---
title: "Darrell Purdy — Clean Truck Check, Denair, CA | CTC Finder"
description: "Darrell Purdy in Denair, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing. Phone, address and nearby testers."
url: "https://ctcfinder.com/tester/darrell-purdy-denair/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Darrell Purdy

Clean Truck Check tester in Denair, CA (Stanislaus 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 | Denair, CA 95316 |
| County | Stanislaus County |
| Phone | (209) 968-5630 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | No |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Darrell Purdy 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 | Not listed |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Andy Rutherford in Denair, about 1 mile away. [See listing](https://ctcfinder.com/tester/andy-rutherford-denair/).

## Clean Truck Check testers in Stanislaus County

Darrell Purdy is one of 53 testing businesses in Stanislaus County on CARB's public tester list. 47 of them offer mobile testing and 22 do smoke opacity tests. In Denair 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 Darrell Purdy offer mobile Clean Truck Check testing?

Yes. Darrell Purdy 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 Darrell Purdy test a 2012 or older diesel truck?

Darrell Purdy does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Andy Rutherford](https://ctcfinder.com/tester/andy-rutherford-denair/) (about 1 mile). Trucks from 2013 on get an OBD scan instead.

### How much does Darrell Purdy charge for a Clean Truck Check?

Darrell Purdy has not published prices with us; call (209) 968-5630 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 Darrell Purdy a CARB-credentialed tester?

Darrell Purdy 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

- **[Adrian Martinez](https://ctcfinder.com/tester/adrian-martinez-denair/)** — Denair, CA 95316 — (209) 535-8834 — 1 mi. Services: mobile testing, OBD testing.
- **[Andy Rutherford](https://ctcfinder.com/tester/andy-rutherford-denair/)** — Denair, CA 95316 — (209) 605-0970 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[JDS Transportation Services LLC](https://ctcfinder.com/tester/jds-transportation-services-llc-denair/)** — 4716 Brandi Way, Denair, CA 95316 — (209) 859-1951 — 1 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Dan's CTC](https://ctcfinder.com/tester/dans-ctc-winton/)** — 6760 California St, Winton, CA 95388 — (209) 564-1633 — 9 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Taylor's](https://ctcfinder.com/tester/taylors-winton/)** — 6171 N Winton Way, Winton, CA 95388 — (209) 261-1048 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Hargreaves Ranches LLC](https://ctcfinder.com/tester/hargreaves-ranches-llc-delhi/)** — 17736 Swanson Rd, Delhi, CA 95315 — (209) 988-7214 — 10 mi. Services: mobile testing, OBD testing.