The U.S. Environmental Protection Agency (EPA or the Agency) has received a complete Underground Injection Control (UIC) application from the State of Alaska, requesting primary enforcement responsibility (primacy) for Class VI injection wells under Safe Drinking Water Act (SDWA) section 1422. The EPA's approval of the State's UIC program primacy application would allow the Alaska Oil and Gas Conservation Commission (AOGCC) to issue and enforce compliance with UIC Class VI permits for injection wells used for geologic carbon sequestration. In this action, the EPA proposes to approve Alaska's application to implement the UIC program for Class VI injection wells located within the State, except those located within Indian country and those located within areas of exclusive Federal jurisdiction.
Comments close Dec 14, 2026
The U.S. Environmental Protection Agency (EPA) is proposing amendments to the New Source Performance Standards and Emission Guidelines for the Crude Oil and Natural Gas Source Category to address additional concerns raised with prior regulatory amendments finalized in March 2024. Specifically, the EPA is proposing changes in response to certain petitions for reconsideration of the March 2024 amendments, changes based on policy decisions and supporting legal interpretations, and changes that correct and clarify the regulatory text of the new source performance standards and emission guidelines. First, the EPA proposes to rescind the Super Emitter Program. Second, the EPA proposes to subcategorize different types of well sites affected and designated facilities to address issues related to the requirements finalized in March 2024 for marginal well sites and conventional well sites. Third, the EPA proposes changes to address issues related to liquids unloading, process controllers, pumps, fugitive emissions, storage vessels, covers and closed vent systems, equipment leaks at gas plants, and associated gas. Fourth, the EPA proposes changes to certain requirements finalized in March 2024 related to control devices and to provide owners and operators the option to conduct optical gas imaging surveys according to Appendix K for gas processing facilities. Lastly, the EPA proposes changes to correct inadvertent errors and to clarify regulatory language.
Comments close Nov 30, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing to approve the State of Tennessee's attainment plan for the Sullivan County Nonattainment Area (Sullivan County Area or Area) for the 2010 Sulfur Dioxide (SO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). Additionally, the EPA is proposing to determine that the Area has attained the 2010 SO<INF>2</INF> NAAQS and to approve Tennessee's maintenance plan for continued attainment. With these approvals, the EPA is proposing to approve Tennessee's comprehensive source-specific SO<INF>2</INF> permitted limits for two facilities in the Area, other control measures, and provisions for Reasonably Available Control Measures (RACM) and Reasonably Available Control Technology (RACT), reasonable further progress (RFP), a modeling demonstration of SO<INF>2</INF> attainment and maintenance, and to approve Tennessee's request to redesignate the Area from nonattainment to attainment of the 2010 SO<INF>2</INF> NAAQS. The EPA is taking these actions in accordance with the Clean Air Act (CAA or Act).
Comments close Nov 30, 2026
The U.S. Environmental Protection Agency (EPA or "the Agency") is proposing to approve a state implementation plan (SIP) revision from the State of California to meet the Clean Air Act (CAA) "Extreme" nonattainment area requirements for the Riverside County (Coachella Valley), California ozone nonattainment area ("Coachella Valley") for the 2008 8-hour ozone national ambient air quality standards (NAAQS or "standards"). Specifically, the Agency is proposing to approve the reasonable further progress (RFP) demonstration and associated emissions inventory and motor vehicle emissions budgets ("budgets") for the Coachella Valley.
Comments close Nov 30, 2026
The U.S. Environmental Protection Agency (EPA or Agency) has received a complete Underground Injection Control (UIC) program revision application from the State of Utah, requesting primary enforcement responsibility (primacy) for Class VI injection wells under Safe Drinking Water Act (SDWA) section 1422. The EPA's approval of the State's UIC program revision application would allow the Utah Department of Natural Resources, Division of Oil, Gas and Mining (DOGM) to issue and enforce compliance with UIC Class VI permits for injection wells used for geologic carbon sequestration. In this action, the EPA proposes to approve Utah's application to implement the UIC program for Class VI injection wells located within the State, except those on Indian lands for which the EPA retains primacy. The EPA has determined that Utah's UIC Class VI program meets Federal requirements for primacy under SDWA section 1422 and the applicable implementing regulations in 40 CFR parts 144, 145, and 146.
Comments close Dec 7, 2026
On September 30, 2021, the State of Nevada (Nevada) received final approval, from the Environmental Protection Agency (EPA), of revisions to its Underground Storage Tank Program (UST Program) under subtitle I of the Resource Conservation and Recovery Act (RCRA). Pursuant to RCRA, the EPA is taking direct final action to codify the approval of Nevada's revised UST Program and incorporate by reference those provisions of Nevada's statutes and regulations that the EPA has determined meet the requirements for approval.
Comments close Nov 23, 2026
The Northwest Clean Air Agency (NWCAA), located in Washington State, submitted updated regulations for receiving delegation and approval of its program for the implementation and enforcement of newly issued or revised New Source Performance Standards (NSPS) and National Emission Standards for Hazardous Air Pollutants (NESHAP), as provided for under previously approved delegation mechanisms. The updated regulations incorporate by reference certain NSPS and NESHAP promulgated by the Environmental Protection Agency (EPA) as they existed through October 18, 2023. The EPA is providing notice that it is proposing to update the delegation of certain NSPS and approve the delegation of certain NESHAP to NWCAA. The proposed delegation of authority under this action does not apply to sources located in Indian country.
Comments close Nov 18, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve a revision to the Arizona Department of Environmental Quality (ADEQ or "State") portion of the Arizona State Implementation Plan (SIP). This revision concerns emissions of particulate matter (PM) that are 10 micrometers ([mu]m) or smaller in diameter (PM<INF>10</INF>) from agricultural crop and animal operations in the West Pinal County PM<INF>10</INF> nonattainment area. We are proposing to approve two local rules to regulate these emission sources under the Clean Air Act (CAA or "Act").
Comments close Nov 18, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision submitted by the State of Arizona to meet Clean Air Act (CAA or "Act") requirements applicable to the Pinal County (Part); West Pinal PM<INF>10</INF> nonattainment area ("West Pinal County PM<INF>10</INF> Nonattainment Area"). The EPA is proposing to find that the submitted SIP revision meets all applicable "Moderate" area, "Serious" area, and CAA section 189(d) requirements for the PM<INF>10</INF> national ambient air quality standards (NAAQS). Additionally, the EPA is proposing to approve the PM<INF>10</INF> motor vehicle emissions budgets included with the SIP revision for transportation conformity purposes. The EPA is also starting the adequacy process for these budgets. Our proposed approval of the SIP revision would establish an attainment date of December 31, 2026, for the area.
Comments close Nov 18, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve revisions to the Pinal County Air Quality Control District (PCAQCD or "District") portion of the Arizona State Implementation Plan (SIP). These revisions concern emissions of particulate matter (PM) that is 10 micrometers or smaller in diameter (PM<INF>10</INF>) from fugitive dust sources, including open areas/vacant lots, unpaved lots, unpaved roads, paved public roadways, and construction sites. We are proposing to approve local rules to regulate these emission sources under the Clean Air Act (CAA or "Act").
Comments close Nov 18, 2026
The U.S. Environmental Protection Agency (EPA) is co-proposing two approaches to revising the existing 2026 and 2027 small refinery exemption (SRE) reallocation volumes under the Renewable Fuel Standard (RFS) program in response to a higher volume of 2025 SREs than previously projected when the Agency set the renewable fuel volumes and percentage standards on April 1, 2026. One approach would reallocate the additional 2025 SRE volume equally between the 2026 and 2027 SRE reallocation volumes, while the other approach would reallocate all the additional 2025 SRE volume to the 2027 SRE reallocation volume. Additionally, given the proposed revision to the 2026 standards, this proposed action may extend the existing 2026 compliance reporting deadline of March 31, 2027.
Comments close Dec 4, 2026
The Environmental Protection Agency (EPA) is taking interim final action to extend the reporting deadline under the Greenhouse Gas Reporting Rule for reporting year 2025 data from October 30, 2026, to March 10, 2027. This final action only changes the reporting deadline for annual greenhouse gas reports for reporting year 2025 and makes no other changes to the rule. The EPA is requesting comments on all aspects of this interim final rule.
