--- title: "Clean Truck Check Testers in San Mateo, CA (4 listed)" description: "Find 4 CARB-credentialed Clean Truck Check testers in San Mateo, San Mateo County: 3 offer mobile testing, 1 do smoke opacity tests. Phone numbers, services…" url: "https://ctcfinder.com/testers/san-mateo-county/san-mateo/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in San Mateo, CA 4 testing businesses in San Mateo (San Mateo County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 3 offer mobile testing, 1 do smoke opacity tests, 4 test motorhomes. > CTC Finder is an independent directory, not affiliated with CARB. Tester data: CARB Clean Truck Check public tester list, last checked November 1, 2026. Confirm services, hours and prices with the tester. ## Testers in San Mateo - **[Charlotte Cuschieri](https://ctcfinder.com/tester/charlotte-cuschieri-san-mateo/)** — San Mateo, CA 94402 — (650) 455-8824. Services: OBD testing, motorhome testing. - **[EV Auto Service LLC](https://ctcfinder.com/tester/ev-auto-service-llc-san-mateo/)** — 110 S Claremont St, San Mateo, CA 94401 — (650) 293-7738. Services: mobile testing, OBD testing, motorhome testing. - **[Less Smog Check](https://ctcfinder.com/tester/less-smog-check-san-mateo/)** — 3925 S El Camino Real, San Mateo, CA 94403 — (669) 377-4881. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mobile Golden State Emissions San Mateo](https://ctcfinder.com/tester/mobile-golden-state-emissions-san-mateo-san-mateo/)** — 3500 Edison St., San Mateo, CA 94403 — (925) 818-1831. Services: mobile testing, OBD testing, motorhome testing. ## More testers within 20 miles - **[Mohammad Najafpir](https://ctcfinder.com/tester/mohammad-najafpir-burlingame/)** — Burlingame, CA 94010 — (650) 771-8865 — 4 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Carbcheck1](https://ctcfinder.com/tester/carbcheck1-san-carlos/)** — San Carlos, CA 94070 — (650) 430-3981 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Holly Smog](https://ctcfinder.com/tester/holly-smog-san-carlos/)** — 501 Old County Rd Suite A, San Carlos, CA 94070 — (650) 595-1388 — 4 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Balboni Electric](https://ctcfinder.com/tester/balboni-electric-redwood-city/)** — 823 Cleveland St, Redwood City, CA 94061 — (650) 766-4997 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Filthy Busters Inc.](https://ctcfinder.com/tester/filthy-busters-inc-redwood-city/)** — 1249 Sabrina Ct, Redwood City, CA 94061 — (510) 326-5901 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Peninsula Truck Repair, INC.](https://ctcfinder.com/tester/peninsula-truck-repair-inc-redwood-city/)** — 3018 Spring St, Redwood City, CA 94063 — (831) 419-7042 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Bay Area Clean Truck Check](https://ctcfinder.com/tester/bay-area-clean-truck-check-half-moon-bay/)** — 551 San Mateo Rd, Half Moon Bay, CA 94019 — (650) 673-2000 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Ernesto Gutierrez](https://ctcfinder.com/tester/ernesto-gutierrez-san-bruno/)** — San Bruno, CA 94066 — (650) 686-1783 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[JTL Mobile CARB Testing](https://ctcfinder.com/tester/jtl-mobile-carb-testing-san-bruno/)** — 1282 Park Ave, San Bruno, CA 94066 — (415) 272-7467 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[MAS Global, Inc](https://ctcfinder.com/tester/mas-global-inc-san-bruno/)** — 1141 San Mateo Ave, San Bruno, CA 94066 — (650) 278-8905 — 8 mi. Services: mobile testing, OBD testing. - **[Oleksii Tsymbal](https://ctcfinder.com/tester/oleksii-tsymbal-san-bruno/)** — San Bruno, CA 94066 — (408) 480-4155 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mobile Golden State Emissions Testing South City](https://ctcfinder.com/tester/mobile-golden-state-emissions-testing-south-city-south-san-francisco/)** — 988 El Camino Real, South San Francisco, CA 94080 — (925) 354-4370 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## Cost Typical published prices in California: OBD test $50–$135 per vehicle; smoke opacity test $190–$200. Prices are set by each tester. ## Frequently asked questions ### How many Clean Truck Check testers are in San Mateo? CTC Finder lists 4 testing businesses in San Mateo from CARB's public tester list (4 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 San Mateo? Yes. 3 listed businesses in San Mateo 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 San Mateo? 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](https://ctcfinder.com/guide/cost/). ### How often does my truck need a Clean Truck Check test? Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). ## Nearby cities - [Redwood City](https://ctcfinder.com/testers/san-mateo-county/redwood-city/) — 3 listings, 7 mi - [San Bruno](https://ctcfinder.com/testers/san-mateo-county/san-bruno/) — 4 listings, 8 mi - [South San Francisco](https://ctcfinder.com/testers/san-mateo-county/south-san-francisco/) — 5 listings, 9 mi - [Daly City](https://ctcfinder.com/testers/san-mateo-county/daly-city/) — 4 listings, 12 mi - [Hayward](https://ctcfinder.com/testers/alameda-county/hayward/) — 18 listings, 13 mi - [San Lorenzo](https://ctcfinder.com/testers/alameda-county/san-lorenzo/) — 3 listings, 13 mi - [Union City](https://ctcfinder.com/testers/alameda-county/union-city/) — 6 listings, 13 mi - [San Leandro](https://ctcfinder.com/testers/alameda-county/san-leandro/) — 8 listings, 15 mi - [San Francisco](https://ctcfinder.com/testers/san-francisco-county/san-francisco/) — 7 listings, 15 mi - [Newark](https://ctcfinder.com/testers/alameda-county/newark/) — 4 listings, 16 mi