---
title: "Clean Truck Check Testers in San Joaquin County, CA (124)"
description: "124 CARB-credentialed Clean Truck Check testers in San Joaquin County, California, across 9 cities. 111 offer mobile testing. Search by city, see phone numbers…"
url: "https://ctcfinder.com/testers/san-joaquin-county/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Clean Truck Check testers in San Joaquin County, California

124 testing businesses in 9 cities; 111 offer mobile testing, 53 do smoke opacity tests, 79 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

- [Stockton](https://ctcfinder.com/testers/san-joaquin-county/stockton/) — 50 listings
- [Tracy](https://ctcfinder.com/testers/san-joaquin-county/tracy/) — 21 listings
- [Manteca](https://ctcfinder.com/testers/san-joaquin-county/manteca/) — 19 listings
- [Lodi](https://ctcfinder.com/testers/san-joaquin-county/lodi/) — 12 listings
- [Escalon](https://ctcfinder.com/testers/san-joaquin-county/escalon/) — 10 listings
- [Lathrop](https://ctcfinder.com/testers/san-joaquin-county/lathrop/) — 5 listings
- [French Camp](https://ctcfinder.com/testers/san-joaquin-county/french-camp/) — 3 listings
- [Ripon](https://ctcfinder.com/testers/san-joaquin-county/ripon/) — 3 listings

## Acampo

- **[JESUS Lopez](https://ctcfinder.com/tester/jesus-lopez-acampo/)** — Acampo, CA 95220 — (209) 400-3749. Services: OBD testing, smoke opacity (non-OBD) testing.
- **[Rene's Truck Testing Service](https://ctcfinder.com/tester/renes-truck-testing-service-acampo/)** — 24545 N Suttenfield Rd, Acampo, CA 95220 — (510) 882-0730. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Trucking in San Joaquin

San Joaquin County (Stockton, Tracy, Manteca, Lathrop) is a major Northern California distribution-center region, with the Port of Stockton on the San Joaquin River.

## Frequently asked questions

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

CTC Finder lists 124 testing businesses in San Joaquin County from CARB's public tester list (125 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 Joaquin County?

Yes. 111 listed businesses in San Joaquin 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 Joaquin 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/).