Comments close Nov 30, 2026
The Environmental Protection Agency (EPA or Agency) is proposing to extend certain compliance dates applicable to certain entities subject to the regulation of trichloroethylene (TCE) under the Toxic Substances Control Act (TSCA) until December 31, 2027, including for certain chemical processors in meeting the prohibition compliance deadline for the processing of TCE, industrial and commercial use of TCE as a processing aid, and associated wastewater disposal; and for refrigerant manufacturers in meeting the compliance deadline for phasing down TCE feedstock in the production of HFC-134a. This proposed compliance extension would allow for necessary and reasonable transition periods for regulated entities under TSCA section 6(d).
Comments close Nov 13, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve a revision to the Maricopa County Air Quality Department (MCAQD or "Department") portion of the Arizona State Implementation Plan (SIP). This revision establishes a federally enforceable program allowing nonroad engine fleet owners/operators to generate emission reduction credits (ERCs) by either retrofitting their nonroad engines or replacing their nonroad engines with lower-emitting nonroad engines while meeting other Clean Air Act (CAA or "Act") requirements. These ERCs are intended for use as offsets for major stationary sources under the Department's Nonattainment New Source Review (NNSR) program. We are proposing to approve a local rule to allow for the generation of ERCs through voluntary nonroad engine emission reductions under the CAA.
Comments close Nov 9, 2026
The Environmental Protection Agency (EPA) is proposing to approve the negative declarations submitted by the West Virginia Department of Environmental Protection (WVDEP) on July 13, 2026. The negative declarations submitted by WVDEP certify that there are no existing large municipal waste combustors (LMWC) or other solid waste incinerators (OSWI) subject to sections 111(d) and 129 of the Clean Air Act (CAA) within the jurisdiction of West Virginia.
Comments close Nov 6, 2026
The U.S. Environmental Protection Agency (EPA) is providing notice of the Agency's intended approach for area designations for the 2024 primary annual fine particulate matter (PM<INF>2.5</INF>) National Ambient Air Quality Standard (NAAQS) (the 2024 annual PM<INF>2.5</INF> NAAQS) under Clean Air Act (CAA) section 107(d). Details regarding these designations, as well as the EPA's notifications to States, territories, and Tribes regarding their initial area designations are accessible via the Agency's website and public electronic docket. With this notice, the EPA is providing an opportunity for public comment on its intended approach for finalizing area designations during the comment period specified in the DATES section. The EPA sent notifications directly to applicable States, territories, and Tribes regarding their initial area designations on or about October 2, 2026, and anticipates promulgating final designations consistent with CAA requirements.
Comments close Nov 5, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve the "Second 10-Year Maintenance Plan for the Truckee Meadows 24-Hour PM<INF>10</INF> Attainment Area" ("Truckee Meadows Second PM<INF>10</INF> Maintenance Plan" or "Plan") as a revision to the Washoe County portion of the State implementation plan (SIP) for the State of Nevada. The Truckee Meadows Second PM<INF>10</INF> Maintenance Plan includes, among other elements, a base year emissions inventory, a maintenance demonstration, contingency provisions, and motor vehicle emissions budgets for use in transportation conformity determinations. With this proposed rulemaking, the EPA is initiating the adequacy process for the 2025, 2030, and 2040 motor vehicle emissions budgets. The EPA is proposing these actions because the SIP revision meets the applicable statutory and regulatory requirements for such plans and motor vehicle emissions budgets. We are taking comments on this proposal and plan to follow with a final action.
Comments close Nov 2, 2026
The Environmental Protection Agency (EPA) is proposing to approve into the Oregon State Implementation Plan revisions to the rules applicable in Lane County Oregon. The revisions establish procedures related to excess emissions, clarify terminology and enforceability, and update Local regulations to more closely align with State rules. The EPA is proposing to approve these revisions as meeting the requirements of the Clean Air Act.
Comments close Nov 2, 2026
On May 8, 2024, the U.S. Environmental Protection Agency (EPA) published the National Emission Standards for Hazardous Air Pollutants (NESHAP): Gasoline Distribution Technology Reviews and New Source Performance Standards (NSPS) Review for Bulk Gasoline Terminals final rule ("2024 Final Rule"). The EPA is reconsidering various provisions of the 2024 Final Rule in this proposed rule, including the operating limits and continuous compliance requirements for air emission control devices, and the vapor tightness requirements for gasoline cargo tanks. The EPA is also reconsidering the modification criteria in the NSPS and proposing other technical corrections and clarifications. The EPA does not anticipate that this proposed action will impact volatile organic compound (VOC) or hazardous air pollutant (HAP) emissions generated by gasoline distribution facilities because the proposed amendments do not impact the stringency of the emission standards set by the 2024 Final Rule. As such, the EPA expects the proposed amendments will have no impact on air quality or overall human health. The EPA is not reopening any other aspect of the 2024 Final Rule and does not intend to respond to comments addressing any other issues or provisions not specifically addressed in this proposed rulemaking.
Comments close Nov 12, 2026
In this action, the U.S. Environmental Protection Agency (EPA) is supplementing its proposal to repeal all greenhouse gas (GHG) emission standards for fossil fuel-fired electric generating units (EGUs) to effectuate the best reading of Clean Air Act (CAA) section 111. We propose that CAA section 111 does not authorize the EPA to regulate emissions from power plants in response to global climate change concerns. For the multiple and independent reasons described herein, this additional rationale would also require rescinding the Administrator's contrary findings and determinations in 2015 and repealing all associated 2015 and 2024 GHG standards for the fossil fuel-fired EGU source category. In a separate action published concurrently with this supplemental notice, the EPA is finalizing the repeal of certain 2024 GHG standards for the fossil fuel-fired EGU source category on distinct legal and technical grounds. We are not reopening that final rule. Nor are we soliciting further comment on those issues through this supplemental notice, except to the extent that commenters believe the final rule bears on the distinct questions of statutory authority addressed herein.
Comments close Nov 2, 2026
The Environmental Protection Agency (EPA or the Agency) is proposing to approve Indiana's Coal Combustion Residuals (CCR) partial permit program under the Resource Conservation and Recovery Act (RCRA). After reviewing the CCR permit program application submitted by the Indiana Department of Environmental Management (IDEM), EPA has preliminarily determined that Indiana's CCR permit program meets the standard for partial approval under RCRA. If approved, Indiana's CCR permit program will operate in lieu of the Federal CCR program, with the exception of the specific provisions noted below. EPA is seeking comment on this proposal during a 60-day public comment period and will hold a hybrid in-person and online public hearing on EPA's preliminary approval of Indiana's partial CCR permit program.
Comments close Nov 16, 2026
The Environmental Protection Agency (EPA or the Agency) is proposing to approve the Wisconsin Coal Combustion Residuals (CCR) partial permit program under the Resource Conservation and Recovery Act (RCRA). After reviewing the CCR permit program application submitted by the Wisconsin Department of Natural Resources (WDNR), EPA has preliminarily determined that Wisconsin's CCR permit program meets the standard for partial approval under RCRA. If approved, Wisconsin's CCR permit program will operate in lieu of the Federal CCR program, with the exception of the specific provisions noted below. EPA is seeking comment on this proposal during a 60-day public comment period and will hold an online public hearing on EPA's preliminary approval of Wisconsin's partial CCR permit program.
Comments close Nov 10, 2026
On September 9, 2026 the U.S. Environmental Protection Agency (EPA or Agency) proposed to repeal a final rule published in the Federal Register (FR) on December 2, 2024, partially approving and partially disapproving North Dakota's 2022 regional haze State Implementation Plan (SIP) submission for the second implementation period. The EPA proposed in the same action to approve the portions of North Dakota's 2022 SIP submission for the second implementation period that were disapproved in the EPA's 2024 partial approval/partial disapproval. The ADDRESSES section of the proposed rulemaking contained an incorrect Docket Identification Number (Docket ID No.) in the Federal Register. This document corrects an inadvertent typographical error in the Federal Register. This correction does not result in any substantive changes to the proposed rule.
Comments close Oct 9, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is approving a State Implementation Plan (SIP) revision submitted by the Commonwealth of Kentucky, through the Kentucky Division for Air Quality (DAQ), on February 20, 2025. The SIP revision includes the second 10- year maintenance plan for the Kentucky portion of the Campbell- Clermont, Kentucky-Ohio maintenance area ("Campbell-Clermont, KY-OH Area" or "Area") for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). The Kentucky portion of the Area is comprised of a part of Campbell County. The EPA is approving Kentucky's second 10-year maintenance plan for the Kentucky portion of the Area because the Commonwealth has demonstrated that it is consistent with the Clean Air Act (CAA or Act).
