40 CFR 52.370 - Identification of plan.

Regulations last checked for updates: Feb 11, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026

View all text of Subpart H [§ 52.369 - § 52.388]

§ 52.370 - Identification of plan.

(a) Purpose and scope. This section sets forth the applicable State implementation plan for the State of Connecticut under section 110 of the CAA, 42 U.S.C. 7401-7671q,and.

(b) Incorporation by reference. (1) Material listed in paragraphs (c) and (d) of this section with an EPA approval date prior to August 25, 2025, was approved for incorporation by reference by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Material is incorporated as it exists on the date of the approval and notification of any change in the material will be published in the Federal Register. Entries in paragraphs (c) and (d) of this section with EPA approval dates after August 25, 2025, will be incorporated by reference in the next update to the SIP compilation.

(2) EPA Region 1 certifies that the rules/regulations provided by EPA in the SIP compilation at the addresses in paragraph (b)(3) of this section are an exact duplicate of the officially promulgated State rules/regulations which have been approved as part of the State implementation plan as of the dates referenced in paragraph (b)(1) of this section.

(3) Copies of the materials incorporated by reference may be inspected at the Region 1 EPA Office at 5 Post Office Square—Suite 100, Boston, MA 02109. To obtain the material, please call the EPA Region 1 Office. You may also inspect the material with an EPA approval date prior to August 25, 2025, at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].

