EPA Approved Nonregulatory Provisions and Quasi-Regulatory Measures in the Idaho SIP
Latest EPA Action: September 5, 2025
Note: The official SIPs are contained in regulations promulgated in the Federal Register and codified in the U.S. Code of Federal Regulations (CFR). EPA’s web-versions of the approved SIPs are for reference. While we make every effort to maintain the accuracy of the files accessible here, inconsistencies may occur. Please contact us if you find any errors in these files.
| Name of SIP provision | Applicable geographic or nonattainment area | State submittal date | EPA approval date | Explanations |
|---|---|---|---|---|
| Appendix A.2—Idaho Environmental Protection and Health Act, Idaho Code Section 39-101 et seq. | State-wide | 3/15/2001 | 1/16/2003 68 FR 2217 (pdf) (173 KB) | |
| Four sections of Appendix A.3—Rules and Regulations for Control of Air Pollution in Idaho—that were approved but not incorporated by reference in section (c) | State-wide | 5/17/1994 | 1/16/2003 68 FR 2217 (pdf) (173 KB) | IDAPA 58.01.01.000 (legal authority), 58.01.01.002 (written interpretations), 58.01.01.003 (administrative appeals), and 58.01.01.128 (confidential business information). |
| Idaho State Board SIP Revision; Idaho Code §§59-701 through 705; Ethics in Government Act | State-wide | 9/16/2013 | 10/24/2013 78 FR 63394 (pdf) (237 KB) | To satisfy the requirements of CAA section 128(a)(2) and CAA section 110(a)(2)(E)(ii) for all criterial pollutants. |
| Idaho Department of Environmental Quality letter dated October 18, 2013 supplementing the May 9, 2013 SIP Submittal | State-wide | 10/24/2013 | 3/3/2014 79 FR 11711 (pdf) (231 KB) | |
| Road Sanding Agreement, Idaho Transportation Department to Idaho Department of Environmental Quality (Voluntary Measure) | Franklin County, Logan UT-ID PM2.5 Nonattainment Area | 12/19/2012 | 3/25/2014 79 FR 16201 (pdf) (238 KB) | Fine Particulate Matter Control Measures; Franklin County. |
| Letter of Intent PM2.5 Reduction, Franklin County Road Department to Department of Environmental Quality (Voluntary Measure) | Franklin County, Logan UT-ID PM2.5 Nonattainment Area | 12/19/2012 | 3/25/2014 79 FR 16201 (pdf) (238 KB) | Fine Particulate Matter Control Measures; Franklin County. |
| Name of SIP provision | Applicable geographic or nonattainment area | State submittal date | EPA approval date | Explanations |
|---|---|---|---|---|
| Chapter I—Introduction | State-wide | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter II—Administration | State-wide | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter III—Emission Inventory | State-wide | 1/15/1980; 2/14/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter IV—Air Quality Monitoring | State-wide | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter V—Source Surveillance | State-wide | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter VI—Emergency Episode Plan | State-wide | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter VIII—Nonattainment Area Plans | ||||
| Chapter VIII-a | Silver Valley TSP Nonattainment Area Plan | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter VIII-b | Lewiston TSP Nonattainment Area Plan | 1/15/1980; 12/4/1980; and 2/5/1981 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter VIII-c | Transportation Control Plan for carbon monoxide, Ada County | 5/24/1984; 1/3/1985; 3/25/1985; and 6/29/1994 | 7/28/1982 6/6/1985 12/1/1994 | |
| Chapter VIII-d | Pocatello TSP Nonattainment Area Plan | 3/7/1980 and 2/5/1981 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter VIII-e | Soda Springs TSP Nonattainment Area Plan | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Chapter VIII-f | Pinehurst PM-10 Nonattainment Area Plan | 4/14/1992 | 8/25/1994 59 FR 43745 (pdf) (359 KB) | |
| Chapter VIII-g | Northern Ada County PM10 Nonattainment Area Plan | 11/14/1991; 12/30/1994; and 7/13/1995 | 5/30/1996 61 FR 27019 (pdf) (429 KB) | |
| Chapter VIII-h | Sandpoint PM10 Nonattainment Area Plan | 8/16/1996 | 6/26/2002 67 FR 43006 (pdf) (164 KB) | |