Comments close Oct 26, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the Commonwealth of Kentucky on February 20, 2025, for the purpose of establishing a second 10-year maintenance plan for the Kentucky portion of the Campbell-Clermont, Kentucky-Ohio maintenance area for the 2010 1-hour sulfur dioxide National Ambient Air Quality Standards. The EPA is proposing to approve this SIP revision because the Commonwealth has demonstrated that it is consistent with the Clean Air Act.
Comments close Oct 26, 2026
Notice is hereby given that the State of Arkansas is revising its approved Public Water System Supervision (PWSS) program. Arkansas has adopted the Environmental Protection Agency (EPA) drinking water rules for the Consumer Confidence Report Rule Revisions. Therefore, the EPA intends to approve this PWSS program revision package.
Comments close Oct 23, 2026
On February 28, 2025, the State of North Carolina, through the North Carolina Department of Environmental Quality, Division of Air Quality (NCDAQ), submitted a request for the U.S. Environmental Protection Agency (EPA) to approve a State Implementation Plan (SIP) revision containing the State's plan for maintaining the 2008 ozone National Ambient Air Quality Standard (NAAQS) through 2035 for the North Carolina portion of the bi-state Charlotte-Rock Hill, North Carolina-South Carolina 2008 8-hour ozone nonattainment area (the entire area is hereinafter referred to as the "bi-state Charlotte Area" and the North Carolina portion is hereinafter referred to as the "Charlotte Area"). The EPA is proposing to approve and incorporate North Carolina's second 10-year maintenance plan to maintain attainment of the 2008 8-hour ozone NAAQS in the bi-state Charlotte Area, including the 2018 and 2035 motor vehicle emission budgets (budgets) for nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC) for the Charlotte Area, into the SIP. The EPA is also notifying the public of the status of the EPA's adequacy determination for the sub-area budgets for the Charlotte Area.
Comments close Oct 23, 2026
The Environmental Protection Agency (EPA) is proposing to approve the negative declaration submitted by the District of Columbia Department of Energy and Environment (DCDOEE) on May 21, 2026. The negative declaration submitted by DCDOEE certifies that there are no existing other solid waste incinerators (OSWI) subject to sections 111(d) and 129 of the Clean Air Act (CAA) within the jurisdiction of the District of Columbia (DC).
Comments close Oct 14, 2026
The U.S. Environmental Protection Agency (EPA or "Agency") is proposing to issue a clean data determination (CDD) for the Sacramento Metro, California nonattainment area to reflect our finding that the area is attaining the 1997 8-hour ozone national ambient air quality standards (NAAQS or "standards"). This finding is based on quality-assured and certified ambient air quality monitoring data from 2023 through 2025. If we finalize this CDD, certain Clean Air Act (CAA) requirements that apply to the Sacramento Metro area will be suspended for so long as the area continues to attain the 1997 8-hour ozone NAAQS. We are taking comments on this proposal and plan to follow with a final action.
Comments close Oct 14, 2026
The Environmental Protection Agency (EPA) is proposing to approve the negative declaration submitted by the Maryland Department of the Environment (MDE) on April 17, 2026. The negative declaration submitted by MDE certifies that there are no existing other solid waste incinerators (OSWI) subject to sections 111(d) and 129 of the Clean Air Act (CAA) within the jurisdiction of the State of Maryland.
Comments close Oct 14, 2026
The purpose of this supplemental notice of proposed rulemaking is for the U.S. Environmental Protection Agency (EPA) and the Department of the Army ("the agencies") to supplement and seek additional comment on certain aspects of an earlier proposal, published on November 20, 2025, to revise the regulations defining the scope of waters federally covered under the Clean Water Act in light of the U.S. Supreme Court's 2023 decision in Sackett v. Environmental Protection Agency. As stated in the agencies' November 20, 2025 Notice of Proposed Rulemaking (NPRM), the agencies intend for this rulemaking to provide greater regulatory certainty and increase Clean Water Act program predictability and consistency by clarifying the definition of "waters of the United States." After consideration of the public comments received on the NPRM, the agencies are issuing this notice to supplement the NPRM with additional regulatory options on certain aspects of the proposed rule.
Comments close Oct 9, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing to repeal a final rule published in the Federal Register on December 2, 2024, partially approving and partially disapproving North Dakota's 2022 regional haze State Implementation Plan (SIP) submission for the second implementation period. As a result, the EPA is proposing to approve the portions of North Dakota's 2022 SIP submission for the second implementation period that were disapproved in the EPA's 2024 partial approval/partial disapproval. In the December 2024 final rule, the EPA determined that North Dakota submitted a regional haze SIP that did not meet all the statutory and regulatory requirements for the regional haze second implementation period. On January 31, 2025, and February 6, 2025, EPA received petitions for reconsideration from the State of North Dakota, Basin Electric Power Cooperative, Lignite Energy Council (LEC), Rainbow Energy Center, and the Coyote Station Co-Owners. On January 31, 2025, the State of North Dakota, Montana-Dakota Utilities Company, NACCO Natural Resources Corporation, Basin Electric Power Cooperative, Rainbow Energy Center, and Lignite Energy Center filed petitions for review in the Eighth Circuit Court of Appeals. EPA granted reconsideration on April 30, 2025, sending letters to the State of North Dakota, Basin Electric, LEC, Rainbow Energy Center, and Coyote Station Co-Owners. The petitions for review were held in abeyance by the Eighth Circuit on June 4, 2025 pending the administrative reconsideration process.
Comments close Oct 9, 2026
The U.S. Environmental Protection Agency (EPA) proposes to revise a regulatory definition under the Clean Water Act (CWA) permitting regulations pertaining to discharges in the contiguous zone and ocean. The proposal would revise the regulatory definition of "discharge of a pollutant" to reflect and faithfully implement the statutory exclusion of vessels and other floating craft that add pollutants in the contiguous zone or the ocean from inclusion in the definition of "discharge of a pollutant" or "discharge", and thus, from National Pollutant Discharge Elimination System (NPDES) program requirements. The proposed rulemaking would also make conforming and clarifying changes to the NPDES regulatory exclusion for vessels and other floating craft. The effect of these changes would be that the addition of pollutants by a vessel or other floating craft in the contiguous zone or the ocean that is not secured to the seabed would not be a discharge and would not require CWA NPDES permit authorization to add pollutants to those waters.
Comments close Oct 19, 2026
Pursuant to the Federal Clean Air Act (CAA or the Act), the U.S. Environmental Protection Agency (EPA or Agency) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Mississippi, through the Mississippi Department of Environmental Quality (MDEQ), on January 27, 2022, for the purpose of complying with the "good neighbor" provision of the CAA for the 2010 1-hour sulfur dioxide (SO<INF>2</INF>) primary National Ambient Air Quality Standard (NAAQS). The good neighbor provision requires each State's implementation plan to contain adequate provisions prohibiting the interstate transport of air pollution in amounts that will contribute significantly to nonattainment, or interfere with maintenance, of a NAAQS in any other State. In this proposed rulemaking, the EPA is proposing to determine that Mississippi will not contribute significantly to nonattainment or interfere with maintenance of the 2010 1-hour SO<INF>2</INF> primary NAAQS in any other State. Therefore, the EPA is proposing to approve the January 27, 2022, SIP revision as meeting the requirements of the good neighbor provision for the 2010 1-hour SO<INF>2</INF> primary NAAQS.
Comments close Sep 17, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing to approve a State Implementation Plan (SIP) revision submitted by the Commonwealth of Kentucky through the Energy and Environment Cabinet (Cabinet), Division of Air Quality (Division), on July 23, 2024. The SIP revision consists of a Limited Maintenance Plan (LMP) for the Kentucky portion of the tri-state Cincinnati-Hamilton 1997 8-hour ozone nonattainment area (the "tri-state Cincinnati-Hamilton Area"). The Kentucky portion of the tri-state Cincinnati-Hamilton Area is composed of Boone, Campbell, and Kenton Counties in Kentucky (hereinafter also referred to as the "Northern Kentucky Area"). The EPA is proposing to approve Kentucky's LMP for the Northern Kentucky Area because it provides for the maintenance of the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS) within the tri-state Cincinnati-Hamilton Area through the end of the second 10-year portion of the maintenance period. The effect of this proposed action would be to make certain commitments related to maintenance of the 1997 8-hour ozone NAAQS in the Northern Kentucky Area federally enforceable as part of the Kentucky SIP.