EPA-Approved Connecticut Regulations and Statutes

State citation	Title/subject	State effective date	EPA approval date	Explanations
14-164c	Periodic Motor Vehicle Emissions Inspection and Maintenance	05/28/2004	12/05/2008, 73 FR 74019	DMV regulation revisions for test and repair network and implementing OBD2 and other tests.
22a-171	Duties of Commissioner of Environmental Protection	01/12/1993	05/19/1994, 59 FR 26123	Associated with the Small Business Stationary Source Technical and Environmental Compliance Assistance Program.
22a-174-1	Definitions	11/13/2023	02/12/2024, 89 FR 9771	Modified definition of “severe non-attainment area for ozone.”
				Note: Definitions which have been Incorporated By Reference into the Connecticut State Implementation Plan are numbered consecutively above by EPA, and do not necessarily correspond to the State's assigned definition number in the Connecticut State Regulation. It is Connecticut's practice to renumber their definitions in Section 22a-174-1 when definitions are added or deleted from the State Regulation.
22a-174-2a	Procedural Requirements for New Source Review and Title V Permitting	11/18/2020	09/05/2023, 88 FR 60591	Revisions made to 22a-174-2a(c)(3), 22a-174-2a(d)(9), 22a-174-2a(e)(3)(C), 22a-174-2a(e)(3)(E), 22a-174-2a(e)(7), 22a-174-2a(f)(2), and 22a-174-2a(f)(2)(G).
22a-174-3a	Permit to Construct and Operate Stationary Sources	11/18/2020	09/05/2023, 88 FR 60591	Revisions made to 22a-174-3a(a)(2)(A)(ii) through (v), 22a-174-3a(a)(5), 22a-174-3a(d)(3)(B) and (C), 22a-174-3a(i) Table 3a(i)-1, 22a-174-3a(i)(2), 22a- 174-3a(j)(1)(B), 22a-174-3a(j)(8)(A), 22a-174-3a(k)(3) and (4), 22a-174- 3a(k)(6)(A), 22a-174-3a(k)(7) Table 3a(k)-1, and 22a-174-3a(l)(1).
22a-174-3b	Permits for Construction and Operation of Stationary Sources	04/04/2006	08/31/2006, 71 FR 51761	Only the automotive refinishing requirements of 22a-174-3b are being approved. Connecticut did not submit the other subsections of the rule as part of its SIP revision.
22a-174-4a	Source monitoring, record keeping and reporting	10/28/2022	07/08/2024, 89 FR 55888	Replaces 22a-174-4.
22a-174-5	Methods for Sampling, Emission Testing, and Reporting	12/19/1980 04/15/2014	08/28/1981, 46 FR 43418 05/25/2016, 81 FR 33134
19-508-6	Air Pollution Emergency Episode Procedures	08/31/1979	12/23/1980, 45 FR 84769
22a-174-7	Air Pollution Control Equipment and Monitoring Equipment Operation	04/01/2004	07/16/2014, 79 FR 41427
19-508-8, 22a-174-8	Compliance Plan and Schedules	12/22/2016	07/31/2017, 82 FR 35454	Minor edit to update citation.
19-508-9	Prohibition of Air Pollution	08/31/1979	08/12/1983, 48 FR 36579
19-508-10	Public Availability of Information	04/04/1972	10/28/1972, 37 FR 23085
19-508-11	Prohibition Against Concealment or Circumvention	04/04/1972	10/28/1972, 37 FR 23085
19-508-12	Violations and Enforcement	04/04/1972	10/28/1972, 37 FR 23085
19-508-13	Variances	08/31/1979	12/23/1980, 45 FR 84769
19-508-14	Compliance with Regulation No Defense to Nuisance Claim	04/04/1972	05/31/1972, 37 FR 10842
19-508-15	Severability	04/04/1972	05/31/1972, 37 FR 10842
19-508-16	Responsibility to Comply with Applicable Regulations	04/04/1972	05/31/1972, 37 FR 10842
19-508-18	Control of Particulate Emissions	07/11/1981	09/23/1982, 47 FR 41958
22a-174-18	Control of Particulate Matter and Visible Emissions	04/01/2004	07/16/2014, 79 FR 41427	All of Section 22a-174-18 is approved, with the exception of the phrase “or malfunction” in Section 22a-174-18(j)(1) and all of Section 22a-174-18(j)(2), which CT DEEP withdrew from the SIP submittal. Because Connecticut withdrew Section 22a-174-18(j)(2) from its SIP submission, stationary sources subject to a Federal NSPS will remain subject to the opacity limits contained in “Control of Particulate Emissions” under the SIP (See 37 FR 10842). See Section 19-508-18, “Control of Particulate Emissions” posted at www.epa.gov/sips-ct/epa-approved-regulations-connecticut-sip.
		12/22/2016	07/31/2017, 82 FR 35454	Minor edit to update citation.
		08/03/2018	10/29/2020, 85 FR 68472	Approval of revisions to subsections (c), (f), and (j).
22a-174-19	Control of Sulfur Compound Emissions	11/02/1981 04/15/2014	11/18/1981, 46 FR 56612 05/25/2016, 81 FR 33134
22a-174-19a	Control of sulfur dioxide emissions from power plants and other large stationary sources of air pollution	12/28/2000	07/10/2014, 79 FR 39322	Approves the sulfur dioxide emission standards and fuel sulfur limits for units subject to the CT NOX Budget program. The following sections were not submitted as part of the SIP: Sections (a)(5); (a)(8); (a)(11); (d); (e)(4); (f); (g); (h); and in (i)(2) reference to (e)(4).
		04/15/2014	05/25/2016, 81 FR 33134	Revises sections 22a-174-19a(e) and 22a-174-19a(i) and removes outdated section 22a-174-19a(c).
22a-174-19b	Fuel Sulfur Content Limitations for Stationary Sources	04/15/2014	05/25/2016, 81 FR 33134	A new regulation which limits the sulfur content of liquid fuels used in stationary sources. Subsection (e) was not submitted by the State.
22a-174-20	Control of Organic Compound Emissions	10/28/2022	07/08/2024, 89 FR 55888	Amends 22a-174-20(a)(12).
19-508-21	Control of Carbon Monoxide Emissions	04/04/1972	10/28/1972, 37 FR 23085
