EPA-Approved California Test Procedures, Test Methods, and Specifications

EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 Tribal Nations.

This page contains approved California test procedures, test methods and specifications that are cited in certain regulations listed in EPA-Approved Statutes and State Regulations in the California SIP. EPA's Pacific Southwest Office maintains these tables and will update them to reflect any changes in the official tables codified in the Code of Federal Regulations. To find the status of SIP submittals, visit SIP Status Reports.

Related Content: EPA-Approved Statutes and State Regulations in the California SIP

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Compiled Test Procedures, Test Methods, and Specifications (PDFs)

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EPA-Approved California Test Procedures, Test Methods, and Specifications

State Citation/Title/ Subject State Effective Date EPA Approval Date Additional Explanation
Method 2-1: Test Procedures for Determining the Efficiency of Gasoline Vapor Recovery Systems at Service Stations 9/1/1982

49 FR 18829,
5/3/1984

 Submitted on January 20, 1983. See 40 CFR 52.220(c)(149)(i)(A).
Method 2-2: Certification Procedures for Gasoline Vapor Recovery Systems at Service Stations 8/9/1978

47 FR 29668,
7/8/1982

 Submitted on April 23, 1980. See 40 CFR 52.220(c)(69)(iv).
Method 2-3: Certification and Test Procedures for Vapor Recovery Systems at Gasoline Bulk Plants 8/9/1978

47 FR 29668,
7/8/1982

 Submitted on April 23, 1980. See 40 CFR 52.220(c)(69)(iv).
Method 2-4: Certification and Test Procedures for Vapor Recovery Systems at Gasoline Terminals 4/18/1977

47 FR 29668,
7/8/1982

 Submitted on April 23, 1980. See 40 CFR 52.220(c)(69)(iv).
Certification Procedure CP-204 Certification Procedure for Vapor Recovery Systems of Cargo Tanks 7/12/2023 89 FR 8999, 2/9/2024 Submitted on September 13, 2023 as an attachment to a letter dated on September 8, 2023.
Test Procedure TP-204.1 Determination of Five Minute Static Pressure Performance of Vapor Recovery Systems of Cargo Tanks 4/1/2015 87 FR 19631, 4/5/2022 Submitted on August 22, 2018 as an attachment to a letter dated August 16, 2018.
Test Procedure TP-204.2 Determination of One Minute Static Pressure Performance of Vapor Recovery Systems of Cargo Tanks 4/1/2015 87 FR 19631, 4/5/2022 Submitted on August 22, 2018 as an attachment to a letter dated August 16, 2018.
Test Procedure TP-204.3 Determination of Leak(s) 4/1/2015 87 FR 19631, 4/5/2022 Submitted on August 22, 2018 as an attachment to a letter dated August 16, 2018.
Test Procedures for Gasoline Vapor Leak Detection Using Combustible Gas Detector 9/1/1982

49 FR 18829,
5/3/1984

 Submitted on January 20, 1983. See 40 CFR 52.220(c)(149)(i)(A).
California Procedures for Evaluating Alternative Specifications for Phase 2 Reformulated Gasoline Using the California Predictive Model 12/11/1998

75 FR 26653,
5/12/2010

 Submitted on June 15, 2004. See 40 CFR 52.220(c)(374)(i)(A)(2).
California Procedures for Evaluating Alternative Specifications for Gasoline Using Vehicle Emissions Testing 4/25/2001

75 FR 26653,
5/12/2010

 Submitted on June 15, 2004. See 40 CFR 52.220(c)(374)(i)(A)(4).
California Procedures for Evaluating Alternative Specifications for Phase 3 Reformulated Gasoline Using the California Predictive Model 8/7/2008

75 FR 26653,
5/12/2010

 Submitted on June 15, 2004. See 40 CFR 52.220(c)(375)(i)(A)(2).
Procedures for Using the California Model for California Reformulated Gasoline Blendstocks for Oxygenate Blending (CARBOB) 8/7/2008