Comments close Sep 17, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing to approve a State Implementation Plan (SIP) revision submitted by the Commonwealth of Kentucky through the Energy and Environment Cabinet (Cabinet) on behalf of the Louisville Metro Air Pollution Control District (District) via a letter dated June 3, 2024. The SIP revision consists of a Limited Maintenance Plan (LMP) for the Kentucky portion of the bi-state Louisville, Kentucky-Indiana 1997 8- hour ozone maintenance area (the "bi-state Louisville Area"). The Kentucky portion of the bi-state Louisville Area includes the Bullitt, Jefferson, and Oldham Counties of Kentucky (the "Louisville Area"). The EPA is proposing to approve the Louisville Area's LMP because it provides for the maintenance of the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS) within the bi-state Louisville Area through the end of the second 10-year portion of the maintenance period. The effect of this proposed action would be to make certain commitments related to maintenance of the 1997 8-hour ozone NAAQS in the Louisville Area federally enforceable as part of the Kentucky SIP.
Comments close Sep 17, 2026
Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is proposing to approve the State implementation plan (SIP) revision submitted by the State of Oklahoma on March 12, 2026, (Oklahoma's 2026 SIP submission) for the regional haze program's first implementation (planning) period. Oklahoma's 2026 SIP submission revises previously approved source-specific requirements for the American Electric Power/Public Service of Oklahoma (AEP/PSO) Northeastern Power Station as part of the State's long-term strategy for the first planning period. The EPA is proposing to find that this SIP revision meets the requirements of the CAA and the Regional Haze Rule.
Comments close Sep 28, 2026
The Environmental Protection Agency (EPA) is proposing to approve the negative declaration submitted by the Allegheny County Health Department (ACHD) on March 25, 2026. The negative declaration submitted by ACHD certifies that there are no existing large municipal waste combustors (LMWC) subject to the Clean Air Act (CAA) requirements within the jurisdiction of Allegheny County.
Comments close Sep 28, 2026
Pursuant to the Clean Air Act, the Environmental Protection Agency is proposing to approve a negative declaration for oil and natural gas facilities within the Commonwealth of Puerto Rico. This negative declaration formally certifies that there are no existing crude oil or natural gas facilities in the jurisdiction of Puerto Rico that must comply with the Emission Guidelines for Greenhouse Gas Emissions from Existing Crude Oil and Natural Gas Facilities.
Comments close Sep 28, 2026
The Environmental Protection Agency (EPA) is proposing to approve the negative declarations submitted by the Philadelphia Air Management Services (AMS) on January 13, 2026. The negative declarations submitted by AMS certify that there are no existing commercial and industrial solid waste incinerators (CISWI), large municipal waste combustors (LMWC), small municipal waste combustors (SMWC), or other solid waste incinerators (OSWI) subject to the Clean Air Act (CAA) requirements within the jurisdiction of the City of Philadelphia.
Comments close Sep 28, 2026
The Environmental Protection Agency (EPA) is issuing a Notice of Intent to partially delete three sites from the National Priorities List (NPL) and requests public comments on this proposed action. The NPL, promulgated pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) of 1980, as amended, is an appendix of the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). The EPA and the applicable states, through their designated state agency, have determined that all appropriate response actions under CERCLA have been completed. However, this deletion does not preclude future actions under Superfund.
Comments close Sep 21, 2026
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing Unit II. of this document identifies certain petitions received in 2024, 2025, and 2026 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Comments close Sep 21, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing to approve changes to South Carolina's State Implementation Plan (SIP) to revise regulations prescribing minor source permit program requirements, including minor new source review (NSR) requirements, in SIP revisions submitted by the State of South Carolina on October 1, 2007, July 18, 2011, August 8, 2014, April 24, 2020, and July 23, 2025. This action is being proposed pursuant to the Clean Air Act (CAA or Act).
Comments close Sep 18, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing to partially approve and partially conditionally approve changes to South Carolina's State Implementation Plan (SIP) to revise source testing requirements and regulations prescribing control requirements for certain stationary sources of nitrogen oxides (NO<INF>X</INF>) submitted by the State of South Carolina, through the South Carolina Department of Environmental Services (SC DES), on October 1, 2007; July 27, 2016; September 5, 2017; April 24, 2020; and February 4, 2022. This action is being proposed pursuant to the Clean Air Act (CAA or Act).
Comments close Sep 18, 2026
The U.S. Environmental Protection Agency (EPA or Agency) is proposing action on changes to South Carolina's State Implementation Plan (SIP) to revise regulations prescribing minor source permitting program requirements, including minor new source review (NSR) requirements, involving, in part, minor source permitting public participation, in SIP revisions submitted by the State of South Carolina through the South Carolina Department of Health and Environmental Control (SC DHEC) on October 1, 2007; July 18, 2011; August 8, 2014; July 27, 2016; and April 24, 2020. This proposal supplements previous proposals the EPA published on August 17, 2017, and January 21, 2025. This proposal is being issued pursuant to the Clean Air Act (CAA or Act).
Comments close Sep 18, 2026
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing. Unit II. of this document identifies certain petitions received in 2025 and 2026 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Comments close Sep 16, 2026
The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision submitted by the Commonwealth of Virginia (the Commonwealth or Virginia). This revision pertains to the Commonwealth's plan, submitted by the Virginia Department of Environmental Quality (VADEQ), for maintaining the 1997 8-hour ozone national ambient air quality standard (NAAQS) (referred to as the 1997 ozone NAAQS) in the Madison & Page Counties (Shenandoah NP), VA, Area (Shenandoah NP Area or Area) for the second 10-year maintenance period. This action is being taken under the Clean Air Act (CAA).
Comments close Sep 14, 2026
The Environmental Protection Agency (EPA) is proposing to approve portions of a state implementation plan (SIP) revision submitted by the State of Missouri on September 6, 2023, as meeting Clean Air Act (CAA) requirements for the 2015 8-hour ozone national ambient air quality standards (NAAQS) in the Missouri portion of the St. Louis, MO-IL bi-state nonattainment area. Specifically, the EPA is proposing approval of the submitted vehicle inspection and maintenance (I/M) program, nonattainment new source review (NNSR) program, and reasonably available control technology (RACT) determinations for major sources of volatile organic compounds (VOC) and Nitrogen Oxides (NO<INF>X</INF>) SIP elements as meeting applicable Moderate nonattainment area requirements for the 2015 8-hour ozone NAAQS. The EPA will address the remaining SIP elements in a separate action.
Comments close Sep 14, 2026
The Environmental Protection Agency (EPA) is proposing to approve the State Implementation Plan (SIP) submission from Iowa addressing the Clean Air Act (CAA or Act) interstate transport requirements, also known as the "good neighbor" provision, for the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) National Ambient Air Quality Standard (NAAQS). The good neighbor provision requires each State's plan to contain adequate provisions prohibiting the interstate transport of air pollution in amounts that will contribute significantly to nonattainment, or interfere with maintenance, of a NAAQS in any other State. The EPA's proposed approval of this rule revision is being done in accordance with the requirements of the CAA.
Comments close Sep 14, 2026
The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision request submitted by Virginia Department of Environmental Quality (VADEQ) on behalf of the Commonwealth of Virginia. The SIP revisions intend to make some sections of Virginia regulation Revision D22 that became effective on November 23, 2022 federally enforceable. The revisions limit the authority of the Virginia State Air Pollution Control Board (Board) to the issuance of regulations, and transfer the board's existing authority to issue permits, orders, and variances to VADEQ. Additionally, the revisions establish procedures for public comment on pending controversial permits and regulatory changes, and amend certain other procedural requirements related to VADEQ's issuance of permits. This action is being taken under the Clean Air Act (CAA).
Comments close Sep 14, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve and conditionally approve revisions to the Maricopa County Air Quality Department (MCAQD or "County") portion of the Arizona State Implementation Plan (SIP). These revisions concern emissions of volatile organic compounds (VOC) from loading organic liquids and gasoline. We are proposing action on local rules to regulate these emission sources under the Clean Air Act (CAA or "Act"). We are also proposing to approve and conditionally approve the MCAQD's reasonably available control technology (RACT) demonstration for the source categories associated with these rules for the 2008 8-hour ozone national ambient air quality standards (NAAQS) in the Phoenix-Mesa ozone nonattainment area.
