---
title: "Hamilton Smoke Opacity Testing — Clean Truck Check, Dixon, CA"
description: "Hamilton Smoke Opacity Testing in Dixon, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, smoke opacity (non-OBD) testing…"
url: "https://ctcfinder.com/tester/hamilton-smoke-opacity-testing-dixon/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# Hamilton Smoke Opacity Testing

Clean Truck Check tester in Dixon, CA (Solano 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 | Dixon, CA 95620 |
| County | Solano County |
| Phone | (707) 718-4396 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | Yes |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks Hamilton Smoke Opacity Testing 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 Solano County

Hamilton Smoke Opacity Testing is one of 38 testing businesses in Solano County on CARB's public tester list. 34 of them offer mobile testing and 21 do smoke opacity tests. In Dixon itself there are 8 listed businesses, 6 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 Hamilton Smoke Opacity Testing offer mobile Clean Truck Check testing?

Yes. Hamilton Smoke Opacity Testing 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 Hamilton Smoke Opacity Testing test a 2012 or older diesel truck?

Yes. Hamilton Smoke Opacity Testing 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 Hamilton Smoke Opacity Testing charge for a Clean Truck Check?

Hamilton Smoke Opacity Testing has not published prices with us; call (707) 718-4396 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 Hamilton Smoke Opacity Testing a CARB-credentialed tester?

Hamilton Smoke Opacity Testing 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

- **[Charge](https://ctcfinder.com/tester/charge-dixon/)** — 6888 Tremont Rd, Dixon, CA 95620 — (915) 433-1657 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Credentialed tester in Dixon](https://ctcfinder.com/tester/credentialed-tester-in-dixon-dixon/)** — 255 Bowen Ln, Dixon, CA 95620 — (707) 640-0797 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing.
- **[DriveCity Lube and Smog](https://ctcfinder.com/tester/drivecity-lube-and-smog-dixon/)** — 2800 W A St, Dixon, CA 95620 — (707) 640-4967 — 1 mi. Services: not listed.
- **[Mike Lowrie Trucking, INC.](https://ctcfinder.com/tester/mike-lowrie-trucking-inc-dixon/)** — 8714 Sparling Ln, Dixon, CA 95620 — (707) 678-7575 — 1 mi. Services: not listed.
- **[Mobile CARB Testing](https://ctcfinder.com/tester/mobile-carb-testing-dixon/)** — Dixon, CA 95620 — (916) 538-7777 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Mustard's Mobile CTC](https://ctcfinder.com/tester/mustards-mobile-ctc-dixon/)** — 410 Vanderbilt Dr, Dixon, CA 95620 — (707) 685-5258 — 1 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.