75 FR 26653,
5/12/2010

 Submitted on June 15, 2004. See 40 CFR 52.220(c)(375)(i)(A)(3).
California Exhaust Emission Standards and Test Procedures for 2001 and Subsequent Model Passenger Cars, Light-Duty Trucks and Medium-Duty Vehicles, as last amended September 5, 2003 12/4/2003 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Motor Vehicle Emission Control and Smog Index Label Specifications for 1978 through 2003 Model Year Motorcycles, Light-, Medium- and Heavy-Duty Engines and Vehicles,” as last amended September 5, 2003 12/4/2003 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Smog Index Label Specifications for 2004 and Subsequent Model Passenger Cars and Light-Duty Trucks,” adopted September 5, 2003 12/4/2003 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Refueling Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles, as last amended September 5, 2003 12/4/2003 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Evaporative Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles, as amended June 22, 2006 2/17/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Refueling Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles, as last amended June 22, 2006 2/17/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards Test Procedures for 2001 and Subsequent Model Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles, as last amended June 22, 2006 2/17/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Otto-Cycle Engines, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Non-Methane Organic Gas Test Procedures, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California 2001 through 2014 Model Criteria Pollutant Exhaust Emission Standards and Test Procedures and 2009 through 2016 Model Greenhouse Gas Exhaust Emission Standards and Test Procedures for Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles, as last amended March 22, 2012, excluding GHG-related provisions 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Environmental Performance Label Specifications for 2009 and Subsequent Model Year Passenger Cars, Light-Duty Trucks, and Medium-Duty Passenger Vehicles, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Evaporative Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Refueling Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
Specifications for Fill Pipes and Openings of 1977 through 2014 Model Motor Vehicle Fuel Tanks, as last amended March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
Specifications for Fill Pipes and Openings of 2015 and Subsequent Model Motor Vehicle Fuel Tanks, adopted March 22, 2012 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California 2015 and Subsequent Model Criteria Pollutant Exhaust Emission Standards and Test Procedures and 2017 and Subsequent Model Greenhouse Gas Exhaust Emission Standards and Test Procedures for Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles, adopted March 22, 2012, excluding GHG-related provisions 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2009 through 2017 Model Zero-Emission Vehicles and Hybrid Electric Vehicles, in the Passenger Car, Light-Duty Truck, and Medium-Duty Vehicle Classes, as last amended March 22, 2012, excluding GHG-related provisions 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2018 and Subsequent Model Zero-Emission Vehicles and Hybrid Electric Vehicles, in the Passenger Car, Light-Duty Truck, and Medium-Duty Vehicle Classes, adopted March 22, 2012, excluding GHG-related provisions 8/7/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California 2015 and Subsequent Model Criteria Pollutant Exhaust Emission Standards and Test Procedures and 2017 and Subsequent Model Greenhouse Gas Exhaust Emission Standards and Test Procedures for Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles, as last amended December 6, 2012, excluding GHG-related provisions 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California 2001 through 2014 Model Criteria Pollutant Exhaust Emission Standards and Test Procedures and 2009 through 2016 Model Greenhouse Gas Exhaust Emission standards and Test Procedures for Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles, as last amended December 6, 2012, excluding GHG-related provisions 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Non-Methane Organic Gas Test Procedures, as last amended December 6, 2012 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Evaporative Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles, as last amended December 6, 2012 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Otto-Cycle Engines, as last amended December 6, 2012 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles, as last amended December 6, 2012 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2009 through 2017 Model Zero-Emission Vehicles and Hybrid Electric Vehicles, in the Passenger Car, Light-Duty Truck, and Medium-Duty Vehicle Classes, as last amended December 6, 2012 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2018 and Subsequent Model Zero-Emission Vehicles and Hybrid Vehicles, in the Passenger Car, Light-Duty Truck, and Medium-Duty Vehicle Classes, adopted December 6, 2012, excluding GHG-related provisions 12/31/2012 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Otto-cycle Engines, as last amended December 12, 2002 12/4/2003 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 1985 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles, as last amended October 25, 2001 11/17/2002 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Motor Vehicle Emission Control and Smog Index Label Specifications, as last amended October 22, 1999 11/22/1999 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines, as last amended September 1, 2006 11/15/2006 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2004 and Subsequent Model Heavy-Duty Diesel Engines and Vehicles, as last amended October 12, 2011 12/22/2011 83 FR 23232, 5/18/2018 Submitted by CARB on June 15, 2017.