Comments close Sep 10, 2026
The U.S. Environmental Protection Agency (EPA) is making an interim final determination that the Arizona Department of Environmental Quality (ADEQ) has submitted rules on behalf of the Maricopa County Air Quality Department (MCAQD or "County") that addresses deficiencies in its Clean Air Act (CAA or "Act") State Implementation Plan (SIP) concerning emissions of volatile organic compounds (VOC) from loading of organic liquids and gasoline. This determination is based on a proposed approval of MCAQD Rule 352 and conditional approval of MCAQD Rule 353, published elsewhere in this issue of the Federal Register, that regulate this category of sources. The effect of this interim final determination is that the application of offset and highway sanctions that was triggered by a previous limited disapproval by the EPA in 2025 is now deferred. If the EPA finalizes its approval and conditional approval of MCAQD's submission, relief from these sanctions will become permanent.
Comments close Sep 10, 2026
The Environmental Protection Agency (EPA) is proposing to grant a Clean Air Act (CAA or Act) petition submitted by the state of New Hampshire on December 24, 2025. The petition requests that the EPA remove the State of New Hampshire from the Ozone Transport Region (OTR) based on New Hampshire's continued attainment of the ozone National Ambient Air Quality Standards (NAAQS) and technical analyses demonstrating that the additional control of emissions from the state will not significantly contribute to ozone attainment in any area in the OTR. The OTR was established by the 1990 Clean Air Act Amendments and included the States of Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, the District of Columbia, and portions of northern Virginia.
Comments close Sep 25, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to conditionally approve a State Implementation Plan (SIP) revision submitted by the State of New Hampshire on December 24, 2025, through the New Hampshire Department of Environmental Services (NHDES). The proposed revision would remove the Statewide motor vehicle inspection and maintenance (I/M) program as an active measure, which was previously approved into the SIP to address emissions from on-road sources. In accordance with plan revision requirements of the Clean Air Act (CAA), the SIP submittal contains a demonstration that the removal of the I/M program will not interfere with New Hampshire's compliance with any National Ambient Air Quality Standard (NAAQS) or with any applicable requirement of the CAA. In a letter to the EPA, NHDES committed to submitting an additional SIP revision within one year of a final conditional approval to address maintenance plan requirements.
Comments close Sep 25, 2026
The Environmental Protection Agency (EPA) is proposing to partially approve and partially disapprove a revision to the Arizona State implementation plan (SIP) as meeting the requirements of the Clean Air Act (CAA) for the implementation, maintenance, and enforcement of the 2012 fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard (NAAQS or "standards"). The EPA is proposing to approve the portions of Arizona's submission addressing prevention of significant deterioration (PSD) requirements in the permitting jurisdictions of the Arizona Department of Environmental Quality (ADEQ), Maricopa County Air Quality Department (MCAQD), and Pinal County Air Quality Control District (PCAQCD). The EPA is proposing to disapprove the portions of the Arizona submission addressing PSD requirements in the Pima County Department of Environmental Quality (PDEQ) permitting jurisdiction.
Comments close Jun 13, 2024
The U.S. Environmental Protection Agency (EPA) is proposing to approve revisions to 35 Illinois Administrative Code (IAC) parts 217, 218, and 219 into the Illinois State Implementation Plan (SIP). The Illinois Environmental Protection Agency (Illinois or Illinois EPA) submitted these revisions on December 18, 2024, and May 12, 2025, supplemented their submittal on August 13, 2025, for Moderate Reasonably Available Control Technology (RACT). The EPA is proposing to approve 35 IAC parts 217, 218, and 219 as satisfying the Moderate Volatile Organic Compound (VOC) RACT and NO<INF>X</INF> RACT requirements as well as Serious NO<INF>X</INF> RACT requirements for the Chicago, IL (Cook County, DuPage County, Grundy County, Kane County, Kendall County, Lake County, McHenry County, and Will County) and Metro-East St. Louis (Madison County, Monroe County, and St. Clair County) nonattainment areas under the 2015 ozone National Ambient Air Quality Standard (NAAQS or standard).
Comments close Sep 8, 2026
The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision and redesignation request submitted on September 19, 2025 by the Pennsylvania Department of Environmental Protection (PADEP). The SIP revision asks the EPA to redesignate the Warren County, Pennsylvania area from nonattainment to attainment for the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) national ambient air quality standard (NAAQS). The revision also asks the EPA to approve into the SIP the Commonwealth's maintenance plan for the 2010 1-hour primary SO<INF>2</INF> NAAQS for the Warren County area. Furthermore, Pennsylvania requests that the EPA correct source- specific requirements for United Refining Company within the Pennsylvania SIP that were previously included in error. This proposed action is being taken under the Clean Air Act (CAA).
Comments close Aug 31, 2026
The Environmental Protection Agency (EPA) is proposing to approve revisions to the Missouri State Implementation Plan (SIP) received on February 10, 2026. The submission revises Missouri's regulation on construction permit exemptions in their Minor New Source Review (NSR) program. These revisions refine exemptions for emergency generators, update references to other rules, and update recordkeeping requirements. The EPA is proposing to approve this rule revision pursuant to the Clean Air Act (CAA).
Comments close Aug 31, 2026
The Environmental Protection Agency (EPA) is proposing to approve revisions to four State of California air districts' Clean Air Act title V program rules to remove emergency affirmative defense provisions. The four districts are the Amador County Air Pollution Control District (ACAPCD), the Calaveras County Air Pollution Control District (CCAPCD), the Great Basin Unified Air Pollution Control District (GBUAPCD), and the Northern Sierra Air Quality Management District (NSAQMD) ("Districts"). This proposed action is being taken in accordance with Federal regulations and the Clean Air Act (CAA or "Act"). We are taking comments on these proposed revisions and plan to follow with a final action.
Comments close Aug 31, 2026
EPA is proposing significant new use rules (SNURs) under the Toxic Substances Control Act (TSCA) for certain chemical substances that were the subject of premanufacture notices (PMNs) and are also subject to an Order issued by EPA pursuant to TSCA. Once finalized, the SNURs would require persons who intend to manufacture (defined by statute to include import) or process any of these chemical substances for an activity that is proposed as a significant new use by this rulemaking to notify EPA at least 90 days before commencing that activity. The required notification initiates EPA's evaluation of the conditions of that use for that chemical substance. In addition, the manufacture or processing for the significant new use may not commence until EPA has conducted a review of the required notification, made an appropriate determination regarding that notification, and taken such actions as required by that determination.
Comments close Aug 31, 2026
The Environmental Protection Agency (EPA) is proposing to approve a request from the Michigan Department of Environment, Great Lakes, and Energy (EGLE) to redesignate the Detroit, Michigan area to attainment for the 2015 ozone National Ambient Air Quality Standards (NAAQS) because the request meets the statutory requirements for redesignation under the Clean Air Act (CAA). EGLE submitted this request on January 3, 2022, and submitted a supplement to this request on May 18, 2026. The EPA is also proposing to approve, as a revision to the Michigan State Implementation Plan (SIP), the State's updated maintenance plan for the 2015 ozone NAAQS through 2040 in the Detroit area, including motor vehicle emissions budgets for 2035 and 2040, for both volatile organic compound (VOC) and oxides of nitrogen (NO<INF>X</INF>). The EPA is also initiating the adequacy process for these maintenance plan budgets. Additionally, the EPA is proposing to adjust the SIP submission and control measure implementation deadlines for certain Moderate requirements. Finally, the EPA is proposing to take final agency action on an exceptional events request submitted by EGLE on April 15, 2026, and concurred on by the EPA on June 4, 2026.
Comments close Aug 27, 2026
The Environmental Protection Agency (EPA) is proposing to approve the Michigan Department of Environment, Great Lakes, and Energy's (EGLE's) December 26, 2025, requests to redesignate the Berrien and Muskegon areas to attainment for the 2015 ozone NAAQS because the requests meet the statutory requirements for redesignation under the Clean Air Act (CAA). The Berrien area includes Berrien County, and the Muskegon area includes the western portion of Muskegon County. The EPA is proposing to approve, as revisions to the Michigan State Implementation Plan (SIP), the State's plans for maintaining the 2015 ozone NAAQS through 2036 in the Berrien and Muskegon areas. The EPA is initiating the adequacy process and proposing to approve Michigan's 2032 and 2036 volatile organic compound (VOC) and oxides of nitrogen (NO<INF>X</INF>) motor vehicle emissions budgets (budgets) for the Berrien and Muskegon areas. Pursuant to section 110 and part D of the CAA, the EPA is proposing to approve the enhanced monitoring plan (EMP) of ozone and ozone precursors SIP revision submitted by Michigan on January 12, 2026, because it satisfies Serious SIP requirements of the CAA for the Berrien and Muskegon areas. The EPA is also proposing to approve the Serious VOC reasonably available control technology (RACT) SIP revision and CAA section 182(f) waiver from Serious NO<INF>X</INF> RACT requirements for the Berrien and Muskegon areas under the 2015 ozone NAAQS submitted by EGLE to the EPA on May 5, 2026.
