Clean Truck Check testers in Marin County
4 testing businesses in Marin County are on CARB's public tester list, in 4 cities. 3 (75%) offer mobile testing, 1 do smoke opacity tests and 3 test motorhomes.
Testers by city
Belvedere Tiburon
-
Redwood Engineering
- Mobile testing
- OBD test
- Motorhomes
Novato
-
Hamilton's Smog
- OBD test
- Motorhomes
San Rafael
-
Emeraldauto
- Mobile testing
- OBD test
- Motorhomes
Tomales
-
Mobile HD services
- Mobile testing
- OBD test
- Smoke opacity
Frequently asked questions
How many Clean Truck Check testers are in Marin County?
CTC Finder lists 4 testing businesses in Marin County from CARB's public tester list (5 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 Marin County?
Yes. 3 listed businesses in Marin 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 Marin 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.