---
title: "William Hunter — Clean Truck Check, Yuma, AZ | CTC Finder"
description: "William Hunter in Yuma, AZ is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing…"
url: "https://ctcfinder.com/tester/william-hunter-yuma-az/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# William Hunter

Clean Truck Check tester in Yuma, AZ.

> 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.

| Field | Value |
|---|---|
| Location | Yuma, AZ 85365 |
| Phone | (928) 920-8726 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks William Hunter can test

| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Yes |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Yes |
| Diesel, model year 2012 or older (no OBD) | Smoke opacity test (SAE J1667) plus visual inspection | Yes |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

## Clean Truck Check testers in Arizona

William Hunter is one of 43 testing businesses in Arizona on CARB's public tester list. 36 of them offer mobile testing and 9 do smoke opacity tests.

## When your truck is due

Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). You can test up to 90 days before a deadline. Free email reminders: https://ctcfinder.com/reminders/

## Frequently asked questions

### Does William Hunter offer mobile Clean Truck Check testing?

Yes. William Hunter says on CARB's tester list that it offers mobile testing, so it can come to your yard or job site. Ask about a trip fee when you call.

### Can William Hunter test a 2012 or older diesel truck?

Yes. William Hunter lists smoke opacity testing, the test CARB requires for diesel trucks of model year 2012 and older (no OBD). See [OBD vs smoke opacity](https://ctcfinder.com/guide/obd-vs-smoke-opacity-test/).

### How much does William Hunter charge for a Clean Truck Check?

William Hunter has not published prices with us; call (928) 920-8726 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the [cost guide](https://ctcfinder.com/guide/cost/).

### Is William Hunter a CARB-credentialed tester?

William Hunter appears on CARB's public Clean Truck Check tester list, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.

## Other testers nearby

- **[Southern Tire Mart 854](https://ctcfinder.com/tester/southern-tire-mart-854-yuma-az/)** — 3075 E Gila Ridge Rd #B, Yuma, AZ 85365 — (928) 798-8884 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Stmp](https://ctcfinder.com/tester/stmp-yuma-az/)** — 3075 b gila ridge rd 563 w patricia st, Yuma, AZ 85365 — (928) 798-6402 — 1 mi. Services: mobile testing, OBD testing.