In Wisconsin, a drunk driving arrest is classified by a BAC (blood alcohol concentration) of .08% or greater and is referred to as a DUI (driving under the influence) or a OWI (operating while impaired). These arrests are taken very seriously in the state of Wisconsin and violators will suffer harsh fines, penalties and punishments. Legal limit in Wisconsin: Standard, non-commercial drivers: .08% BAC Commercial drivers: .04% BAC Drivers under 21: .02% BAC Penalties, Fines, & Suspension Wisconsin DUI & OWI Penalties, Fines, &