---
title: "Derek Riley — Clean Truck Check, Hydesville, CA | CTC Finder"
description: "Derek Riley in Hydesville, CA 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/derek-riley-hydesville/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Derek Riley

Clean Truck Check tester in Hydesville, 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 | Hydesville, CA 95547 |
| County | Humboldt County |
| Phone | (707) 601-9116 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Derek Riley 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 Lynnette Tipple in Hydesville, about 1 mile away. [See listing](https://ctcfinder.com/tester/lynnette-tipple-hydesville/).

## Clean Truck Check testers in Humboldt County

Derek Riley 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.

## 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 Derek Riley offer mobile Clean Truck Check testing?

Yes. Derek Riley 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 Derek Riley test a 2012 or older diesel truck?

Derek Riley does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Lynnette Tipple](https://ctcfinder.com/tester/lynnette-tipple-hydesville/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Derek Riley charge for a Clean Truck Check?

Derek Riley has not published prices with us; call (707) 601-9116 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 Derek Riley a CARB-credentialed tester?

Derek Riley 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

- **[Lynnette Tipple](https://ctcfinder.com/tester/lynnette-tipple-hydesville/)** — Hydesville, CA 95547 — (707) 845-6181 — 1 mi. Services: OBD testing, smoke opacity (non-OBD) testing.
- **[Austin Will](https://ctcfinder.com/tester/austin-will-fortuna/)** — Fortuna, CA 95540 — (707) 768-3781 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Cody clean truck test](https://ctcfinder.com/tester/cody-clean-truck-test-fortuna/)** — 354 11th St, Fortuna, CA 95540 — (707) 617-8618 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Eri Marroquin](https://ctcfinder.com/tester/eri-marroquin-fortuna/)** — Fortuna, CA 95540 — (714) 380-2971 — 3 mi. Services: mobile testing, OBD testing.
- **[JACKSONS Mobile Welding and Equipment Repair](https://ctcfinder.com/tester/jacksons-mobile-welding-and-equipment-repair-fortuna/)** — 207 Rebecca Ln, Fortuna, CA 95540 — (707) 499-0877 — 3 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Johns' Group LLC](https://ctcfinder.com/tester/johns-group-llc-fortuna/)** — 3651 Rohnerville Rd, Fortuna, CA 95540 — (707) 725-3898 — 3 mi. Services: OBD testing, smoke opacity (non-OBD) testing.