Which Texas Counties Require Emissions Testing? (2026 List)
17 Texas counties currently require an annual emissions test before you can register a vehicle: Brazoria, Collin, Dallas, Denton, El Paso, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Montgomery, Parker, Rockwall, Tarrant, Travis, and Williamson. Bexar County joins on November 1, 2026, making 18. If you're outside these counties, you don't need an emissions test — and since January 1, 2025, nobody in Texas needs the old safety inspection either, unless they're driving a commercial vehicle.
Texas has two separate vehicle inspection questions that get mixed up constantly: do you need a safety inspection, and do you need an emissions test? The safety inspection answer is now simple — almost nobody needs one anymore. The emissions answer depends entirely on which county your car is registered in. Here's the full list and everything that goes with it.
The Full List of Texas Counties That Require Emissions Testing
These counties are grouped around Texas's biggest metro areas — Houston, Dallas-Fort Worth, Austin, and El Paso — because that's where vehicle emissions have the biggest impact on air quality.
- Collin
- Dallas
- Denton
- Ellis
- Johnson
- Kaufman
- Parker
- Rockwall
- Tarrant
- Brazoria
- Fort Bend
- Galveston
- Harris
- Montgomery
- Travis
- Williamson
- El Paso
San Antonio's Bexar County will become the 18th emissions county. If your registration renewal falls before November 1, 2026, the old rules apply. If it falls on or after that date, you'll need a passing emissions test first.
Why These Specific Counties
This isn't random — it follows federal air quality law. Under the Clean Air Act, regions that don't meet national air quality standards for ozone pollution have to take action, and vehicle emissions testing is one of the tools states use to do that.
The rollout happened in stages over more than two decades:
- May 2002: Collin, Dallas, Denton, Harris, and Tarrant counties started testing
- May 2003: Brazoria, Ellis, Fort Bend, Galveston, Johnson, Kaufman, Montgomery, Parker, and Rockwall joined
- September 2005: Travis and Williamson counties were added
- January 2007: El Paso County joined
- November 2026: Bexar County is set to join, the first new addition in nearly 20 years
Which Vehicles Actually Need the Test
Living in one of these counties doesn't automatically mean every vehicle you own needs testing. The requirement is specific.
- Gasoline-powered vehicles, model years 2 through 24 years old — this is the core rule. A brand-new car and a car older than 24 years are both exempt
- 1996 and newer vehicles are tested using the OBD (onboard diagnostics) method — basically, the inspection station plugs into your car's computer and reads its emissions monitoring system
- Diesel vehicles are exempt
- Motorcycles are exempt
- Electric vehicles are exempt — there's nothing to test since there's no tailpipe emissions
- Hybrids are not automatically exempt. If a hybrid runs on gasoline at all, it's still subject to testing the same as a standard gas vehicle
How Much a Texas Emissions Test Costs
The fee is capped by the state, so it doesn't vary wildly between inspection stations.
| Fee | Amount | Paid To |
|---|---|---|
| OBD emissions inspection | Up to $11.50 | The inspection station, directly |
| State administration fee | $2.50 | Collected at registration, not at the inspection station |
| Bexar County emissions test (starting Nov 2026) | $18.50 | The inspection station, directly |
This is separate from the $7.50 Inspection Program Replacement Fee (or $16.75 for new vehicles) that everyone in Texas pays at registration, regardless of county.
The emissions test fee goes to the inspection station when you get tested. The Inspection Program Replacement Fee goes to the state when you register your vehicle, and everyone in Texas pays that one — emissions county or not. They're not the same charge.
What Happens If Your Vehicle Fails
A failed test isn't the end of the road. The inspection station gives you a report showing exactly what didn't pass, so you know what to bring to a mechanic. The most common culprit is a check engine light — even something minor like a loose gas cap can trigger it and cause an automatic fail.
Once repairs are done, you go back to the same station for a free retest within the allowed window. If your vehicle still doesn't pass and the needed repairs are expensive, Texas offers waivers and time extensions for eligible low-income vehicle owners — usually a one-time 30-day extension to get repairs done without risking an expired registration in the meantime.
How This Connects to Your Registration
If you're in an emissions county, you literally cannot renew your registration without a passing test on file. The inspection station uploads your results electronically, and your county tax office checks for that record before processing your renewal. If your registration renewal notice has a "TCEQ - EMISSIONS PRGM NON-COMPLIANCE" remark printed on it, that's your sign the test hasn't been completed or recorded yet.
For the full renewal process and all the other fees involved, see our Texas Vehicle Registration Renewal Guide.
Frequently Asked Questions
17 counties currently: Brazoria, Collin, Dallas, Denton, El Paso, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Montgomery, Parker, Rockwall, Tarrant, Travis, and Williamson. Bexar County joins starting November 1, 2026, making it 18.
No. If your vehicle is registered outside the 17 (soon 18) emissions counties, no emissions test is required. You also don't need a safety inspection anymore — that requirement was eliminated for non-commercial vehicles statewide on January 1, 2025.
Up to $11.50 for the test itself in most counties, plus a separate $2.50 state administration fee collected at registration time. Bexar County's test will cost $18.50 once it begins in November 2026.
Gasoline vehicles between 2 and 24 years old, registered in an emissions county. Vehicles from model year 1996 onward use the OBD test method. Diesel vehicles, motorcycles, and electric vehicles are exempt. Gas-burning hybrids are not exempt.
Starting November 1, 2026, vehicles registered in Bexar County won't be able to renew registration without a passing emissions test, using the same age and fuel-type rules as the other 17 counties. The test there is priced at $18.50.
Use the DPS station locator to find emissions testing near you.
For informational purposes only. Always verify current requirements at tceq.texas.gov and dps.texas.gov. Information verified against official TCEQ and DPS sources as of May 2026.