Clean Truck Check testers in Stanislaus County
53 testing businesses in Stanislaus County are on CARB's public tester list, in 10 cities. 47 (89%) offer mobile testing, 22 do smoke opacity tests and 34 test motorhomes.
Cities in Stanislaus
Other cities
Crows Landing
-
Tonys Truck & Trailer Repair INC
- Mobile testing
- OBD test
- Motorhomes
Keyes
-
Diesel Pollution Solutions
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Patterson
-
Cencal Mobile CTC
- Mobile testing
- OBD test
- Motorhomes
-
Marycruz Angelica Morgado Montiel
- OBD test
- Motorhomes
Riverbank
-
Freedom smog
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Salida
-
Amador Castaneda
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
The Smog GUY
- OBD test
- Motorhomes
Trucking in Stanislaus
Stanislaus County (Modesto, Turlock, Ceres) has many food-processing and agricultural fleets on SR-99.
Frequently asked questions
How many Clean Truck Check testers are in Stanislaus County?
CTC Finder lists 53 testing businesses in Stanislaus County from CARB's public tester list (54 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 Stanislaus County?
Yes. 47 listed businesses in Stanislaus 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 Stanislaus 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.