22a-174-22	Control of Nitrogen Oxides Emissions	01/23/1997 12/28/2000	10/06/1997, 62 FR 52016 07/10/2014, 79 FR 39322	Amended by adding section (e)(3), which approves the Oct-April NOX emission limits for units subject to the CT NOX Budget program.
22a-174-22a	Nitrogen Oxides (NOX) Budget Program	03/03/1999	09/28/1999, 64 FR 52233
		09/04/2007	01/24/2008, 73 FR 4105	Repealed as of January 24, 2008. Superseded by CAIR (22a-174-22c).
22a-174-22b	Post-2002 Nitrogen Oxides (NOX) Budget Program	09/29/1999	12/27/2000, 65 FR 81743
		09/04/2007	01/24/2008, 73 FR 4105	Repealed as of May 1, 2010. Superseded by CAIR (22a-174-22c).
22a-174-22c	The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (NOX) Ozone Season Trading Program	12/22/2016	07/31/2017, 82 FR 35454	Minor edit to update citation.
22a-174-22e	Control of nitrogen oxides emissions from fuel-burning equipment at major stationary sources of nitrogen oxides	10/28/2022	07/08/2024, 89 FR 55888	Amends 22a-174-22e(m)(1) and (m)(4).
22a-174-22f	High daily NOX emitting units at non-major sources of NOX	12/22/2016	07/31/2017, 82 FR 35454	New regulation applicable to non-major sources of NOX.
19-508-24	Connecticut Primary and Secondary Standards	10/08/1980	12/13/1985, 50 FR 50906
22a-174-24	Connecticut Primary and Secondary Ambient Air Quality Standards	04/15/2014	06/24/2015, 80 FR 36242	EPA did not approve subsections (a), (c), (g), or (j) into the Connecticut State Implementation Plan (SIP). Subsection (m) Dioxin, which Connecticut withdrew from its SIP submittal was also not approved.
19-508-25	Effective Date	04/04/1972	10/28/1972, 37 FR 23085
22a-174-27	Emission Standards and On-Board Diagnostic II Test Requirements for Periodic Motor Vehicle Inspection and Maintenance	08/10/2009	3/17/2015, 80 FR 13768	This SIP revision includes a change to exempt composite vehicles from tailpipe inspections. Revision to Section 22a-174-27 (b) and removal of Section 22a-174-27 (e).
22a-174-28	Oxygenated Gasoline	04/15/2014	06/24/2015, 80 FR 36242	Amendment of subdivision (a)(5) Control period.
22a-174-30a	Stage I Vapor Recovery	07/08/2015	12/15/2017, 82 FR 59519	Replaces the repealed section 22a-174-30.
22a-174-32	Reasonably Available Control Technology for Volatile Organic Compounds	07/08/2015	12/15/2017, 82 FR 59519	Revises section (b)(3).
22a-174-33a	Limit on Premises-wide Actual Emissions Below 50% of Title V Thresholds	09/24/2020	03/11/2022, 87 FR 13936
22a-174-33b	Limit on Premises-wide Actual Emissions Below 80% of Title V Thresholds	09/24/2020	03/11/2022, 87 FR 13936	Approved with the exception of section (d)(6) which Connecticut withdrew from its SIP submittal.
22a-174-36	Low Emission Vehicles	01/29/1999	08/16/1999, 64 FR 44411	Section 22a-174-36(a) through 36(f) state effective 12/23/1994; Section 22a-174-36(g) state effective 01/29/1999.
22a-174-36b	Low Emission Vehicles II Program	08/01/2013	07/15/2024, 89 FR 57361	Revises LEV II program, places end date on model year vehicles.
22a-174-36c (pdf) (141 KB)	Low Emission Vehicles III program	08/01/2013	07/15/2024, 89 FR 57361	Adopts the LEV III regulation.
22a-174-38	Municipal Waste Combustors	08/02/2016	07/31/2017, 82 FR 35454	Portions of previously approved regulation were revised, primarily to incorporate tightened NOX emission limit for mass burn water-walled units.
22a-174-40	Consumer Products	10/05/2017	11/19/2018, 83 FR 58188	Minor correction published 12/04/2018 (83 FR 62466), clarifying that the effective date of the final rule is December 19, 2018.
22a-174-41	Architectural and Industrial Maintenance Products—phase 1	10/05/2017	11/19/2018, 83 FR 58188	Minor correction published 12/04/2018 (83 FR 62466), clarifying that the effective date of the final rule is December 19, 2018.
22a-174-41a	Architectural and Industrial Maintenance Products—phase 2	10/05/2017	11/19/2018, 83 FR 58188	Minor correction published 12/04/2018 (83 FR 62466) clarifying that the effective date of the final rule is December 19, 2018.
22a-174-44	Adhesives and Sealants	10/03/2008	06/09/2014, 79 FR 32873
Connecticut General Statute. Title 1, Chapter 10, Section 1-85	Interest in conflict with discharge of duties	10/01/1989	06/03/2016, 81 FR 35636	Approves criteria for identifying a conflict of interest.
Connecticut General Statute. Title 16a, Chapter 296, Section 16a-21a	Sulfur content of home heating oil and off-road diesel fuel. Suspension of requirements for emergency. Enforcement	07/01/2015	08/01/2018, 83 FR 37437	Allowable sulfur content of fuels provided. Criteria for suspension of requirements and for enforcement identified.
Connecticut General Statute. Title 22a, Chapter 446c, Section 22a-171	Duties of Commissioner of Energy and Environmental Protection	10/01/1984	06/03/2016, 81 FR 35636	Identifies obligations and activities of the Commissioner.
Connecticut General Statute. Title 22a, Chapter 446c, Section 22a-174(f)	Open Burning	03/30/2000	09/01/2016, 81 FR 60274	Approves criteria for open burning and process for certifying local open-burning officials.
Connecticut Public Act No. 13-120	An act concerning gasoline vapor recovery systems	06/18/2013	12/15/2017, 82 FR 59519	Revises section 22a-174e of the Connecticut General Statutes to require decommissioning of Stage II Vapor Recovery Systems.

