---
title: "Northern Humboldt Union High School Districts — Clean Truck Check, Arcata, CA"
description: "Northern Humboldt Union High School Districts in Arcata, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity…"
url: "https://ctcfinder.com/tester/northern-humboldt-union-high-school-districts-arcata/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Northern Humboldt Union High School Districts

Clean Truck Check tester in Arcata, CA (Humboldt County).

> 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 | 3701 Boyd Rd, Arcata, CA 95521 |
| County | Humboldt County |
| Phone | (707) 679-8111 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Northern Humboldt Union High School Districts 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 Humboldt County

Northern Humboldt Union High School Districts is one of 20 testing businesses in Humboldt County on CARB's public tester list. 16 of them offer mobile testing and 13 do smoke opacity tests. In Arcata itself there are 4 listed businesses, 4 of them mobile.

## 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 Northern Humboldt Union High School Districts offer mobile Clean Truck Check testing?

Yes. Northern Humboldt Union High School Districts 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 Northern Humboldt Union High School Districts test a 2012 or older diesel truck?

Yes. Northern Humboldt Union High School Districts 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 Northern Humboldt Union High School Districts charge for a Clean Truck Check?

Northern Humboldt Union High School Districts has not published prices with us; call (707) 679-8111 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 Northern Humboldt Union High School Districts a CARB-credentialed tester?

Northern Humboldt Union High School Districts 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

- **[Cummins](https://ctcfinder.com/tester/cummins-arcata/)** — 5150 BOYD ROAD, Arcata, CA 95521 — (707) 822-7390 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jason Fredrickson](https://ctcfinder.com/tester/jason-fredrickson-arcata/)** — Arcata, CA 95521 — (707) 672-4181 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[Seth David Mitouer](https://ctcfinder.com/tester/seth-david-mitouer-arcata/)** — Arcata, CA 95521 — (707) 292-2660 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Coast Counties Peterbilt](https://ctcfinder.com/tester/coast-counties-peterbilt-eureka/)** — 2660 Jacobs Ave, Eureka, CA 95501 — (707) 599-7531 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Dan Nordstrom](https://ctcfinder.com/tester/dan-nordstrom-eureka/)** — Eureka, CA 95501 — (707) 845-6772 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Weburg Mobile Diesel LLC](https://ctcfinder.com/tester/weburg-mobile-diesel-llc-eureka/)** — 1817 2nd St, Eureka, CA 95501 — (707) 243-3308 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.