---
title: "Clean Truck Check Testers in San Mateo County, CA (31)"
description: "31 CARB-credentialed Clean Truck Check testers in San Mateo County, California, across 14 cities. 27 offer mobile testing. Search by city, see phone numbers…"
url: "https://ctcfinder.com/testers/san-mateo-county/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Clean Truck Check testers in San Mateo County, California

31 testing businesses in 14 cities; 27 offer mobile testing, 17 do smoke opacity tests, 26 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.

## City pages

- [South San Francisco](https://ctcfinder.com/testers/san-mateo-county/south-san-francisco/) — 5 listings
- [Daly City](https://ctcfinder.com/testers/san-mateo-county/daly-city/) — 4 listings
- [San Bruno](https://ctcfinder.com/testers/san-mateo-county/san-bruno/) — 4 listings
- [San Mateo](https://ctcfinder.com/testers/san-mateo-county/san-mateo/) — 4 listings
- [Redwood City](https://ctcfinder.com/testers/san-mateo-county/redwood-city/) — 3 listings

## Brisbane

- **[A1 Mobile Clean Truck Check LLC](https://ctcfinder.com/tester/a1-mobile-clean-truck-check-llc-brisbane/)** — 350 Glen Park Way, Brisbane, CA 94005 — (415) 806-9121. Services: mobile testing, OBD testing, motorhome testing.

## Burlingame

- **[Mohammad Najafpir](https://ctcfinder.com/tester/mohammad-najafpir-burlingame/)** — Burlingame, CA 94010 — (650) 771-8865. Services: mobile testing, OBD testing, motorhome testing.

## Half Moon Bay

- **[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. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## La Honda

- **[Rolling Wrench Truck & Trailer Repair Inc.](https://ctcfinder.com/tester/rolling-wrench-truck-and-trailer-repair-inc-la-honda/)** — 23 Pope Rd, La Honda, CA 94020 — (650) 921-0487. Services: mobile testing, OBD testing, motorhome testing.

## Menlo Park

- **[TJF Solutions](https://ctcfinder.com/tester/tjf-solutions-menlo-park/)** — 3523 Haven Ave, Menlo Park, CA 94025 — (650) 771-4532. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Pacifica

- **[Anthony Ricks](https://ctcfinder.com/tester/anthony-ricks-pacifica/)** — Pacifica, CA 94044 — (415) 875-0124. Services: mobile testing, OBD testing, motorhome testing.
- **[Middleman Liens](https://ctcfinder.com/tester/middleman-liens-pacifica/)** — Pacifica, CA 94044 — (415) 305-5454. Services: mobile testing, OBD testing, motorhome testing.

## Portola Valley

- **[Ron Ramies Inc](https://ctcfinder.com/tester/ron-ramies-inc-portola-valley/)** — 115 Portola Rd, Portola Valley, CA 94028 — (650) 400-2116. Services: mobile testing, OBD testing, motorhome testing.

## San Carlos

- **[Holly Smog](https://ctcfinder.com/tester/holly-smog-san-carlos/)** — 501 Old County Rd Suite A, San Carlos, CA 94070 — (650) 595-1388. Services: mobile testing, OBD testing, motorhome testing.
- **[Carbcheck1](https://ctcfinder.com/tester/carbcheck1-san-carlos/)** — San Carlos, CA 94070 — (650) 430-3981. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## San Gregorio

- **[Skylonda Equipment](https://ctcfinder.com/tester/skylonda-equipment-san-gregorio/)** — 4446 LA Honda Rd, San Gregorio, CA 94074 — (650) 868-0037. Services: mobile testing, OBD testing, motorhome testing.


## Frequently asked questions

### How many Clean Truck Check testers are in San Mateo County?

CTC Finder lists 31 testing businesses in San Mateo County from CARB's public tester list (33 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 County?

Yes. 27 listed businesses in San Mateo 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 San Mateo 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](https://ctcfinder.com/guide/cost/).