Comments close Aug 27, 2026
The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of New Jersey for purposes of certifying and meeting the requirements for Reasonably Available Control Technology (RACT) for the Serious classification of the 2008 and the Moderate classification of the 2015 8-hour ozone National Ambient Air Quality Standards (NAAQS). EPA is also proposing to approve that the SIP revisions fulfill SIP requirements pertaining to the Ozone Transport Region (OTR) for the 2015 Ozone NAAQS. These actions are being taken in accordance with the requirements of the Clean Air Act (CAA).
Comments close Aug 24, 2026
The Environmental Protection Agency (EPA) is proposing to approve under the Clean Air Act (CAA), the Second Maintenance Plan for the Harrisburg-Lebanon-Carlisle and York Maintenance Area (Harrisburg- York Area) for the 2006 Fine Particulate Matter national ambient air quality standard (NAAQS) (Second 10-Year Maintenance Plan) as a revision to the state implementation plan (SIP). The SIP revision, submitted on February 7, 2025 by the Pennsylvania Department of Environmental Protection (PADEP), addresses the second 10-year maintenance period for particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers ([micro]m), commonly known as fine particulate matter or PM<INF>2.5</INF>. The Plan includes, among other elements, a base year emissions inventory, a maintenance demonstration, contingency provisions, and motor vehicle emissions budgets for use in transportation conformity determinations, to ensure the continued maintenance of the 2006 PM<INF>2.5</INF> NAAQS. The EPA is also proposing to find adequate and approve the motor vehicle emission budgets for the Harrisburg-York Area.
Comments close Aug 24, 2026
The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision submitted by the Pennsylvania Department of Environmental Protection on behalf of the Commonwealth of Pennsylvania. This revision pertains to previously approved, source-specific reasonably available control technology (RACT) requirements for the Equitrans, Inc. Hartson Compressor Station in Washington County, Pennsylvania. This proposed action is being taken under the Clean Air Act (CAA).
Comments close Aug 24, 2026
EPA is proposing significant new use rules (SNURs) under the Toxic Substances Control Act (TSCA) for certain chemical substances that were the subject of premanufacture notices (PMNs) and are also subject to an Order issued by EPA pursuant to TSCA. Once finalized, the SNURs would require persons who intend to manufacture (defined by statute to include import) or process any of these chemical substances for an activity that is proposed as a significant new use by this rulemaking to notify EPA at least 90 days before commencing that activity. The required notification initiates EPA's evaluation of the conditions of that use for that chemical substance. In addition, the manufacture or processing for the significant new use may not commence until EPA has conducted a review of the required notification, made an appropriate determination regarding that notification, and taken such actions as required by that determination.
Comments close Aug 24, 2026
The Environmental Protection Agency (EPA) is taking direct final action to accept a negative declaration submitted by the Nebraska Department of Water, Energy, and Environment (NDWEE) to satisfy the emission guidelines and associated compliance times requirements for Commercial and Industrial Solid Waste Incineration (CISWI) units for the State of Nebraska. The negative declaration certifies that there are no existing sources within the jurisdiction of Nebraska that must comply with the rule. This action is being taken in accordance with the Clean Air Act (CAA) requirements for emission guidelines and state plans for existing sources.
Comments close Aug 17, 2026
The Environmental Protection Agency (EPA) is proposing to accept a negative declaration submitted by the Nebraska Department of Water, Energy, and Environment (NDWEE) to satisfy the emission guidelines and associated compliance times requirements for Commercial and Industrial Solid Waste Incineration (CISWI) units for the State of Nebraska. The negative declaration certifies that there are no existing sources within the jurisdiction of Nebraska that must comply with the rule. This action is being taken in accordance with the Clean Air Act (CAA) requirements for emission guidelines and state plans for existing sources. In the "Rules and Regulations" section of this Federal Register, we are approving the State's negative declaration submission as a direct final rule without a prior proposed rule. If we receive no adverse comment, we will not take further action on this proposed rule.
Comments close Aug 17, 2026
The Environmental Protection Agency (EPA) is making an interim final determination (IFD) that Pennsylvania has submitted revisions to the state implementation plan (SIP) that satisfy the requirements under the Clean Air Act (CAA) to implement Reasonably Available Control Technology (RACT) for volatile organic compounds (VOC) Control Technique Guidelines (CTG) for the 2008 ozone national ambient air quality standards (NAAQS). The effect of this IFD is to stay emission offset sanctions and defer the imposition of highway funding sanctions triggered by an August 16, 2024 EPA disapproval of a prior Pennsylvania SIP addressing VOC CTG RACT requirements for the 2008 ozone NAAQS. This IFD is consistent with a proposed action, published elsewhere in this issue of the Federal Register, in which the EPA is proposing approval of revisions to Pennsylvania's SIP, as submitted on May 10, 2023, January 20, 2026, February 17, 2026 and April 10, 2026 to address VOC CTG RACT requirements for the 2008 and 2015 NAAQS.
Comments close Aug 17, 2026
The Environmental Protection Agency (EPA) is proposing to approve four state implementation plan (SIP) revisions submitted by the Commonwealth of Pennsylvania received on May 10, 2023, January 20, 2026, February 17, 2026, and April 10, 2026, through the Pennsylvania Department of Environmental Protection (PADEP). The SIP revisions address reasonably available control technology (RACT) requirements for the 2008 and 2015 ozone national ambient air quality standards (NAAQS) relating to control technique guidelines (CTGs) for volatile organic compounds (VOC) via previously adopted CTG regulations, three new CTG regulations and four facilities covered by the CTG for the Manufacture of High-Density Polyethylene, Polypropylene, and Polystyrene Resins respectively. This action is being taken under the Clean Air Act (CAA).
Comments close Aug 17, 2026
The Environmental Protection Agency (EPA) is proposing to approve a revision to the State of Wisconsin's State Implementation Plan (SIP) for the Oak Creek Power Plant located in Oak Creek, Wisconsin. The EPA is proposing to approve alternative nitrogen oxides (NO<INF>X</INF>) emissions limits for the Oak Creek facility. The alternative limits will allow the facility to operate in compliance with State and Federal regulations, and emit less NO<INF>X</INF> over time as compared to current limits. This proposed action will not interfere with the National Ambient Air Quality Standards (NAAQS) and meets all applicable requirements under the Clean Air Act (CAA).
Comments close Aug 14, 2026
Pursuant to applicable requirements under the Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is proposing to approve a revision to the State of New York's State Implementation Plan (SIP) for the ozone National Ambient Air Quality Standard (NAAQS) related to a source-specific SIP (SSSIP) revision for Castleton Energy Center, located at 1902 River Road, Castle-on-Hudson, New York 12033 (herein referred to CEC, or the Facility). The EPA is proposing to find that the control option in this SSSIP revision is Reasonably Available Control Technology (RACT) with respect to oxides of nitrogen (NO<INF>X</INF>) emissions from the relevant Facility emission source, i.e., a combined-cycle combustion turbine generator with an associated heat recovery steam generator equipped with a duct burner, and a steam generator, identified as emission unit 1-0GTDB in the Facility's CAA Title V operating permit. This SSSIP revision is intended to implement NO<INF>X</INF> RACT for the relevant Facility source in accordance with the requirements for implementation of the 2008 and 2015 ozone NAAQS. The EPA proposes to determine that this action will not interfere with ozone NAAQS requirements and meets all applicable requirements of the Act.
Comments close Aug 14, 2026
The Environmental Protection Agency (EPA) is proposing to approve revisions to the Missouri State Implementation Plan (SIP) related to Control of Nitrogen Oxide (NO<INF>X</INF>) Emissions From Large Stationary Internal Combustion Engines. The revisions reformat and revise reporting, recordkeeping, and compliance requirements; incorporate other state rules by reference; add definitions specific to the rule; revise unnecessarily restrictive or duplicative language; and make administrative wording changes. The revisions also add an exemption for certain spark-ignited internal combustion engines. The EPA's proposed approval is pursuant to, and consistent with, the requirements of the Clean Air Act (CAA).