(d) EPA-approved State source-specific requirements.

EPA-Approved Connecticut Source-Specific Requirements

Name of source	Permit No.	State effective date	EPA approval date	Explanations
Sikorsky Aircraft Division of United Technologies Corp	Letter dated May 19, 1982	3/9/1982	11/12/1982, 47 FR 51129	Includes Order No. 7003A.
Lydall & Foulds Division of Lydall, Inc	Letter dated January 5, 1983	10/13/1982	5/4/1983, 48 FR 20051	Allows variance per Sulfur Energy Trade Program.
Simkins Industries	Letter dated July 19, 1983	12/14/1982	6/28/1983, 48 FR 29689	Allows variance per Sulfur Energy Trade Program.
Loomis Institute	Letter dated July 13, 1983	5/24/1983	12/20/1983, 48 FR 56218	Allows variance per Sulfur Energy Trade Program.
Connecticut Charcoal Company	Order No. 943	5/28/1986	11/20/1986, 51 FR 41963
King Industries	Order No. 944	4/23/1986	2/19/1987, 52 FR 5104
Belding Corticelli Thread Company	Order No. 8007	8/8/1987	12/17/1987, 52 FR 47925
Raymark Industries, Inc	Order No. 8013	9/24/1987	4/11/1988, 53 FR 11847	Includes Compliance Timetable.
American Cyanamid Company	Order No. 8012	1/6/1988	8/1/1988, 53 FR 28884	Includes Compliance Timetable.
Spongex International, Ltd	Order No. 8008	8/21/1987	7/12/1988, 53 FR 26256	Includes Compliance Timetable.
General Motors Corporation	Order No. 8023	7/8/1988	3/24/1989, 54 FR 12193	Includes Compliance Timetable.
Frismar, Inc	Order No. 8001	10/20/1987	11/28/1989, 54 FR 48885	Includes Compliance Timetable.
Stanadyne, Inc	Order No. 8018	1/3/1989	4/10/1989, 54 FR 14226	Includes Compliance Timetable.
Hamilton Standard Division of United Technologies Corp	Order No. 8029	11/29/1989	3/12/1990, 55 FR 9121	Includes Compliance Timetable.
Stone Connecticut Paperboard Corporation	Order No. 1073B	2/25/1992	11/20/1992, 57 FR 54703
Hartford Hospital	Order No. 7016A	2/5/1992	11/20/1992, 57 FR 54703	Includes Compliance Timetable.
Connecticut Light and Power Company	Order No. 7017	2/25/1991	3/24/1992, 57 FR 10139	Includes Compliance Timetable.
United Technologies Corporation	Order No. 7019	2/19/1993	1/18/1994, 59 FR 2530
City of New Haven	Order No. 8073	9/24/1993	9/11/1995, 60 FR 47076
Waterfront Enterprises, Inc	Order No. 8074	11/5/1993	9/11/1995, 60 FR 47076
Laydon Construction	Order No. 8075	9/21/1993	9/11/1995, 60 FR 47076
United Illuminating Company	Order No. 8076	12/2/1993	9/11/1995, 60 FR 47076
M.J. Metals, Inc	Order No. 8076c	6/18/1993	9/11/1995, 60 FR 47076
New Haven Terminal, Inc	Order No. 8078	11/15/1993	9/11/1995, 60 FR 47076
Yankee Gas Services Company	Order No. 8079	9/24/1993	9/11/1995, 60 FR 47076
United Illuminating Company	Trading Agreement and Order No. 8092	5/18/1995	10/6/1997, 62 FR 52016
American Ref-Fuel Company of Southeastern Connecticut	Trading Agreement and Order No. 8095	6/2/1995	10/6/1997, 62 FR 52016
Pfizer, Inc	Trading Agreement and Order No. 8093	7/19/1995	10/6/1997, 62 FR 52016
Connecticut Light and Power Company	Trading Agreement and Order No. 8096	10/10/1995	10/6/1997, 62 FR 52016
Northeast Nuclear Energy Company	Trading Agreement and Order No. 8106	10/13/1995	10/6/1997, 62 FR 52016
Northeast Nuclear Energy Company	Trading Agreement and Order No. 8107	10/13/1995	10/6/1997, 62 FR 52016
General Dynamics Corporation, Electric Boat Division	Trading Agreement and Order No. 8105	10/31/1995	10/6/1997, 62 FR 52016
Bridgeport Resco Company, Limited Partnership	Trading Agreement and Order No. 8100	11/2/1995	10/6/1997, 62 FR 52016
United Illuminating Company	Trading Agreement and Order No. 8102	12/15/1995	10/6/1997, 62 FR 52016
United Illuminating Company	Trading Agreement and Order No. 8103	2/14/1996	10/6/1997, 62 FR 52016
City of Norwich Department of Public Utilities	Trading Agreement and Order No. 8119	3/4/1996	10/6/1997, 62 FR 52016
South Norwalk Electric Works	Trading Agreement and Order No. 8118	3/19/1996	10/6/1997, 62 FR 52016
State of Connecticut Department of Mental Health and Addiction Services	Trading Agreement and Order No. 8101	7/16/1996	10/6/1997, 62 FR 52016
Yale University	Trading Agreement and Order No. 8110	7/29/1996	10/6/1997, 62 FR 52016
