List of Approved Independent Contractors
Contact
Below is a list of Independent Contractors currently approved for some test methods. CARB staff has reviewed the contact information and believes it to be accurate but does not assume any responsibility for any errors or inaccuracies that may exist herein. CARB staff may revise the information contained in this document at any time. To request a copy of any of the below listed executive orders, contact the Independent Contractor Program with your request as well as any accommodations that you may need.
| Contractor | Location | Current EO | Expiration Date | Approved Test Methods |
|---|---|---|---|---|
| Absolute Air Testing, Incorporated | Garden Grove, California | I-24-007 | June 30, 2026 | CARB 1, 2, 3, 4, and 100 (CO, CO2, NOX, O2) U.S. EPA 205 |
| Accurate Environmental Services, Incorporated | Stanton, CA | I-24-013 | June 30, 2027 | CARB 1, 2, 4 |
| AECOM Technical Services | Orange, California | I-23-019 | June 30, 2025 | CARB 1, 2, 3, 4, 5, and 100 (CO, CO2, NOX, O2, THC) |
| Air Hygiene International, Incorporated | Broken Arrow, Oklahoma | I-24-005 | June 30, 2026 | CARB 1, 2, 3, 4, 5, and 100 (CO, CO2, NOX, O2, THC) U.S. EPA 201A and 202 |
| Air Quality Engineering, Incorporated | Santa Ana, California | I-23-016 | June 30, 2025 | CARB 1, 2, 3, 4, 5, and 100 (CO, CO2, NOX, O2, SO2) U.S. EPA 205 |
| AIRx Testing Services, Incorporated | Ventura, California | I-24-014 | June 30, 2027 | CARB 1, 2, 3, 4, 5, 100 (CO, CO2, NOX, O2, SO2, THC), and VEE U.S. EPA 201A, 202, and 205 |
| Alliance Source Testing, LLC | Bakersfield, California | I-24-012 | June 30, 2027 | CARB 1, 2, 3, 4, 5, 6, 8, 17, 20, and 100 (CO, CO2, NOX, O2, SO2) and VEE U.S. EPA 18, 201A, 202, and 205 |
| Best Environmental | Livermore, California | I-24-003 | June 30, 2025 | CARB 1, 2, 3, 4, 5, 8, 11, 17, 100 (CO, CO2, NOX, O2, SO2, THC), and VEE U.S. EPA 15A, 18, 201A, and 202 |
| Blue Sky Environmental, Incorporated | Hayward, California | I-24-004 | June 30, 2026 | CARB 1, 2, 3, 4, and, 100 (CO, CO2, NOX, O2, SO2, THC) |
| Broadbent & Associates, Incorporated | Henderson, Nevada | I-24-006 | June 30, 2026 | CARB 1, 2, 3, 4, 5, 17, and 100 (CO, CO2, NOX, O2, SO2, THC) U.S. EPA 201A, 202, and 205 |
| Energy Environmental Solutions, Incorporated | Anaheim, California | I-24-011 | June 30, 2026 | CARB 1, 2, 3, 4, and 100 (CO, CO2, NOX, O2) |
| Erthwrks, Incorporated | Austin, Texas | I-23-018 | June 30, 2025 | CARB 1, 2, 2A, 3, 4, and 100 (CO, CO2, NOX, O2, THC) U.S. EPA 2B, 2C, and 19 (determining the emission rate of NOX, on an hourly basis, if the appropriate F factors can be determined from Table 19-2 of the method) |
| Montrose Air Quality Services, LLC | Santa Ana, California | I-24-008 | June 30, 2026 | CARB 1, 2, 3, 4, 5, 6, 8, 17, 20, 100 (CO, CO2, NOX, O2, SO2, THC), and VEE U.S. EPA 201A, 202, and 205 |
| Reliable Emission Measurements, Incorporated | Auberry, California | I-24-009 | June 30, 2026 | CARB 1, 2, 3, 4, 5, and 100 (CO, CO2, NOX, O2) U.S. EPA 201A |
| San Joaquin Valley Air Pollution Control District | Bakersfield, California | I-23-017 | June 30, 2026 | CARB 1, 2, 3, 4, and 100 (CO, CO2, NOX, O2) U.S. EPA 205 |
| TRC Environmental | Bakersfield, California | I-23-020 | June 30, 2025 | CARB 1, 2, 2A, 3, 4 5, 20, 100 (CO, CO2, NOX, O2, SO2, THC), and VEE U.S. EPA 18, 19 (determining the emission rate of NOX, on an hourly basis, if the appropriate F factors can be determined from Table 19-2 of the method) 201A, 202, and 205 |