Comments close Aug 14, 2026
The Environmental Protection Agency (EPA or the Agency) is proposing to approve the Alabama partial Coal Combustion Residuals (CCR) permit program under the Resource Conservation and Recovery Act (RCRA). After reviewing the CCR permit program application submitted by the Alabama Department of Environmental Management (ADEM) on May 18, 2026, EPA has preliminarily determined that Alabama's partial CCR permit program meets the standard for approval under RCRA. If approved, Alabama's CCR permit program will operate in lieu of the Federal CCR program, with the exception of the specific provisions noted below. EPA is seeking comment on this proposal during a 60-day public comment period and will be holding a virtual public hearing on EPA's preliminary approval of Alabama's partial CCR permit program.
Comments close Sep 14, 2026
The Environmental Protection Agency (EPA) issued a proposed rule on February 20, 2020, to establish a Federal permit program for disposal of coal combustion residuals (CCR). On April 13, 2026, the EPA proposed to establish new compliance pathways that would allow site- specific considerations to be taken into account during permitting for owners or operators of CCR units complying with groundwater monitoring, corrective action, and closure requirements under a federal or participating-State CCR permit. The EPA is considering whether a general permit could be developed to allow such facilities to temporarily obtain permit coverage until an individual permit issued by EPA or an approved state CCR permit program is in effect. This advance notice of proposed rulemaking (ANPRM) does not propose any regulatory requirements or change any existing regulatory requirements.
Comments close Oct 13, 2026
The U.S. Environmental Protection Agency (EPA) is proposing regulatory amendments to certain compliance provisions and test procedures related to model year (MY) 2027 and later heavy-duty highway engines. These amendments would include changes to the regulatory useful life periods and the emission-related warranty periods. The EPA also proposes to add clarity to certain regulatory compliance provisions and correct errors in the regulations to support the MYs 2027 and later program for heavy-duty highway engines and vehicles. This includes certain amendments related to provisions adopted in January 2023 as well as other provisions adopted in earlier rules. The EPA also proposes to make nonconformance penalties (NCPs) available to manufacturers of medium heavy-duty engines (Medium HDE) and heavy heavy-duty engines (Heavy HDE) beginning in MY 2027. In addition, the EPA proposes to amend the requirements for selective catalytic reduction (SCR) system inducement provisions for newly manufactured diesel-fueled highway engines and vehicles (i.e., light- and medium- duty vehicles and heavy-duty engines) and nonroad engines and equipment. The EPA is also considering new inducement guidance for in- use highway and nonroad diesel engines, vehicles, and equipment.
Comments close Aug 29, 2026
The Environmental Protection Agency (EPA) is proposing to approve revisions to the State of California's State Implementation Plan (SIP) for the San Joaquin Valley (SJV) area. The revisions consist of an update to the SJV area's motor vehicle emissions budgets ("budgets") for nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC) for the 2008 8-hour ozone national ambient air quality standard (NAAQS or "standard"). These updated budgets for 2026, 2029, and 2031 were developed with the latest modeling method approved for California. These updated budgets apply to all subareas within SJV. If the EPA approves these budgets, they would supersede the existing approved SJV subarea budgets for the 2008 ozone NAAQS that were based on an earlier emissions model. The EPA is proposing to approve the updated SJV ozone budgets in accordance with the requirements of the Clean Air Act (CAA or "Act") and the EPA's regulations.
Comments close Aug 10, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to revise the public participation regulatory requirements for sources subject to Clean Air Act (CAA) New Source Review (NSR) programs approved into State Implementation Plans (SIPs). Specifically, the EPA is proposing to recognize in regulation that State and local air quality regulatory authorities ("air agencies") determine, pursuant to the CAA, whether, when, and to what extent public participation in minor NSR programs is necessary to assure the National Ambient Air Quality Standards (NAAQS) are achieved. If finalized, the changes effected by this rulemaking would provide State and local air agencies with greater discretion to identify the requisite level of public participation that is appropriate in their minor NSR programs, which regulate individual authorizations to construct minor stationary sources and minor modifications to existing stationary sources.
Comments close Aug 21, 2026
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing. Unit II. of this document identifies certain petitions received in 2025 and 2026 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Comments close Aug 5, 2026
The U.S. Environmental Protection Agency (EPA) is proposing a Federal plan to implement the revised emission guidelines for existing other solid waste incineration (OSWI) units. The EPA promulgated emission guidelines for existing OSWI units in 2005 and revised the emission guidelines on June 30, 2025. If a State or Tribe with existing OSWI units subject to the 2025 revised OSWI emission guidelines does not submit an approvable plan by June 30, 2027, the EPA will develop, implement, and enforce a Federal plan for existing OSWI units located in that State or area of Indian Country. This action proposes a Federal plan to implement the 2025 revised OSWI units emission guidelines for existing OSWI units located in States and on Tribal lands without effective State or Tribal plans by the effective date of this Federal plan.
Comments close Aug 17, 2026
The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Alabama, through the Alabama Department of Environmental Management (ADEM) on April 7, 2026. The SIP revision replaces the previously approved transportation conformity memorandum of agreement (MOA) with an updated MOA concerning transportation conformity criteria and procedures related to interagency consultation, conflict resolution, public participation, and enforceability of certain transportation-related control and mitigation measures. The SIP revision also makes a minor stylistic change to the Transportation Conformity and General Conformity rules in the Alabama SIP. EPA is proposing to determine that Alabama's April 7, 2026, SIP revision is consistent with the applicable provisions of the Clean Air Act (CAA or Act).
Comments close Aug 3, 2026
The U.S. Environmental Protection Agency (EPA or agency) is proposing the sixth Unregulated Contaminant Monitoring Rule (UCMR 6). Under the Safe Drinking Water Act (SDWA), the UCMR program gathers data about unregulated contaminant occurrence in drinking water. The proposed UCMR 6 would require public water systems (PWSs) to collect national occurrence data for seven ultrashort organofluorine compounds (including certain PFAS), three pesticide metabolites, 13 semivolatile organic compounds, and seven purgeable organic compounds. Subject to the availability of appropriations, the EPA will require all community and non-transient non-community water systems (CWSs and NTNCWSs) serving 3,300 or more people, and a representative sample of PWSs serving fewer than 3,300 people, to conduct monitoring. These contaminants are not currently subject to national primary drinking water regulations (NPDWRs), and the EPA is proposing to require the collection of drinking water occurrence data to inform agency decisions. The data collected will be publicly available. The EPA is also announcing two public meetings (via webinar) to discuss this proposal of the sixth Unregulated Contaminant Monitoring Rule (UCMR 6).
Comments close Jul 31, 2026
The Environmental Protection Agency (EPA) is proposing to approve revisions to the Mojave Desert Air Quality Management District (MDAQMD or "District") portion of the California State Implementation Plan (SIP). These revisions concern prohibitory rules that regulate emissions of volatile organic compounds (VOCs) and oxides of nitrogen (NO<INF>X</INF>) under the Clean Air Act (CAA or "Act") within the Riverside County portion of the MDAQMD portion of the California SIP. We are proposing to approve the rescissions of the rules because the requirements in the rules are no longer necessary to retain in the SIP to meet CAA requirements.
Comments close Jul 27, 2026
The United States Environmental Protection Agency (EPA or Agency) is proposing amendments to its procedures for implementing the requirements of the National Environmental Policy Act of 1969 (NEPA). This proposed rule would also include technical amendments to the Agency's procedures to improve clarity, correct errors, and update office names and titles. This proposed rule would amend EPA's NEPA implementing procedures by incorporating proposed revisions to create efficiencies in the implementation of NEPA and to harmonize EPA's NEPA Implementing Procedures with other federal agencies' procedures, where possible. The proposed rule also incorporates the amendments to NEPA enacted through the Fiscal Responsibility Act of 2023 (FRA) and the One Big Beautiful Bill Act of 2025 (OBBBA); makes changes consistent with Executive Order (E.O.) 14154, Unleashing American Energy; makes changes based on the Council on Environmental Quality's (CEQ) subsequent rescission of its NEPA regulations; and to reflect the Supreme Court's May 29, 2025 decision in Seven County Infrastructure Coalition v. Eagle County, Colorado, 605 U.S. 168(2025) (hereinafter Seven County).