Bridgeport Hospital	Trading Agreement and Order No. 8132	9/10/1996	10/6/1997, 62 FR 52016
Connecticut Light and Power Company	Order No. 1494	10/15/1996	10/6/1997, 62 FR 52016
State of Connecticut Department of Public Works	Trading Agreement and Order No. 8130	10/18/1996	10/6/1997, 62 FR 52016
University of Connecticut	Trading Agreement and Order No. 8115	11/19/1996	10/6/1997, 62 FR 52016
Simkins Industries	Trading Agreement and Order No. 8113	11/19/1996	10/6/1997, 62 FR 52016
Bridgeport Hydraulic Company	Trading Agreement and Order No. 8135	12/24/1996	10/6/1997, 62 FR 52016
Town of Wallingford Department of Public Utilities	Trading Agreement and Order No. 8141	12/27/1996	10/6/1997, 62 FR 52016
Algonquin Gas Transmission Company	Trading Agreement and Order No. 8123	4/18/1997	10/6/1997, 62 FR 52016
Connecticut Resources Recovery Authority	Trading Agreement and Order No. 8116	4/221997	10/6/1997, 62 FR 52016
Risdon Corporation	Order No. 8036	5/6/1996	4/24/1998, 63 FR 20315
AlliedSignal, Inc. and U.S. Army Tank-Automotive and Armaments Command	Trading Agreement and Order No. 8137	11/19/1996	9/28/1999, 64 FR 52233
Connecticut Natural Gas Corporation	Trading Agreement and Order No. 8138	11/19/1996	9/28/1999, 64 FR 52233
Cytec Industries, Inc	Trading Agreement and Order No. 8114	12/20/1996	9/28/1999, 64 FR 52233
CTG Resources, Inc. (Formerly The Connecticut Natural Gas Company)	Trading Agreement and Order No. 8138 Modification	6/25/1997	9/28/1999, 64 FR 52233
AlliedSignal, Inc. and U.S. Army Tank-Automotive and Armaments Command	Trading Agreement and Order No. 8137 Modification	7/8/1997	9/28/1999, 64 FR 52233
Ogden Martin Systems of Bristol, Inc	Trading Agreement and Order No. 8094	7/23/1997	9/28/1999, 64 FR 52233
Wisvest-Connecticut, LLC	Trading Agreement and Order No. 8177	5/31/2000	3/23/2001, 66 FR 16135
Wisvest-Connecticut, LLC	Trading Agreement and Order No. 8187	1/12/2000	3/23/2001, 66 FR 16135
Ogden Martin Systems of Bristol, Inc	Trading Agreement and Order No. 8094 Modification 2	5/22/2000	3/23/2001, 66 FR 16135
American Ref-Fuel Company of Southeastern Connecticut	Trading Agreement and Order No. 8095 Modification 2	5/22/2000	3/23/2001, 66 FR 16135
Bridgeport Resco Company, Limited Partnership	Trading Agreement and Order No. 8100 Modification 2	5/22/2000	3/23/2001, 66 FR 16135
Connecticut Resources Recovery Authority	Trading Agreement and Order No. 8116 Modification 2	5/22/2000	3/23/2001, 66 FR 16135
Wisvest-Connecticut, LLC	Trading Agreement and Order No. 8178	5/22/2000	3/23/2001, 66 FR 16135
Wisvest-Connecticut, LLC	Trading Agreement and Order No. 8179	5/22/2000	3/23/2001, 66 FR 16135
Wisvest-Connecticut, LLC	Trading Agreement and Order No. 8176	5/31/2000	3/23/2001, 66 FR 16135
Hitchcock Chair Company, Ltd	Order No. 8229A	4/15/2002	10/24/2005, 70 FR 61384
Kimberly-Clark Corporation	Order No. 8190	4/23/2002	10/24/2005, 70 FR 61384
Ross & Roberts, Inc	Order No. 8237	10/4/2002	10/24/2005, 70 FR 61384
Sumitomo Bakelite North America, Inc	Order No. 8245	10/11/2006	6/27/2013, 78 FR 38587
Cyro Industries	Order No. 8268	2/28/2007	6/27/2013, 78 FR 38587
Curtis Packaging Corporation	Order No. 8270	5/1/2007	6/27/2013, 78 FR 38587
PSEG Power Connecticut LLC (formerly Wisvest Connecticut LLC)	Trading Agreement and Order No. 8187 Modification 1	7/16/2012	8/3/2015, 80 FR 45887
PSEG Power Connecticut LLC	Trading Agreement and Order No. 8242 Modification 1	7/16/2012	8/3/2015, 80 FR 45887
Mallace Industries Corporation	Order No. 8258	9/13/2005	5/1/2017, 82 FR 20262
Hamilton Sundstrand	Order No. 8029A	9/3/2009	5/1/2017, 82 FR 20262
Middletown Power LLC, Montville Power LLC, Connecticut Jet Power LLC, and Devon Power LLC	Consent Order No. 8377, Modification 1	5/3/2022	6/28/2022, 87 FR 38284	General Bridge Acquisition LLC purchased the collective sources referred to as “NRG Connecticut” in past references for Consent Order 8377.
Thames Shipyard & Repair Company	Consent Order No. 8381	12/3/2021	7/24/2025, 90 FR 34768	EPA action also removed from the SIP: Dow Chemical U.S.A. Order # 7002B and Pratt & Whitney Order # 8027.

