatory Agenda—NESHAP and Air Toxics
Rule description | Action | Scheduled date |
|---|---|---|
Hazardous waste combustors: Review, Subpart EEE | NPRM | 7/25 |
Petition to delist HAP: remove 2-butoxyethyl benzoate from category of glycol ethers | NPRM | 9/25 |
Lime manufacturing: Review, Subpart AAAAA | NPRM | 9/25 |
Taconite iron ore processing: Reconsideration of 2024 rule, Subpart RRRRR | NPRM | 9/25 |
Commercial ethylene oxide sterilization facilities, Reconsideration of 2024 review, Subpart O | NPRM | 9/25 |
Primary copper smelting: Review and area source reconsideration: Subparts QQQ and EEEEEE | NPRM | 10/25 |
Secondary lead smelting, Reconsideration of petition, Subpart X | NPRM | 10/25 |
Synthetic organic chemical manufacturing: Reconsideration of 2024 review, Subparts F, G, H, I, U, and W | NPRM | 10/25 |
2024 MM2A rule revocation due to 2025 CRA revocation | Final Rule | 10/25 |
Integrated iron and steel manufacturing: Reconsideration of 2024 review, Subpart FFFFF | NPRM | 11/25 |
Coke ovens and coke oven batteries: Reconsideration of 2024 review, Subparts L and CCCCC | NPRM | 12/25 |
Oil and natural gas sector: Review, Subparts HH and HHH | NPRM | 12/25 |
Coal- and Oil-fired EGUs: Repeal 2024 rule, Subpart UUUUU | Final Rule | 12/25 |
Marine tank vessel loading operations: Review, Subpart Y | NPRM | 1/26 |
Chemical manufacturing area source: Review, Subpart VVVVVV | Final Rule | 1/26 |
Polyether polyols production: Review, Subpart PPP | Final Rule | 1/26 |
Rubber tire manufacturing 2024 processing subcategory revocation due to 2025 CRA revocation | Final Rule | 1/26 |
Gasoline distribution: Review, Subparts R and BBBBBB | NPRM | 4/26 |
Regulatory requirements for new HAP additions to Part 631 | Final Rule | 7/26 |
Plywood and composite wood products: Review amendments, Subpart DDDD | Final Rule | 7/26 |
Portland cement manufacturing: Review of idle kiln provision, Subpart LLL1 | NPRM | 11/26 |
Chromium electroplating: Review, Subpart N1 | NPRM | 4/27 |
Glass manufacturing: New standard for major sources1 | NPRM | 11/27 |
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 |
Hospital ethylene oxide sterilizers: Review, Subpart WWWWW1 | NPRM | TBD |
Primary magnesium refining: Review, Subpart TTTTT1 | NPRM | TBD |
Stationary combustion turbines: Reconsideration of the 2020 residual risk and technology review, Subpart YYYY1 | NPRM | TBD |
Pulp and paper: Review, Subparts S and MM1 | NPRM | TBD |
Spring 2025 OAR Regulatory Agenda—NSR and Other Rules
Rule description | Action | Schedule date |
|---|---|---|
Revisit 2024 Reconsideration of NAAQS PM | NPRM | 07/25 |
Revise NSR definition of “begin actual construction” | NPRM | 1/26 |
Review of primary NAAQS for NOX1 | NPRM | TBD |
Review of NAAQS for O31 | NPRM | TBD |
ANPRM = advanced notice of proposed rulemaking; 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.
Source: EPA’s Spring 2025 regulatory agenda; EPA’s Spring 2025 long-term actions
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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.
