Clean Truck Check testers in the Inland Empire

528 testing businesses in the Inland Empire (San Bernardino and Riverside counties) are on CARB's public Clean Truck Check tester list, with 562 credentialed testers. 476 (90%) offer mobile testing at your yard, 200 do smoke opacity tests for older trucks and 370 test motorhomes. The largest city pages are Fontana (49), Riverside (48), Ontario (31).

Counties in the Inland Empire

Cities with their own page

Smaller cities are listed on their county page.

Testing businesses with several credentialed testers

More credentialed testers usually means more capacity for fleets and before deadlines.

Trucking in the Inland Empire: what to know

The Inland Empire holds roughly a billion square feet of warehouse space (Pitzer College estimate), so local fleets and owner-operators run a high volume of tests. Mobile testers who visit distribution centers and truck yards are common here. The region also covers the High Desert along I-15 and the Coachella Valley, and BNSF's intermodal yard in San Bernardino, where facilities must verify Clean Truck Check compliance at entry or log non-compliant trucks (CARB).

What a Clean Truck Check costs here

Testers set their own prices. Across the California prices we found, an OBD test usually costs $50–$135 per vehicle and a smoke opacity test $190–$200, plus CARB's annual fee ($32.13 in 2026, $33.12 in 2027). Cost guide · Remote and telematics testing.

Frequently asked questions

How many Clean Truck Check testers are in the Inland Empire?

CTC Finder lists 528 testing businesses in the Inland Empire from CARB's public tester list (562 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 the Inland Empire?

Yes. 476 listed businesses in the Inland Empire offer mobile testing, which means the tester comes to your yard. Each city page has a Mobile filter; see also mobile testers.

How much does a Clean Truck Check test cost in the Inland Empire?

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.

Which Inland Empire cities have the most Clean Truck Check testers?

Fontana (49), Riverside (48), Ontario (31). Every city with 3 or more listings has its own page with phone numbers and a Mobile filter.

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.