(e) Nonregulatory.

Connecticut Non Regulatory

Name of non-regulatory SIP provision	State submittal date/ effective date	EPA approved date	Explanations
Miscellaneous non-regulatory addition to the plan and addition of amendment to Chapter 360 of General Statutes which provides authority for delegation of enforcement authority submitted on March 21, 1972, by the Connecticut Department of Environmental Protection	3/21/1972	5/31/1972, 37 FR 10842
Miscellaneous non-regulatory additions to the plan submitted on April 6, 1972, by the Connecticut Department of Environmental Protection	4/6/1972	5/31/1972, 37 FR 10842
Attainment dates submitted on August 10, 1972 by CT DEP	8/10/1972	5/14/1973, 38 FR 12696
Non-regulatory additions to the plan which were submitted on December 19, 1980, and amended on March 11, 1981, by CT DEP	12/19/1980 and 3/11/1981	8/28/1981, 46 FR 43418	Amending the sulfur control strategy to include an “Air Pollution Control/Energy Trade Option” except for submittal attachments #1 and #2, “Sulfur Dioxide” and “Transport of Sulfur Dioxide” and the section of attachment #3 “Control of Sulfur Oxides” entitled “Sample Analysis of a Btu Bubble Application”.
Non-regulatory addition to the plan of the state New Source Ambient Impact Analysis Guideline	12/19/1980; 3/11/1981; and 7/15/1981	8/28/1981, 46 FR 43418	For use in state program actions, submitted on December 19, 1980 and amended on March 11, 1981 and July 15, 1981.
Source Test Guidelines and Procedures; and Workshop Manual for Gasoline Tank Truck Certification		7/18/1985, 50 FR 29229	Includes Appendix B of Control of Volatile Organic Compound Leaks from Gasoline Tank Trucks and Vapor Collection Systems EPA-450/2-78-051.
Letter dated May 16, 1985 certifying the meaning of an “Acceptable Method”	5/16/1985	12/13/1985, 50 FR 50906	Interpreted to mean that any monitoring method used to collect ambient air pollution data used for attainment status evaluation or designation must be approved by EPA.
Technical Support Document prepared by CT DEP		4/11/1988, 53 FR 11847	Provides complete description of the reasonably available control technology determination imposed on Raymark Industries.
Letter from CT DEP dated July 3, 1986	7/3/1986	5/19/1988, 53 FR 17934	Commits CT DEP to use only EPA approved test methods when requiring the testing of sources emitting volatile organic compound emissions.
Letter from CT DEP dated May 29, 1987	5/29/1987	5/19/1988	Certifies that there are no polypropylene or high-density polyethylene manufacturers in the State of Connecticut.
Technical Support Document prepared by CT DEP		7/12/1988, 53 FR 26256	Provides complete description of the reasonably available control technology determination imposed on Spongex International, Ltd.
Technical Support Document prepared by CT DEP		8/1/1988, 53 FR 28884	Provides complete description of the reasonably available control technology determination imposed on American Cyanamid Co.
Technical Support Document prepared by CT DEP		3/24/1989, 54 FR 12193	Provides complete description of the reasonably available control technology determination imposed on New Departure Hyatt.
Technical Support Document prepared by CT DEP		4/10/1989, 54 FR 14226	Provides complete description of the reasonably available control technology determination imposed on Stanadyne, Inc.
Technical Support Document prepared by CT DEP		5/30/1989, 54 FR 22891	Provides complete description of the reasonably available control technology determination imposed on Pratt and Whitney's East Hartford facility.
Technical Support Document prepared by CT DEP		11/28/1989, 54 FR 48885	Provides complete description of the reasonably available control technology determination imposed on Frismar, Inc.
Technical Support Document prepared by CT DEP		3/12/1990, 55 FR 9121	Provides complete description of the reasonably available control technology determination imposed on Hamilton Standard.
Memorandum dated September 14, 1990 approving modeling analysis for Connecticut Light and Power	9/14/1990	3/24/1992, 57 FR 10139
Letter dated April 3, 1991 confirming that the revised configuration approved by State Order No. 7017 will not lead to violations	4/3/1991	3/24/1992, 57 FR 10139
Modeling Study dated January 26, 1990 for Connecticut Light and Power	1/28/1990	3/24/1992, 57 FR 10139
Memorandum dated August 17, 1989 approving modeling analysis for Stone Container Co	8/17/1989	11/20/1992, 57 FR 54703
Modeling Study dated August 9, 1989 for Stone Container Co	8/9/1989	11/20/1992, 57 FR 54703
