---
title: "Clean Truck Check Testers in Contra Costa County, CA (61)"
description: "61 CARB-credentialed Clean Truck Check testers in Contra Costa County, California, across 16 cities. 57 offer mobile testing. Search by city, see phone numbers…"
url: "https://ctcfinder.com/testers/contra-costa-county/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Clean Truck Check testers in Contra Costa County, California

61 testing businesses in 16 cities; 57 offer mobile testing, 38 do smoke opacity tests, 44 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

- [Antioch](https://ctcfinder.com/testers/contra-costa-county/antioch/) — 11 listings
- [Oakley](https://ctcfinder.com/testers/contra-costa-county/oakley/) — 9 listings
- [Concord](https://ctcfinder.com/testers/contra-costa-county/concord/) — 7 listings
- [Martinez](https://ctcfinder.com/testers/contra-costa-county/martinez/) — 7 listings
- [San Pablo](https://ctcfinder.com/testers/contra-costa-county/san-pablo/) — 7 listings
- [Pittsburg](https://ctcfinder.com/testers/contra-costa-county/pittsburg/) — 5 listings
- [Brentwood](https://ctcfinder.com/testers/contra-costa-county/brentwood/) — 3 listings
- [Richmond](https://ctcfinder.com/testers/contra-costa-county/richmond/) — 3 listings

## Alamo

- **[Ryan's Truck Repair](https://ctcfinder.com/tester/ryans-truck-repair-alamo/)** — 2106 Pebble Dr, Alamo, CA 94507 — (650) 222-0970. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Bay Point

- **[Amunique](https://ctcfinder.com/tester/amunique-bay-point/)** — 3628 Willow Pass Rd, Bay Point, CA 94565 — (925) 915-7888. Services: mobile testing, OBD testing.

## Danville

- **[Mobile Golden State Emissions](https://ctcfinder.com/tester/mobile-golden-state-emissions-danville/)** — 821 Orange Blossom Way, Danville, CA 94526 — (925) 818-1831. Services: mobile testing, OBD testing, motorhome testing.
- **[Tri-Valley Clean Truck Check / Cal Water Trucking](https://ctcfinder.com/tester/tri-valley-clean-truck-check-cal-water-trucking-danville/)** — 35 Surrey Ct, Danville, CA 94526 — (925) 708-3099. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Discovery Bay

- **[AAA Golden State Emissions Testing](https://ctcfinder.com/tester/aaa-golden-state-emissions-testing-discovery-bay/)** — 2115 Bridgeport Loop, Discovery Bay, CA 94505 — (925) 354-4370. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Hercules

- **[Hercules CTC Clean Truck Check & Bit Inspection LL](https://ctcfinder.com/tester/hercules-ctc-clean-truck-check-and-bit-inspection-ll-hercules/)** — 205 Ridgeview Ter, Hercules, CA 94547 — (510) 375-2397. Services: mobile testing, OBD testing.

## Pleasant Hill

- **[NorCal Diesel Solutions](https://ctcfinder.com/tester/norcal-diesel-solutions-pleasant-hill/)** — 16 Dudley Ct, Pleasant Hill, CA 94523 — (925) 405-7233. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Rodeo

- **[Michael Siverson](https://ctcfinder.com/tester/michael-siverson-rodeo/)** — Rodeo, CA 94572 — (510) 672-1557. Services: mobile testing, OBD testing.

## San Ramon

- **[Optivia Tech LLC](https://ctcfinder.com/tester/optivia-tech-llc-san-ramon/)** — 1934 Brookcliff Cir, San Ramon, CA 94582 — (415) 727-7227. Services: mobile testing, OBD testing, motorhome testing.


## Frequently asked questions

### How many Clean Truck Check testers are in Contra Costa County?

CTC Finder lists 61 testing businesses in Contra Costa County from CARB's public tester list (61 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 Contra Costa County?

Yes. 57 listed businesses in Contra Costa 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 Contra Costa 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/).