How to find an emissions testing station in Wisconsin
Wisconsin emissions testing is run by the Department of Natural Resources (DNR), and you can find authorized test stations through their official website at dnr.wi.gov. The site has a searchable database where you enter your county or ZIP code and see every station near you that performs the test your vehicle needs. Each listing shows the station's address, phone number, and hours.
Not every repair shop or inspection station does emissions testing, so using the DNR database saves you from calling around. The database is updated regularly, but if you find a station listed that has closed, you can report it to the DNR so they can remove it.
You can also call the DNR directly at 608-266-2621 to ask for stations in your area, though the online search is faster if you have internet access.
Key Takeaways
- The Wisconsin DNR maintains the official list of authorized emissions testing stations on dnr.wi.gov, searchable by county or ZIP code.
- Independent repair shops, dealerships, and dedicated inspection stations all perform emissions tests, but only those certified by the DNR will be listed in the database.
- Testing costs vary by station and vehicle type, typically ranging from $15 to $50, and you should call ahead to confirm the station tests your specific vehicle model year.
- You must bring your vehicle registration and a valid photo ID to the test, and the station will need your vehicle identification number (VIN).
- If your vehicle fails the test, you have 30 days to repair it and retest at no additional charge at the same station.
What types of stations perform emissions testing
Wisconsin has three main categories of places where you can get tested. Independent repair shops certified by the DNR make up the largest group—these are local mechanics who have passed training and equipment standards. Dealerships also perform emissions tests, usually in their service departments, and they test vehicles of any make, not just their brand. Dedicated inspection stations exist in some areas and do nothing but emissions and safety inspections.
All three types must be on the DNR's authorized list to perform the test legally. A station's certification covers specific vehicle types—some test only gasoline vehicles, others test diesel, and some test both. When you find a station, confirm it tests your vehicle type and model year before you drive there.
What to bring and what to expect during testing
Bring your vehicle registration and a valid photo ID. The technician will need your vehicle identification number (VIN), which is on your registration and on the dashboard at the base of the windshield on the driver's side. Have your odometer reading available as well, though the technician can read it from your vehicle.
The test itself takes 10 to 20 minutes. The technician will connect a probe to your vehicle's tailpipe and measure emissions while the engine runs at idle and at a higher RPM. For 1996 and newer vehicles, the technician may also plug a scanner into your onboard diagnostic port to read your vehicle's emissions system data. Older vehicles may undergo a different test procedure.
You will receive a printed result when ready. A pass means your vehicle meets Wisconsin standards. A fail means you have 30 days to repair the problem and return to the same station for a retest at no charge.
Cost and payment methods
Emissions testing fees in Wisconsin range from about $15 to $50 depending on the station and your vehicle type. Diesel vehicles sometimes cost more to test than gasoline vehicles. Call ahead to ask the specific price for your vehicle, as stations set their own fees within state guidelines.
Most stations accept cash and card payments. Some may require payment at the time of testing, while others bill you after. Ask when you call to schedule or arrive for a walk-in test.
What to do if your vehicle fails the test
A failure means your vehicle's emissions are above Wisconsin limits. The test report will show which emissions system is the problem—usually the catalytic converter, oxygen sensors, fuel injectors, or the engine control computer. This information helps a repair shop diagnose what needs fixing.
You have 30 days from the test date to repair your vehicle and return to the same station for a retest. The retest is free. If you repair your vehicle at a different shop than where you tested, bring the test report with you so the repair shop knows what the test found. If you cannot repair the vehicle within 30 days, you can request a waiver from the DNR, though waivers are granted only in specific circumstances such as waiting for parts or a major repair.
Emissions testing requirements by vehicle age and type
Wisconsin requires emissions testing for most vehicles, but the rules depend on when your vehicle was made and what fuel it uses. Vehicles from 1968 and newer must be tested if they are registered in Wisconsin and are not exempt. Gasoline vehicles, diesel vehicles, and hybrid vehicles all have testing requirements, though the specific test procedure may differ.
Some vehicles are exempt from testing: vehicles over 25 years old, vehicles registered as antiques or classics, and certain government and fleet vehicles. Check your vehicle's registration or call the DNR to confirm whether your vehicle needs testing. If you are unsure, the authorized station can tell you when you call.
How often you need to be tested
Wisconsin requires emissions testing every two years for most vehicles. Your test is valid for two years from the date you pass. When your two years are up, you must test again before your vehicle registration expires. Some counties or municipalities may have different rules, so check your local requirements.
If you move to Wisconsin from another state, you will need to pass an emissions test before you can register your vehicle in Wisconsin, even if your vehicle was recently tested in your previous state.
Frequently Asked Questions
Can I test my vehicle at any station on the DNR list?
Yes. All authorized stations perform the same test and use the same standards. You can choose based on location, hours, or price. If you fail and need a retest, you must return to the same station where you failed, but the retest is free.
What if the station I want to use is closed or no longer tests vehicles?
Use the DNR database to find another authorized station near you. If you find a station listed that has closed, report it to the DNR at dnr.wi.gov so they can update the list. You can also call 608-266-2621 for help finding an open station.
Do I need an appointment or can I just walk in?
Most stations accept both appointments and walk-ins, but call ahead to ask. Some stations get busy during certain times of year, especially near registration important date, so an appointment may save you wait time.
What happens if I fail the test and cannot afford the repair?
You have 30 days to repair your vehicle. If you cannot complete the repair in that time, contact the DNR about a waiver. Waivers are not automatic, but the DNR may grant one if you can show you are making a good-faith effort to repair the vehicle or if the repair is delayed by parts availability.
Can I test a vehicle I just bought if it has an out-of-state registration?
No. You must register the vehicle in Wisconsin first. Once registered, you can then take it for an emissions test. If the vehicle fails, you have 30 days to repair it before your registration becomes invalid.