Clean Truck Check testers in the Los Angeles & Orange County

675 testing businesses in the Los Angeles & Orange County (Greater Los Angeles, the Ports of Los Angeles and Long Beach) are on CARB's public Clean Truck Check tester list, with 714 credentialed testers. 611 (91%) offer mobile testing at your yard, 274 do smoke opacity tests for older trucks and 471 test motorhomes. The largest city pages are Los Angeles (69), Long Beach (26), Anaheim (25).

Counties in the Los Angeles & Orange County

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 Los Angeles & Orange County: what to know

Truck traffic to the Ports of Los Angeles and Long Beach (the San Pedro Bay port complex) is heavy, and seaport and intermodal railyard facilities must verify Clean Truck Check compliance at entry or log non-compliant trucks (CARB). Testers here serve port drayage near Wilmington, San Pedro and Carson, the industrial districts of South LA, the San Fernando Valley and north Orange County along the 91, the 57 and I-5.

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 Los Angeles & Orange County?

CTC Finder lists 675 testing businesses in the Los Angeles & Orange County from CARB's public tester list (714 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 Los Angeles & Orange County?

Yes. 611 listed businesses in the Los Angeles & Orange County 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 Los Angeles & Orange 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.

Which Los Angeles & Orange County cities have the most Clean Truck Check testers?

Los Angeles (69), Long Beach (26), Anaheim (25). 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.