California Exhaust Emission Standards and Test Procedures for New 2001 through 2006 Off-Road Large Spark-Ignition Engines, Parts I and II, adopted September 1, 1999 and as last amended March 2, 2007 5/12/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust and Evaporative Emission Standards and Test Procedures for 2007 through 2009 Off-Road Large Spark-Ignition Engines, (2007-2009 Test Procedure 1048), adopted March 2, 2007 5/12/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust and Evaporative Emission Standards and Test Procedures for New 2010 and Later Off-Road Large Spark-Ignition Engines, (2010 and Later Test Procedure 1048), adopted March 2, 2007 5/12/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust and Evaporative Emission Standards and Test Procedures for New 2010 and Later Off-Road Large Spark-Ignition Engines, (2010 and Later Test Procedure 1048), amended November 21, 2008 10/20/2009 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust and Evaporative Emission Standards and Test Procedures for New 2010 and Later Off-Road Large Spark-Ignition Engines, (2010 and Later Test Procedure 1048), amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust and Evaporative Emission Standards and Test Procedures for New 2007 and Later Off-Road Large Spark-Ignition Engines (Test Procedures 1065 and 1068), adopted March 2, 2007 5/12/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust and Evaporative Emission Standards and Test Procedures for New 2007 and Later Off-Road Large Spark-Ignition Engines (Test Procedures 1065 and 1068), amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
Small Off-Road Engine and Equipment Evaporative Emissions Test Procedure (TP-901), adopted July 26, 2004 10/20/2004 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
Small Off-Road Engine and Equipment Evaporative Emissions Test Procedure (TP-902), adopted July 26, 2004 10/20/2004 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
Small Off-Road Engine Evaporative Emission Control System Certification Procedure (CP-901), adopted July 26, 2004 10/20/2004 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
Small Off-Road Engine Evaporative Emission Control System Certification Procedure (CP-902), adopted July 26, 2004 10/20/2004 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for 2005 and Later Small Off-Road Engines, as last amended February 24, 2010 5/5/2010 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2005 and Later Small Off-Road Engines, as last amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for New 2013 and Later Small Off-Road Engines, Engine-Testing Procedures (Part 1054), adopted October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for New 2013 and Later Small Off-Road Engines, Engine-Testing Procedures (Part 1065), adopted October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for New 2000 and Later Tier 1, Tier 2, and Tier 3 Off-Road Compression-Ignition Engines, Part I-B, adopted January 28, 2000 and as last amended October 20, 2005 1/6/2006 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for New 1996 and Later Tier 1, Tier 2, and Tier 3 Off-Road Compression-Ignition Engines, Part II, adopted May 12, 1993 and as last amended October 20, 2005 1/6/2006 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for New 2008 and Later Tier 4 Off-Road Compression-Ignition Engines, Part I-C, adopted October 20, 2005 1/6/2006 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for New 2008-2010 Tier 4 Off-Road Compression-Ignition Engines, Part I-C, as last amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for New 2011 and Later Tier 4 Off-Road Compression-Ignition Engines, Part I-D, as last amended October 25, 2012 (excluding optional alternative NOX + NMHC standards and associated family emission limits in § 1039.102(e) 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for New 2011 and Later Tier 4 Off-Road Compression-Ignition Engines, Part I-F, as last amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for New 2011 and Later Tier 4 Off-Road Compression-Ignition Engines, Part I-E, adopted October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
California Exhaust Emission Standards and Test Procedures for 2001 Model Year and Later Spark-Ignition Marine Engines, as last amended June 5, 2009 8/16/2009 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emission Standards and Test Procedures for 2001 Model Year and Later Spark-Ignition Marine Engines, as last amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
Procedures for Exemption of Add-On and Modified Parts for Off-Road Categories, as last amended June 5, 2009 8/16/2009 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emissions Standards and Test Procedures for 1997 and Later Off-Highway Recreational Vehicles, and Engines, as last amended August 15, 2007 8/15/2007 81 FR 39424, 6/16/2016 Submitted by CARB on August 14, 2015.
California Exhaust Emissions Standards and Test Procedures for 1997 and Later Off-Highway Recreational Vehicles and Engines, as last amended October 25, 2012 1/10/2013 82 FR 14446, 3/21/2017 Submitted by CARB on December 7, 2016.
Test Procedures for Determining Evaporative Emissions from Off-Highway Recreational Vehicles (TP-933), adopted November 5, 2014 4/1/2015 83 FR 23232, 5/18/2018 Submitted by CARB on June 15, 2017.
Method 310 - Determination of Volatile Organic Compounds (VOC) in Consumer Products and Reactive Organic Compounds (ROC) in Aerosol Coating Products 5/25/2018 85 FR 57703, 9/16/2020 Submitted by CARB on June 4, 2019.

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Last updated on May 5, 2025