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CARB CTR Phase 3

February 24, 2026

Background

Assembly Bill (AB) 617 created the Criteria and Toxics Reporting (CTR) Regulation, California’s uniform statewide system for annual emis-sions reporting of criteria pollutants and toxic air contaminants (TACs). CTR became effective January 1, 2020, and has been phasing in by air district group and sector. CTR identifies which facilities must re-port based on greenhouse gas (GHG) reporting, criteria pollutant emissions, elevated toxics risk, or specific permitted processes. CTR requirements are submitted as part of each air district’s annual emis-sions reporting program.

New for DY2025

Beginning with data year (DY) 2025, Phase 3 of the California Air Resources Board’s (CARB’s) CTR Regulation applies to Additional Applicability Facilities in District Group A, which includes the South Coast Air Quality Management Dis-trict (SCAQMD), San Diego County Air Pollution Control District (SDAPCD), San Joaquin Valley Air Pollution Control District (SJVAPCD), Imperial County Air Pollution Control District (ICAPCD), Sacramento Metropoli-tan Air Quality Management District (SMAQMD), and Bay Area Air Dis-trict. Facilities with Phase 3 permit-ted processes that meet the activity thresholds listed in CTR Appendix A, Table A-3 must now report emissions or activity data, even if they have not reported to local air districts before. Examples of Phase 3 permitted processes now subject to reporting for District Group A include:

• Cremation of Humans or Ani-mals;
• Fiberglass Manufacturing;
• Semiconductor Manufacturing;
• Oil and Gas Extraction and Pro-duction;
• Metal Melting and Foundries;
• Long-Term Asbestos Removal; and
• Large Natural Gas or Propane Combustion [≥ 75 Million Standard Cubic Feet (MMSCF) or 77,000 Million British Ther-mal Units (MMBtu) per Year].

Permitted facilities are required to submit emissions inventory reports to document criteria air pollutants and TAC emissions to local air dis-tricts. For facilities in the SCAQMD, emissions reports are due May 1, 2026, for the previous year’s emis-sions. Due dates for other air dis-tricts may vary.

Coming in DY2026

Beginning with DY2026 and subse-quent years, District Group A facili-ties subject to Phases 1, 2, and 3 must report additional TACs listed in CTR Appendix B, Table B-3 . Facilities in Phases 1, 2, and 3 should prepare to quantify criteria pollutants and TACs for DY2026 reporting.

District Group B facilities are sub-ject to Phase 3 beginning with DY2027.

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Yorke Engineering has assisted over 2,000 industrial and government facilities across California with EH&S consulting and air quality consulting, as well as permitting and compliance for storm water, wastewater, hazardous waste, industrial hygiene, and safety programs. Learn more here: Services – Yorke Engineering, LLC

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