State Order No 1073A, effective July 9, 1990	7/9/1990	11/20/1992, 57 FR 54703
Memorandum dated January 3, 1990 approving modeling analysis for Hartford Hospital	1/3/1990	11/20/1992, 57 FR 54703
Modeling Study dated December 28, 1989 for Hartford Hospital	12/28/1989	11/20/1992, 57 FR 54703
SIP narrative entitled “New Source Review”		2/23/1993, 56 FR 10957
Letter from CT DEP regarding implementation of BACT		2/23/1993, 56 FR 10957
Narrative of SIP Revision: Stage II Vapor Recovery	January 1993	12/17/1993, 58 FR 65930
Air Quality Modeling Analysis to Demonstrate SO2 CAAQS/NAAQS Compliance	June 1991	1/18/1994, 59 FR 2530	Relates to Hamilton Standard Division of United Technologies Corporation.
Letter from CT DEP dated April 6, 1994 clarifying the January 12, 1993 submittal	4/6/1994	5/19/1994, 59 FR 26123
An attainment plan and demonstration which outlines Connecticut's control strategy and for attainment and maintenance of the PM10 NAAQS		9/11/1995, 60 FR 47076	Implements and meets RACM and RACT requirements, and provides contingency measures for New Haven.
Letter dated June 18, 1996 from CT DEP and SIP narratives for various Source Orders	6/18/1996	10/6/1997, 62 FR 52016	SIP narratives for Order Nos. 8092, 8095, 8093, 8096, 8106, 8107, 8105, 8100, and others.
Letter from CT DEP dated June 27, 1994 clarifying language in sec 22a-174-32(A)	6/27/1994	3/10/1999, 64 FR 12019
Letters from CT DEP dated June 24, 1998 and November 13, 1998 submitting CT SIP revisions	6/24/1998 and 11/13/1998	3/10/1999, 64 FR 12005
Nonregulatory portions of submittals and Policy materials concerning the use of emission credits from New Jersey at Connecticut sources	7/11/1997, 9/12/1997, and 12/8/1997	9/28/1999, 64 FR 52233
Letter from CT DEP dated October 7, 1999 submitting a revision to the CT SIP	10/7/1999	12/1/1999, 64 FR 67188
Letter from CT DEP dated February 7, 1996 submitting a revision to the CT SIP for the Low Emission Vehicle Program	2/7/1996	3/9/2000, 65 FR 12476
Letter from CT DEP dated February 18, 1999 submitting a revision to the CT SIP	2/7/1996	3/9/2000, 65 FR 12476	Request for the National Low Emission Vehicle program to be a compliance option under the State's Low Emission Vehicle Program.
Letters from CT DEP dated April 15, 1997, April 20, 1998, and September 2, 1999 submitting revisions to the CT SIP	4/15/1997, 4/20/1998, and 9/2/199	10/19/2000, 65 FR 62620
Letter from CT DEP dated November 19, 1999 submitting a revision to the CT SIP	11/19/1999	10/27/2000, 65 FR 64357
Narrative portion of the SIP revision for Enhanced Motor Vehicle Inspection and Maintenance Program	10/7/1999	10/27/2000, 65 FR 64357
Letter from CT DEP dated September 30, 1999 submitting a revision to the CT SIP	9/30/1999	12/27/2000, 65 FR 81743	Contains RCSA section 22a-174-22b and associated administrative materials.
SIP Narrative dated September 30, 1999 for CT SIP revision	9/30/1999	12/27/2000, 65 FR 81743	SIP revision to implement the NOX SIP Call.
Letter from CT DEP dated May 19, 2000 submitting a revision to the CT SIP	5/19/2000	3/23/2001, 66 FR 16135
SIP narrative materials	December 1999	3/23/2001, 66 FR 16135	Submitted with Source Order Nos. 8176, 8177, 8178, 8179, and 8187.
Letter from CT DEP dated October 15, 2001 submitting a revision to the CT SIP	10/15/2001	12/6/2001, 66 FR 63311
Letter from CT DEP dated June 14, 2002 submitting a revision to the CT SIP	6/14/2002	2/27/2003, 68 FR 9009
Pressure Vacuum Vent Cap Test Procedures		8/31/2006, 71 FR 51765
Table 1 showing the emission reductions resulting form the measures Connecticut adopted to meet the shortfall identified in the Connecticut on-hour ozone attainment demonstration		8/31/2006, 71 FR 51765
Connecticut Regional Haze SIP Revision	Nov. 2009	7/10/14, 79 FR 39322
Letter from CT DEEP dated March 12, 2012	3/12/2012	7/10/14, 79 FR 39322	Clarification of Connecticut's 2008 PM2.5 Attainment Demonstration.
Letter from CT DEEP dated February 24, 2012 regarding Regional Haze SIP	2/24/2012	7/10/14, 79 FR 39322
Letter from CT DEEP dated November 23, 2012	11/23/2012	7/10/14, 79 FR 39322	Withdrawal of Request for Parallel Processing.
Letter from CT DEEP dated January 14, 2013, entitled “Information to Support EPA's Approval of Connecticut's Requirements for Opacity”	1/14/2013	7/16/14, 79 FR 41436
Letter from CT DEEP dated July 8, 2013	7/8/2013	7/16/14, 79 FR 41436	Withdrawing from CT DEEP's December 1, 2004 SIP revision the phrase “and malfunction” from Subsection (j)(1) of RCSA Section 22a-174-18.