| Chapter VIII-i | Northern Ada County CO Limited Maintenance Plan | 1/17/2002 | 10/28/2002 67 FR 65713 (pdf) (148 KB) | |
| Chapter VIII-j | Ada County/Boise Idaho PM-10 Maintenance Plan | 9/27/2002; 7/10/2003; and 7/21/2003 | 10/27/2003 68 FR 61106 (pdf) (149 KB) | |
| Chapter IX—Reserved | ||||
| Chapter X—Plan for Maintenance of National Ambient Air Quality Standards for Lead | State-wide | 2/3/1984 | 6/4/1984 (EPA effective date) | |
| Small Business Assistance Program | State-wide | 1/3/1994 | 9/19/1994 59 FR 47801 (pdf) (1,653 KB) | |
| Appendix A—Legal Authority and Other Administrative Matters | State-wide | 1/15/1980 | 7/28/1982 47 FR 32530 (pdf) (2.2 MB) | |
| Northern Ada County Air Quality Maintenance Area Second 10-year Carbon Monoxide Limited Maintenance Plan | Northern Ada County | 2/10/2011 | 8/2/2012 77 FR 45962 (pdf) (242 KB) | |
| Northern Ada County Carbon Monoxide Limited Maintenance Plan Revision | Northern Ada County | 12/29/2022 | 6/15/2023 88 FR 39177 (pdf) (224 KB) | Removal of I/M Program. |
| Northern Ada County PM10 Second Ten-Year Maintenance Plan | Northern Ada County | 3/11/2013 | 10/2/2014 79 FR 59435 (pdf) (246 KB) | |
| Portneuf Valley PM10 Nonattainment Area Plan and Maintenance Plan | Portneuf Valley | 7/13/2006 | 7/13/2006 71 FR 39574 (pdf) | |
| Portneuf Valley PM10 Maintenance Plan—Revision | Portneuf Valley | 4/21/2014 | 7/17/2014 79 FR 41647 (pdf) | |
| Pinehurst PM10 Contingency Measures | Pinehurst/Shoshone County | 7/13/1995 | 10/2/2014 79 FR 59435 (pdf) (246 KB) | |
| Pinehurst PM10 Limited Maintenance Plan | Shoshone County; Pinehurst Expansion Area and City of Pinehurst | 9/29/2017 | 9/11/2018 83 FR 45830 (pdf) (249 KB) | |
| Sandpoint PM10 Nonattainment Area Limited Maintenance Plan | Bonner County: Sandpoint Area | 12/14/2011 | 4/3/2013 78 FR 20001 (pdf) (274 KB) | |
| Fine Particulate Matter Baseline Emissions Inventory | Franklin County, Logan UT-ID PM2.5 Nonattainment Area | 12/19/2012 | 7/18/2014 79 FR 41904 (pdf) (233 KB) | Fine Particulate Matter; Franklin County. |
| Cache Valley Fine Particulate Matter Attainment Plan | Franklin County, Logan UT-ID- PM2.5 Nonattainment Area | 12/19/2012, 12/24/2014, 7/31/2018 | 1/4/2017 8/8/2017 2/20/2020 | |
| Cache Valley Fine Particulate Matter Maintenance Plan | Franklin County, Logan UT-ID PM2.5 Area | 9/13/2019 | 5/21/2021 86 FR 27532 (pdf) (265 KB) | |
| West Silver Valley PM2.5 Maintenance Plan | West Silver Valley, ID | 6/2/2020 | 11/16/2021 86 FR 63315 (pdf) (249 KB) | |
| Open Burning of Crop Residue State Implementation Plan Revision | State-wide | 5/28/2008 | 8/1/2008 73 FR 44915 (pdf) (168 KB) | |
| Open Burning of Crop Residue State Implementation Plan Revision | State-wide | 9/22/2017; 10/23/2017 | 6/19/2018 83 FR 28382 (pdf) (263 KB) | Original submission and supplemental modeling analyses. |
| Interstate Transport State Implementation Plan, May 11, 2010 (see comments) | State-wide | 6/28/2010 | 11/26/2010 75 FR 72705 (pdf) (213 KB) | For the 1997 8-hour ozone NAAQS and the 1997 PM2.5 NAAQS. See docket EPA-R10-OAR-2010-0669. |
| Section 110(a)(2) Infrastructure Requirements for the 1997 8-hour Ozone NAAQS | Statewide | 9/15/2008; 6/24/2010 | 7/17/2012 77 FR 41916 (pdf) (242 KB) | This action addresses following CAA elements or portions thereof: 110(a)(2)(A), (B), (C), (D)(ii), (E)(i), (E)(iii), (F), (G), (H), (J), (K), (L), and (M). |
| Section 110(a)(2) Infrastructure Requirements for the 2008 Pb NAAQS | State-wide | 2/14/2012 | 5/22/2014 79 FR 29358 (pdf) (218 KB) | This action addresses the following CAA elements: 110(a)(2)(A), (B), (C), (D), (E), (F), (G), (H), (J), (K), (L), and (M). |
| Section 110(a)(2) Infrastructure Requirements for the 1997 PM2.5 NAAQS | State-wide | 9/15/2008; 6/28/2010 | 7/14/2014 79 FR 40662 (pdf) (239 KB) | This action addresses the following CAA elements or portions thereof: 110(a)(2)(A), (B), (C), (D)(ii), (E), (F), (G), (H), (J), (K), (L), and (M). |
