Sixty-five of Wisconsin’s 72 counties do not require vehicle emissions testing. Only seven southeastern counties mandate it: Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, and Waukesha.1Wisconsin Department of Transportation. Emission Test If your vehicle is customarily kept anywhere else in the state, you can renew your registration without ever visiting a testing station.
The 65 Wisconsin Counties With No Emissions Testing
Every county on the list below is outside the inspection program. Vehicles customarily kept in any of them skip emissions testing entirely and renew through the standard DMV process.
- Adams
- Ashland
- Barron
- Bayfield
- Brown
- Buffalo
- Burnett
- Calumet
- Chippewa
- Clark
- Columbia
- Crawford
- Dane
- Dodge
- Door
- Douglas
- Dunn
- Eau Claire
- Florence
- Fond du Lac
- Forest
- Grant
- Green
- Green Lake
- Iowa
- Iron
- Jackson
- Jefferson
- Juneau
- Kewaunee
- La Crosse
- Lafayette
- Langlade
- Lincoln
- Manitowoc
- Marathon
- Marinette
- Marquette
- Menominee
- Monroe
- Oconto
- Oneida
- Outagamie
- Pepin
- Pierce
- Polk
- Portage
- Price
- Richland
- Rock
- Rusk
- Sauk
- Sawyer
- Shawano
- St. Croix
- Taylor
- Trempealeau
- Vernon
- Vilas
- Walworth
- Washburn
- Waupaca
- Waushara
- Winnebago
- Wood
A few names on this list sit right next to counties that do require testing, which trips people up. Walworth borders Racine and Kenosha but is exempt. Dodge and Jefferson border Waukesha and are exempt. Fond du Lac borders Sheboygan and Washington and is exempt. Manitowoc borders Sheboygan and is exempt. Living near a tested county doesn’t pull you into the program.
How Wisconsin Decides Which County Counts for Your Vehicle
The rule follows the vehicle, not the owner. Wisconsin’s program applies to vehicles “customarily kept” in one of the seven designated counties, which means the usual parking location rather than your mailing address.1Wisconsin Department of Transportation. Emission Test A car garaged in Milwaukee needs testing even if its owner lives in Dane County. A car kept at a cabin in Vilas County doesn’t need testing even if its owner’s primary residence is in Waukesha.
That distinction matters most in two situations. The first is multiple-property households, where the honest answer about where the vehicle sits most nights decides the question. The second is moving. If you recently relocated from one of the seven counties to any of the 65 on the list above and updated your registration address, your next renewal won’t require an inspection. The reverse is also true: moving into Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, or Waukesha pulls your vehicle into the program.
Why the Program Is Limited to the Southeast
Wisconsin didn’t choose these seven counties arbitrarily. The 1990 amendments to the federal Clean Air Act require states to run vehicle inspection programs in areas the EPA designates as “nonattainment” for certain air pollutants.2US EPA. Vehicle Emissions Inspection and Maintenance General Information and Regulations Southeastern Wisconsin’s traffic volume and population density pushed ozone and particulate readings above those federal limits, triggering the mandate for the seven counties clustered along Lake Michigan.
Wisconsin Statutes section 110.20 authorizes the Department of Transportation to run the program in counties the Department of Natural Resources identifies under section 285.30 as falling within nonattainment areas.3Wisconsin State Legislature. Wisconsin Statutes 110.20 The statute also lets any county board voluntarily opt in by resolution, but no county outside the original seven has done so. For the 65 counties on the list above, that means the exemption has held steady and isn’t tied to anything you need to monitor at renewal time.
What “No Testing Required” Means at Renewal
If you’re in one of the 65 exempt counties, your renewal notice from WisDOT won’t include an emissions requirement, and you can renew online, by mail, at a DMV service center, or at a self-service kiosk without producing an inspection report. There’s nothing to schedule, nothing to pay for at a testing station, and no retesting process to worry about. The emissions program and its procedures (OBD-II scans, repair-and-retest rules, cost waivers) all live inside the seven-county zone.
One narrow situation to flag: if you buy a vehicle that was previously registered in one of the seven testing counties and move it to an exempt county, update the registration address so the DMV’s records reflect where the vehicle is actually kept. That keeps renewal notices accurate and avoids a testing prompt the vehicle no longer needs.
If You End Up in One of the Seven Testing Counties
For readers whose situation changes, the short version of what applies in Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, and Waukesha: testing covers gasoline, natural gas, and hybrid vehicles from model years 1996–2006 under 8,501 pounds GVWR, and diesel, gasoline, natural gas, and hybrid vehicles from 2007 and newer up to 14,000 pounds GVWR.1Wisconsin Department of Transportation. Emission Test Vehicles aren’t subject to testing until they reach four model years of age under Trans 131.03.4Wisconsin State Legislature. Wisconsin Administrative Code Trans 131.03(1) Pre-1996 vehicles, fully electric vehicles, and anything over the weight thresholds are exempt even inside the seven counties. Testing is otherwise required every other year at renewal, and within 45 days of a purchase, a title change, or a new-resident transfer from another state.
For everyone else, meaning the overwhelming majority of Wisconsin drivers, the answer stays simple: no county board action, no federal redesignation, and no change in where you keep your vehicle means no inspection at renewal.