Wisconsin DMV Official Government Site - Emission test
https://wisconsindot.gov/Pages/dmv/vehicles/rnew-plts/emissiontest.aspx
WebVehicles customarily kept in one of these seven southeastern Wisconsin counties require an emissions test: Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan, Washington and Waukesha. Do I need an emission test? Find an emission testing facility. NEW: Two testing-only facilities are now open! WIVIP North. 8718 W Brown Deer Rd. Brown Deer, WI 53224.
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