---
title: "Justin Mumm — Clean Truck Check, Chehalis, WA | CTC Finder"
description: "Justin Mumm in Chehalis, WA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and nearby…"
url: "https://ctcfinder.com/tester/justin-mumm-chehalis-wa/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Justin Mumm

Clean Truck Check tester in Chehalis, WA.

> 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 | Chehalis, WA 98532 |
| Phone | (253) 388-4078 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Justin Mumm 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 | Not listed |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is AIRLIMITS Nationwide in Chehalis, about 1 mile away. [See listing](https://ctcfinder.com/tester/airlimits-nationwide-chehalis-wa/).

## Clean Truck Check testers in Washington

Justin Mumm is one of 17 testing businesses in Washington on CARB's public tester list. 11 of them offer mobile testing and 2 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 Justin Mumm offer mobile Clean Truck Check testing?

Yes. Justin Mumm 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 Justin Mumm test a 2012 or older diesel truck?

Justin Mumm does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [AIRLIMITS Nationwide](https://ctcfinder.com/tester/airlimits-nationwide-chehalis-wa/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Justin Mumm charge for a Clean Truck Check?

Justin Mumm has not published prices with us; call (253) 388-4078 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 Justin Mumm a CARB-credentialed tester?

Justin Mumm 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

- **[AIRLIMITS Nationwide](https://ctcfinder.com/tester/airlimits-nationwide-chehalis-wa/)** — Chehalis, WA 98532 — (800) 788-5241 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.