Derek Riley

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

Derek Riley appears on CARB's public list of credentialed Clean Truck Check testers. It lists mobile testing, OBD testing, motorhome testing. Mobile testing means the tester can come to your yard or job site.

Location
Hydesville, CA 95547
County
Humboldt County
Phone
(707) 601-9116
Mobile testing
Yes — comes to your yard
OBD testing
Yes
Smoke opacity (non-OBD)
No
Motorhomes
Yes
Credentialed testers
1
Last verified

Call (707) 601-9116 Open in Google Maps

The street address is not published for this listing (mobile or home-based tester). Call to arrange the test.

Before you call

  • Have your VIN, odometer reading and plate number ready.
  • Your vehicle must be registered in CTC-VIS and the annual compliance fee paid; the tester submits the result to CARB.
  • Ask for the price per vehicle and any mobile trip fee. Typical published prices for an OBD test are $50–$135 per vehicle (see cost guide).

Which trucks Derek Riley can test

The test CARB requires depends on the engine's fuel and model year. Based on the services Derek Riley lists on CARB's tester list:

Your vehicleTest requiredThis tester
Diesel, model year 2013 or newerOBD scanYes
Alternative fuel (natural gas, propane), 2018 or newerOBD scanYes
Diesel, model year 2012 or older (no OBD)Smoke opacity test (SAE J1667) plus visual inspectionNot listed
California-registered motorhomeSame test as above by engine year, once a yearYes

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.

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. All testers in Humboldt County.

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. You can test up to 90 days before a deadline. Get a free email reminder before each one.

How to check a tester's credential

CARB publishes its Clean Truck Check tester list, where Derek Riley appears as of November 1, 2026. Listing there is optional, so a missing name does not always mean a tester is not credentialed. After the test, check that the passing result shows for your vehicle in CTC-VIS; that is what counts for compliance.

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 (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.

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 near Hydesville

Source: CARB's public Clean Truck Check tester list, last checked . Listing on CARB's list is optional for testers, so some credentialed testers are not shown. Services, hours and prices change; please confirm with the tester before you go. Something wrong? Send a correction.

Call (707) 601-9116