Clean Truck Check testers in Contra Costa County
61 testing businesses in Contra Costa County are on CARB's public tester list, in 16 cities. 57 (93%) offer mobile testing, 38 do smoke opacity tests and 44 test motorhomes.
Cities in Contra Costa
Other cities
Alamo
-
Ryan's Truck Repair
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Bay Point
-
Amunique
- Mobile testing
- OBD test
Danville
-
Mobile Golden State Emissions
- Mobile testing
- OBD test
- Motorhomes
-
Tri-Valley Clean Truck Check / Cal Water Trucking
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Discovery Bay
-
AAA Golden State Emissions Testing
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Hercules
-
Hercules CTC Clean Truck Check & Bit Inspection LL
- Mobile testing
- OBD test
Pleasant Hill
-
NorCal Diesel Solutions
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Rodeo
-
Michael Siverson
- Mobile testing
- OBD test
San Ramon
-
Optivia Tech LLC
- Mobile testing
- OBD test
- Motorhomes
Frequently asked questions
How many Clean Truck Check testers are in Contra Costa County?
CTC Finder lists 61 testing businesses in Contra Costa County from CARB's public tester list (61 credentialed testers), last checked November 1, 2026. Listing on CARB's list is optional, so the real number can be higher.
Is there mobile Clean Truck Check testing in Contra Costa County?
Yes. 57 listed businesses in Contra Costa County offer mobile testing, which means the tester comes to your yard. Use the Mobile filter above to see them.
How much does a Clean Truck Check test cost in Contra Costa County?
Testers set their own prices. Published prices for an OBD test are usually $50–$135 per vehicle; smoke opacity tests for older trucks often cost more, and mobile testers may add a trip fee. See the cost guide.
Source: CARB's public Clean Truck Check tester list, last checked . Listing on CARB's list is optional for testers, so some credentialed testers are not shown. Services, hours and prices change; please confirm with the tester before you go. Something wrong? Send a correction.