---
title: "Clean Truck Check Testers in Merced County, CA (40)"
description: "40 CARB-credentialed Clean Truck Check testers in Merced County, California, across 10 cities. 35 offer mobile testing. Search by city, see phone numbers and…"
url: "https://ctcfinder.com/testers/merced-county/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Clean Truck Check testers in Merced County, California

40 testing businesses in 10 cities; 35 offer mobile testing, 12 do smoke opacity tests, 21 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

- [Merced](https://ctcfinder.com/testers/merced-county/merced/) — 13 listings
- [Los Banos](https://ctcfinder.com/testers/merced-county/los-banos/) — 8 listings
- [Atwater](https://ctcfinder.com/testers/merced-county/atwater/) — 5 listings
- [Dos Palos](https://ctcfinder.com/testers/merced-county/dos-palos/) — 4 listings
- [Livingston](https://ctcfinder.com/testers/merced-county/livingston/) — 3 listings

## Delhi

- **[Hargreaves Ranches LLC](https://ctcfinder.com/tester/hargreaves-ranches-llc-delhi/)** — 17736 Swanson Rd, Delhi, CA 95315 — (209) 988-7214. Services: mobile testing, OBD testing.

## Gustine

- **[Enriquez CTC Check](https://ctcfinder.com/tester/enriquez-ctc-check-gustine/)** — 78 S Mars St, Gustine, CA 95322 — (209) 564-0955. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Javier Diaz](https://ctcfinder.com/tester/javier-diaz-gustine/)** — Gustine, CA 95322 — (209) 342-8445. Services: mobile testing, OBD testing, motorhome testing.

## Planada

- **[Rodriguez Smog](https://ctcfinder.com/tester/rodriguez-smog-planada/)** — 9075 State Highway 140, Planada, CA 95365 — (209) 410-8544. Services: mobile testing, OBD testing.

## Stevinson

- **[Valley SmogWorks](https://ctcfinder.com/tester/valley-smogworks-stevinson/)** — 19240 First Ave, Stevinson, CA 95374 — (209) 232-5880. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.

## Winton

- **[Dan's CTC](https://ctcfinder.com/tester/dans-ctc-winton/)** — 6760 California St, Winton, CA 95388 — (209) 564-1633. Services: mobile testing, OBD testing, motorhome testing.
- **[Taylor's](https://ctcfinder.com/tester/taylors-winton/)** — 6171 N Winton Way, Winton, CA 95388 — (209) 261-1048. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.


## Frequently asked questions

### How many Clean Truck Check testers are in Merced County?

CTC Finder lists 40 testing businesses in Merced County from CARB's public tester list (40 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 Merced County?

Yes. 35 listed businesses in Merced 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 Merced 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/).