Comments close Jul 27, 2026
The Environmental Protection Agency (EPA) is proposing to approve a revision to the Arizona State Implementation Plan (SIP) submitted by the Arizona Department of Environmental Quality (ADEQ). This revision includes statutes and regulations amending the Cleaner Burning Gasoline (CBG) program, which is a control measure in the greater Phoenix metropolitan area to reduce emissions of ozone-forming pollutants, carbon monoxide (CO), and particulate matter. Additionally, this revision addresses the Winter Oxygenated Fuel program to control CO emissions in the Tucson area. Finally, this revision repeals the Arizona Gasoline Set[hyphen]aside (GSA) Program, applicable to the 1971 carbon monoxide nonattainment area covering Maricopa County and a portion of Pima County. The EPA is proposing to approve this SIP revision under the Clean Air Act (CAA or "Act"). This SIP revision is administrative in nature. This action proposes to update the existing SIP-approved CBG program with revisions that have been adopted and implemented by the State to clarify requirements, update references, and enhance flexibility of the program, and it will not impose any additional costs or regulatory burdens. We are taking comments on this proposal and plan to follow with a final action.
Comments close Jul 23, 2026
The U.S. Environmental Protection Agency (EPA) is proposing to approve portions of Colorado State Implementation Plan (SIP) submittals under the Clean Air Act (CAA) that address SIP obligations related to Reasonably Available Control Technology (RACT) requirements for the 2008 ozone National Ambient Air Quality Standards (NAAQS) for the Denver-Boulder-Greeley-Ft. Collins-Loveland, Colorado ozone nonattainment area. The EPA is proposing approval of portions of the RACT SIP submittals that address reporting requirements for certain source categories and reorganize certain state air pollution regulations. The EPA is also proposing to find that the State has addressed the EPA's prior limited disapproval.
Comments close Jul 23, 2026
On April 22, 2026, the U.S. Environmental Protection Agency (EPA) proposed a rule titled "National Emission Standards for Hazardous Air Pollutants: Crude Oil and Natural Gas Production Facilities and Natural Gas Transmission and Storage Facilities; Technology Review and Reconsideration." The EPA is extending the comment period on this proposed rule, which is scheduled to close on June 22, 2026. The comment period will now end on August 6, 2026, to allow additional time for stakeholders to review and comment on the proposal.
Comments close Aug 6, 2026
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing. Unit II. of this document identifies certain petitions received in 2024 and 2025 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Comments close Jul 22, 2026
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing. Unit II. of this document identifies certain petitions received in 2023, 2024, 2025 and 2026 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Comments close Jul 15, 2026
The Environmental Protection Agency (EPA or the Agency) is extending the comment period for the proposed rule entitled "Hazardous and Solid Waste Management System: Disposal of Coal Combustion Residuals From Electric Utilities; Legacy/CCRMU Amendments." EPA is extending the comment period until June 29, 2026, in response to stakeholders' requests for a comment period extension.
Comments close Jun 29, 2026
This document announces the Agency's receipt of and solicits public comment on initial filings of pesticide petitions requesting the establishment or modification of regulations for residues of pesticide chemicals in or on various commodities. The Agency is providing this notice in accordance with the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA uses the month and year in the title to identify when the Agency compiled the petitions identified in this notice of filing. Unit II. of this document identifies certain petitions received in 2023, 2024 and 2025 that are currently being evaluated by EPA, along with information about each petition, including who submitted the petition and the requested action.
Comments close Jul 13, 2026
The U.S. Environmental Protection Agency (EPA) is reconsidering certain aspects of the January 2025 final rule entitled State Implementation Plan Submittal Deadlines and Implementation Requirements for Reclassified Nonattainment Areas Under the Ozone National Ambient Air Quality Standards ("January 2025 final rule"). Among other things, the January 2025 final rule codified a policy that certain State Implementation Plan (SIP) requirements for a prior classification remain due upon an area's reclassification to a higher classification. In this proposed action, the EPA is proposing a new interpretation that, upon reclassification, an area is subject only to those requirements in Clean Air Act (CAA) section 182 that are specific to that area's current classification. If finalized, this proposed rule would apply nationwide to all past and future reclassifications associated with the 2008, 2015, and any future ozone National Ambient Air Quality Standards (NAAQS). The EPA is not reconsidering or reopening any other aspect of the January 2025 final rule in this rulemaking and is not addressing the scope of applicable requirements for NAAQS other than the ozone NAAQS.
Comments close Jul 13, 2026
The Environmental Protection Agency (EPA) is proposing to grant an extension of the "Serious" area attainment date for the Los Angeles-South Coast Air Basin ("South Coast") nonattainment area for the 2012 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS or "standards") from December 31, 2025, to December 31, 2030, based on a proposed determination that the State has satisfied the statutory criteria for this extension. The EPA will accept comments on this proposed rule during a 30-day public comment period.
Comments close Jul 13, 2026
The Environmental Protection Agency (EPA) is proposing to grant an extension of the applicable "Serious" area attainment date for the San Joaquin Valley nonattainment area for the 2012 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS or "standards") from December 31, 2025, to December 31, 2030, based on a proposed determination that the State has satisfied the statutory criteria for this extension. The EPA will accept comments on this proposed rulemaking during a 30-day public comment period.
Comments close Jul 13, 2026
EPA is proposing significant new use rules (SNURs) under the Toxic Substances Control Act (TSCA) for certain chemical substances that were the subject of premanufacture notices (PMNs) and are also subject to an Order issued by EPA pursuant to TSCA. The SNURs require persons who intend to manufacture (defined by statute to include import) or process any of these chemical substances for an activity that is proposed as a significant new use by this rulemaking to notify EPA at least 90 days before commencing that activity. The required notification initiates EPA's evaluation of the conditions of that use for that chemical substance. In addition, the manufacture or processing for the significant new use may not commence until EPA has conducted a review of the required notification, made an appropriate determination regarding that notification, and taken such actions as required by that determination.
Comments close Jul 10, 2026
The U.S. Environmental Protection Agency (EPA) is proposing revisions to the Federal Implementation Plan (FIP) addressing regional haze in the State of Wyoming. The EPA is proposing revisions to the FIP's nitrogen oxides (NO<INF>X</INF>) best available retrofit technology (BART) requirements for the PacifiCorp Dave Johnston Power Plant Unit 3. In response to PacifiCorp's letter no longer consenting to closure of Dave Johnston Unit 3, the EPA is proposing to withdraw the NO<INF>X</INF> BART determination containing the closure requirement. Additionally, in response to a request from PacifiCorp, and in light of new information that was not available at the time the EPA originally promulgated the FIP in 2014, the Agency is also proposing to revise the other NO<INF>X</INF> BART determination for Dave Johnston Unit 3.
Comments close Jul 23, 2026
EPA is proposing significant new use rules (SNURs) under the Toxic Substances Control Act (TSCA) for certain chemical substances that were the subject of premanufacture notices (PMNs) and are also subject to an Order issued by EPA pursuant to TSCA. The SNURs require persons who intend to manufacture (defined by statute to include import) or process any of these chemical substances for an activity that is proposed as a significant new use by this rulemaking to notify EPA at least 90 days before commencing that activity. The required notification initiates EPA's evaluation of the conditions of that use for that chemical substance. In addition, the manufacture or processing for the significant new use may not commence until EPA has conducted a review of the required notification, made an appropriate determination regarding that notification, and taken such actions as required by that determination.
Comments close Jul 6, 2026
The Environmental Protection Agency (EPA or the Agency) is proposing to approve the Louisiana Coal Combustion Residuals (CCR) partial permit program under the Resource Conservation and Recovery Act (RCRA). After reviewing the CCR permit program application submitted by the Louisiana Department of Environmental Quality (LDEQ), EPA has preliminarily determined that Louisiana's CCR permit program meets the standard for partial approval under RCRA. If approved, Louisiana's CCR permit program will operate in lieu of the Federal CCR program, with the exception of the specific provisions noted below. EPA is seeking comment on this proposal during a 60-day public comment period and will hold a hybrid in-person and virtual public hearing on EPA's preliminary approval of Louisiana's partial CCR permit program.
Comments close Aug 4, 2026
Environmental Protection Agency (EPA) is proposing to amend the administrative hearing procedures for claims brought against the Hazardous Substance Superfund pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
Comments close Aug 3, 2026
Environmental Protection Agency (EPA) is proposing to rescind regulations establishing arbitration procedures for small cost recovery claims arising under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). EPA is proposing this rescission to simplify the body of Federal regulations.
Comments close Aug 3, 2026