Letter from CT DEEP dated March 27, 2014	3/27/2014	7/16/14, 79 FR 41436	Withdrawing from CT DEEP's December 1, 2004 SIP revision section 22a-174-18(j)(2).
Adequacy Determination of the Connecticut SIP with Regard to CAA Section 110(a)(1) and (2) for the 8-Hr Ozone NAAQS Program Infrastructure	12/28/2007	6/3/16, 81 FR 35639
Adequacy Determination of the Connecticut SIP with Regard to CAA Section 110(a) Infrastructure Elements: 1997 PM2.5 NAAQS	9/4/2008	6/3/16, 81 FR 35639
Adequacy Determination of the Connecticut SIP with Regard to CAA Section 110(a)(1) and (2) for 2006 PM2.5 NAAQS	9/18/2009	6/3/16, 81 FR 35639
CT DEEP document dated January 7, 2011	1/7/2011	6/3/16, 81 FR 35639	Request to withdraw a portion of Connecticut's PM2.5 Infrastructure Adequacy Determination.
Addendum to the CAA section 110(a)(2)(D)(i)(I) Portion of Connecticut's Infrastructure Submittal for the 2006 PM2.5 NAAQS	8/19/2011	6/3/16, 81 FR 35639
Adequacy Determination of the CT SIP with Regard to CAA section 110(a)(1) and (2) for the 2008 Lead NAAQS	10/13/2011	6/3/16, 81 FR 35639
Update to Connecticut PM2.5 Infrastructure submittal	6/15/2012	6/3/16, 81 FR 35639
CT SIP with Regard to the Infrastructure Requirements of CAA section 110(a)(1) and (2) for the 2008 Ozone NAAQS	12/28/2012	6/3/16, 81 FR 35639
CT SIP with Regard to the Infrastructure Requirements of CAA section 110(a)(1) and (2) for the 2010 Nitrogen Dioxide NAAQS	1/2/2013	6/3/16, 81 FR 35639
Connecticut SIP for CAA Section 110(a) Infrastructure Elements: 2010 Sulfur Dioxide NAAQS	5/30/2013	6/3/16, 81 FR 35639
Supplement to Infrastructure SIP Revisions	8/5/2015	6/3/16, 81 FR 35639
Letter from CT DEEP dated September 14, 2015, submitting a revision to the SIP	9/14/2015	12/15/17, 82 FR 59519
Addendum to the CAA § 110(a)(2)(D)(i)(I) Portion of Connecticut's Infrastructure Submittal for the 2006 PM2.5 NAAQS	8/19/2011	8/1/18, 83 FR 37437
Infrastructure SIP for the 2012 PM2.5 NAAQS	12/14/2015	8/1/18, 83 FR 37437
Letter from CT DEEP dated October 18, 2017, submitting a revision to the SIP	10/18/2017	8/1/18, 83 FR 37437	SIP revision concerning Consumer Products, Architectural and Industrial Maintenance Coatings and Prevention of Significant Deterioration Permit Programs.
Regional Haze 5-Yr Progress Report	7/8/2015	11/26/19, 84 FR 65007
Good Neighbor SIP for the 2008 Ozone NAAQS	6/11/2015	2/14/20, 85 FR 8406
Infrastructure SIP submittal for 2015 Ozone NAAQS	9/7/2018	8/19/20, 85 FR 50953
Good Neighbor SIP for the 2015 Ozone NAAQS	12/6/2018	12/20/21, 86 FR 71830
Letter from CT DEEP dated October 26, 2020, submitting a revision to the SIP	10/26/2020	3/11/22, 87 FR 13936	Letter from CT DEEP dated January 12, 2022 withdrawing regulation section 22a-174-33b(d)(6) from the SIP revision.
Letters from CT DEEP dated December 15, 2020 and February 14, 2023, submitting a revision to the SIP	12/15/2020	9/5/23, 88 FR 60591	SIP revision concerning the New Source Review Permit Program Update.
Letter from CT DEEP dated November 30, 2023, submitting a revision to the SIP	11/30/2023	2/12/24, 89 FR 9771	SIP revision concerning the Definition of Severe non-Attainment Area for Ozone.
Regional Haze plan for Second Implementation Period (2018-2028)	1/5/2022	9/17/24, 89 FR 75973
Second 10-year Limited Maintenance Plan for Connecticut's PM2.5 Maintenance Area	5/9/2023	11/15/2024, 89 FR 90230
Attainment Plan SIP elements for Connecticut's Serious Nonattainment area under the 2008 Ozone NAAQS	6/23/2022	4/1/2025, 90 FR 14341	Pertains to requirements for Reasonable Further Progress (RFP), enhanced motor vehicle inspection and maintenance (I/M) program, motor vehicle emission budgets for transportation conformity, and a clean fuels for motor vehicles program.
Letter from CT DEEP dated May 22, 2023, submitting a revision to the SIP	5/22/2023	4/22/25, 90 FR 16814	SIP revision concerning New Source Review certification for the Greater CT Moderate Nonattainment area under the 2015 Ozone NAAQS and an Emission Statement certification for both the Greater CT and the Southwest CT Moderate Nonattainment areas under the 2015 Ozone NAAQS.
Letter from CT DEEP dated May 3, 2024, submitting a revision to the SIP	5/3/2024	7/16/25, 90 FR 31881	SIP revision concerning a 2017 Base Year Emissions Inventory for the 2015 Ozone NAAQS. Submittal also includes 2014 and 2017 Periodic Emission Inventories for the 2008 Ozone NAAQS, approved under separate action.

[91 FR 5678, Feb. 9, 2026]

authority: 42 U.S.C. 7401

cite as: 40 CFR 52.370