---
title: "Clean Truck Check Testers in the San Joaquin Valley (544)"
description: "544 CARB-credentialed Clean Truck Check testers in the San Joaquin Valley (the Central Valley from Stockton to Bakersfield): 467 offer mobile testing, 228 do…"
url: "https://ctcfinder.com/testers/san-joaquin-valley/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Clean Truck Check testers in the San Joaquin Valley

544 testing businesses in the San Joaquin Valley (the Central Valley from Stockton to Bakersfield) are on CARB's public Clean Truck Check tester list (565 credentialed testers). 467 offer mobile testing, 228 do smoke opacity tests, 351 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.

## Counties

- [San Joaquin County](https://ctcfinder.com/testers/san-joaquin-county/) — 124 testers
- [Fresno County](https://ctcfinder.com/testers/fresno-county/) — 123 testers
- [Kern County](https://ctcfinder.com/testers/kern-county/) — 107 testers
- [Tulare County](https://ctcfinder.com/testers/tulare-county/) — 62 testers
- [Stanislaus County](https://ctcfinder.com/testers/stanislaus-county/) — 53 testers
- [Merced County](https://ctcfinder.com/testers/merced-county/) — 40 testers
- [Madera County](https://ctcfinder.com/testers/madera-county/) — 22 testers
- [Kings County](https://ctcfinder.com/testers/kings-county/) — 13 testers

## City pages

- [Bakersfield](https://ctcfinder.com/testers/kern-county/bakersfield/) (Kern County) — 78 testers
- [Fresno](https://ctcfinder.com/testers/fresno-county/fresno/) (Fresno County) — 74 testers
- [Stockton](https://ctcfinder.com/testers/san-joaquin-county/stockton/) (San Joaquin County) — 50 testers
- [Modesto](https://ctcfinder.com/testers/stanislaus-county/modesto/) (Stanislaus County) — 23 testers
- [Tracy](https://ctcfinder.com/testers/san-joaquin-county/tracy/) (San Joaquin County) — 21 testers
- [Manteca](https://ctcfinder.com/testers/san-joaquin-county/manteca/) (San Joaquin County) — 19 testers
- [Visalia](https://ctcfinder.com/testers/tulare-county/visalia/) (Tulare County) — 19 testers
- [Madera](https://ctcfinder.com/testers/madera-county/madera/) (Madera County) — 15 testers
- [Merced](https://ctcfinder.com/testers/merced-county/merced/) (Merced County) — 13 testers
- [Lodi](https://ctcfinder.com/testers/san-joaquin-county/lodi/) (San Joaquin County) — 12 testers
- [Selma](https://ctcfinder.com/testers/fresno-county/selma/) (Fresno County) — 11 testers
- [Escalon](https://ctcfinder.com/testers/san-joaquin-county/escalon/) (San Joaquin County) — 10 testers
- [Tulare](https://ctcfinder.com/testers/tulare-county/tulare/) (Tulare County) — 10 testers
- [Clovis](https://ctcfinder.com/testers/fresno-county/clovis/) (Fresno County) — 9 testers
- [Los Banos](https://ctcfinder.com/testers/merced-county/los-banos/) (Merced County) — 8 testers
- [Ceres](https://ctcfinder.com/testers/stanislaus-county/ceres/) (Stanislaus County) — 7 testers
- [Turlock](https://ctcfinder.com/testers/stanislaus-county/turlock/) (Stanislaus County) — 7 testers
- [Hanford](https://ctcfinder.com/testers/kings-county/hanford/) (Kings County) — 7 testers
- [Porterville](https://ctcfinder.com/testers/tulare-county/porterville/) (Tulare County) — 6 testers
- [Delano](https://ctcfinder.com/testers/kern-county/delano/) (Kern County) — 6 testers
- [Lathrop](https://ctcfinder.com/testers/san-joaquin-county/lathrop/) (San Joaquin County) — 5 testers
- [Oakdale](https://ctcfinder.com/testers/stanislaus-county/oakdale/) (Stanislaus County) — 5 testers
- [Atwater](https://ctcfinder.com/testers/merced-county/atwater/) (Merced County) — 5 testers
- [Fowler](https://ctcfinder.com/testers/fresno-county/fowler/) (Fresno County) — 5 testers
- [Lemoore](https://ctcfinder.com/testers/kings-county/lemoore/) (Kings County) — 5 testers
- [Denair](https://ctcfinder.com/testers/stanislaus-county/denair/) (Stanislaus County) — 4 testers
- [Dos Palos](https://ctcfinder.com/testers/merced-county/dos-palos/) (Merced County) — 4 testers
- [Reedley](https://ctcfinder.com/testers/fresno-county/reedley/) (Fresno County) — 4 testers
- [Sanger](https://ctcfinder.com/testers/fresno-county/sanger/) (Fresno County) — 4 testers
- [Dinuba](https://ctcfinder.com/testers/tulare-county/dinuba/) (Tulare County) — 4 testers
- [Shafter](https://ctcfinder.com/testers/kern-county/shafter/) (Kern County) — 4 testers
- [French Camp](https://ctcfinder.com/testers/san-joaquin-county/french-camp/) (San Joaquin County) — 3 testers
- [Ripon](https://ctcfinder.com/testers/san-joaquin-county/ripon/) (San Joaquin County) — 3 testers
- [Livingston](https://ctcfinder.com/testers/merced-county/livingston/) (Merced County) — 3 testers
- [Kerman](https://ctcfinder.com/testers/fresno-county/kerman/) (Fresno County) — 3 testers
- [Mendota](https://ctcfinder.com/testers/fresno-county/mendota/) (Fresno County) — 3 testers
- [Pixley](https://ctcfinder.com/testers/tulare-county/pixley/) (Tulare County) — 3 testers
- [Ridgecrest](https://ctcfinder.com/testers/kern-county/ridgecrest/) (Kern County) — 3 testers
- [Tehachapi](https://ctcfinder.com/testers/kern-county/tehachapi/) (Kern County) — 3 testers