| Section 110(a)(2) Infrastructure Requirements for the 2006 PM2.5 NAAQS | State-wide | 6/28/2010; 8/10/2011 | 7/14/2014 79 FR 40662 (pdf) (239 KB) | This action addresses the following CAA elements or portions thereof: 110(a)(2)(A), (B), (C), (D)(i)(II), (D)(ii), (E), (F), (G), (H), (J), (K), (L), and (M). |
| Section 110(a)(2) Infrastructure Requirements for the 2008 Ozone NAAQS | State-wide | 6/28/2010 | 7/14/2014 79 FR 40662 (pdf) (239 KB) | This action addresses the following CAA elements or portions thereof: 110(a)(2)(A), (B), (C), (D)(i)(II), (D)(ii), (E), (F), (G), (H), (J), (K), (L), and (M). |
| Section 110(a)(2) Infrastructure Requirements for the 2010 NO2 NAAQS | State-wide | 9/16/2013 | 8/11/2014 79 FR 46708 (pdf) (239 KB) | This action addresses the following CAA elements or portions thereof: 110(a)(2)(A), (B), (C), (D)(i)(II), (D)(ii), (E), (F), (G), (H), (J), (K), (L), and (M). |
| Section 110(a)(2) Infrastructure Requirements for the 2010 SO2 NAAQS | State-wide | 9/16/2013 | 8/11/2014 79 FR 46708 (pdf) (239 KB) | This action addresses the following CAA elements or portions thereof: 110(a)(2)(A), (B), (C), (D)(i)(II), (D)(ii), (E), (F), (G), (H), (J), (K), (L), and (M). |
| Interstate Transport Requirements for the 2006 24-hour PM2.5 NAAQS | State-wide | 6/28/2010 | 4/17/2015 80 FR 21181 (pdf) (240 KB) | This action addresses the following CAA elements: 110(a)(2)(D)(i)(I). |
| Interstate Transport Requirements for the 2008 Ozone NAAQS | State-wide | 6/28/2010 | 12/18/2015 80 FR 78981 (pdf) (220 KB) | This action addresses the following CAA elements: 110(a)(2)(D)(i)(I). |
| Interstate Transport Requirements for the 2010 NO2 NAAQS | State-wide | 12/24/2015 | 5/5/2016 81 FR 27017 (pdf) (239 KB) | This action addresses the following CAA elements: 110(a)(2)(D)(i)(I). |
| Section 110(a)(2) Infrastructure Requirements - 2012 PM2.5 NAAQS | State-wide | 12/23/2015 | 12/4/2017 82 FR 57132 (pdf) (245 KB) | Approves SIP for purposes of CAA sections 110(a)(2)(A), (B), (C), (D)(i)(II), (D)(ii), (E), (F), (G), (H), (J), (K), (L), (M) for the 2012 PM2.5 NAAQS. |
| Interstate Transport Requirements for the 2012 PM2.5 NAAQS | State-wide | 12/23/2015 | 9/24/2018 83 FR 48240 (pdf) (238 KB) | This action addresses CAA 110(a)(2)(D)(i)(I). |
| Section 110(a)(2) Infrastructure Requirements - 2015 ozone NAAQS | State-wide | 9/27/2018 | 9/16/2020 85 FR 57723 (pdf) (249 KB) | Approves SIP for purposes of CAA sections 110(a)(2)(A), (B), (C), (D)(i)(II), (D)(ii), (E), (F), (G), (H), (J), (K), (L), and (M) for the 2015 ozone NAAQS. |
| Interstate Transport Requirements - 2015 Ozone NAAQS | State-wide | 9/26/2018 | 10/16/2020 85 FR 65722 (pdf) (258 KB) | This action addresses CAA 110(a)(2)(D)(i)(I). |
| Interstate Transport Requirements for the 2010 Sulfur Dioxide NAAQS | State-wide | 12/24/2015 | 4/9/2021 86 FR 18458 (pdf) (252 KB) | This action addresses CAA 110(a)(2)(D)(i)(I). |
| Regional Haze SIP Revision | State-wide | 10/25/2010 | 6/22/2011 76 FR 36329 (pdf) (186 KB) | The portion of the Regional Haze SIP revision relating to BART, the calculation of baseline and natural conditions, and the statewide inventory of emissions of pollutants that are reasonably anticipated to cause or contribute to visibility impairment in any mandatory Class I Federal Area. |
| Regional Haze SIP Revision | State-wide | 10/25/2010 | 11/8/2012 77 FR 66929 (pdf) (255 KB) | The portion of the Regional Haze SIP relating to the reasonable progress goals, long term strategy, monitoring strategy, consultation with states and Federal Land Managers, periodic SIP revisions, and 5-year progress reports. |
| Regional Haze SIP Revision | State-wide | 6/29/2012 | 4/28/2014 79 FR 23273 (pdf) (254 KB) | The portion of the Regional Haze SIP relating to BART for the TASCO, Nampa facility. |
| Regional Haze 5-Year Progress Report | State-wide | 6/28/2016 | 7/15/2019 84 FR 33697 (pdf) (222 KB) | |
| Regional Haze SIP Revision for the Second Implementation Period | Sate-wide | 8/5/2022, supplemented 5/8/2024 | 9/5/2025 90 FR 42821 (pdf) (331 KB) | |