## Testing businesses with several credentialed testers

- **[Performance Truck and Diesel](https://ctcfinder.com/tester/performance-truck-and-diesel-bakersfield/)** — 2429 Fruitvale Ave Suite 3, Bakersfield, CA 93308 — (661) 395-0882. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[California Mobile CTC LLC - WE COME TO YOU](https://ctcfinder.com/tester/california-mobile-ctc-llc-we-come-to-you-fresno/)** — 1612 Fulton St, Fresno, CA 93721 — (559) 578-0357. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Holloway Construction, Inc.](https://ctcfinder.com/tester/holloway-construction-inc-hanford/)** — 13069 13th Rd W, Hanford, CA 93230 — (559) 772-9060. Services: OBD testing, motorhome testing.
- **[Velox Clean Truck Certification](https://ctcfinder.com/tester/velox-clean-truck-certification-bakersfield/)** — 4905 Oak Canyon Ct, Bakersfield, CA 93308 — (661) 625-7863. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[A&B Truck Repair, Inc.](https://ctcfinder.com/tester/a-and-b-truck-repair-inc-modesto-2/)** — 959 S 9th St, Modesto, CA 95351 — (209) 527-6971. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Anthony Solorio](https://ctcfinder.com/tester/anthony-solorio-visalia/)** — Visalia, CA 93292 — (559) 731-6885. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Bakersfield Truck Center](https://ctcfinder.com/tester/bakersfield-truck-center-bakersfield/)** — 8140 Golden State Hwy, Bakersfield, CA 93308 — (661) 340-8112. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[California Clean Truck Check](https://ctcfinder.com/tester/california-clean-truck-check-stockton/)** — 5250 Claremont Ave, Stockton, CA 95207 — (209) 636-7580. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Carlos Jaimes Fuentes](https://ctcfinder.com/tester/carlos-jaimes-fuentes-farmersville/)** — Farmersville, CA 93223 — (559) 667-2669. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Cummins inc](https://ctcfinder.com/tester/cummins-inc-bakersfield/)** — 4601 E Brundage Ln, Bakersfield, CA 93307 — (661) 325-9404. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Ramon Gutierrez](https://ctcfinder.com/tester/ramon-gutierrez-bakersfield/)** — Bakersfield, CA 93314 — (661) 304-9910. Services: mobile testing, OBD testing, motorhome testing.

## Trucking in the San Joaquin Valley

The San Joaquin Valley runs along SR-99 and I-5 from Stockton to Bakersfield, with farm, food-processing, dairy, oil-field and long-haul fleets and a growing cluster of distribution centers around Stockton, Tracy and Lathrop. Agricultural vehicles used only in farming test once a year; other trucks follow the normal schedule.

## Cost

Typical published prices in California: OBD test $50–$135 per vehicle; smoke opacity test $190–$200; CARB annual fee $32.13 (2026), $33.12 (2027).

## Frequently asked questions

### How many Clean Truck Check testers are in the San Joaquin Valley?

CTC Finder lists 544 testing businesses in the San Joaquin Valley from CARB's public tester list (565 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 San Joaquin Valley?

Yes. 467 listed businesses in the San Joaquin Valley offer mobile testing, which means the tester comes to your yard. Each city page has a Mobile filter; see also [mobile testers](https://ctcfinder.com/mobile-testers/).

### How much does a Clean Truck Check test cost in the San Joaquin Valley?

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/).

### Which San Joaquin Valley cities have the most Clean Truck Check testers?

Bakersfield (78), Fresno (74), Stockton (50). Every city with 3 or more listings has its own page with phone numbers and a Mobile filter.