What Is an OWI in Wisconsin? BAC Limits, Penalties, and Costs

An OWI in Wisconsin, short for Operating While Intoxicated, is the state’s impaired-driving offense. It covers more than drinking and driving: the charge applies to impairment from alcohol, illegal drugs, prescription medications, and even over-the-counter drugs that affect your ability to drive safely. Wisconsin also enforces a separate violation for simply having a blood alcohol concentration at or above the legal limit, whether or not your driving looked impaired.

What the Charge Actually Covers

An OWI rests on two elements: you were “operating” a motor vehicle, and you were “intoxicated” while doing so. Wisconsin defines both more broadly than most people expect.

“Operating” does not require the vehicle to be moving. Under the statute, it means physically activating any of the controls needed to put the vehicle in motion.¹ Starting the engine while parked, shifting into gear, or turning the steering wheel can all count. You do not need to have traveled a single foot. Wisconsin separately defines “driving” as exercising physical control over a vehicle’s speed and direction while it is in motion, and either action can support a charge.

“Intoxicated” reaches alcohol, controlled substances, their analogs, and any other drug that renders you unable to drive safely.¹ The substance does not need to be illegal. A prescribed painkiller, a sleep aid, or an antihistamine that makes you drowsy can support an OWI charge if it affected your driving. Wisconsin also prohibits operating with any detectable amount of a restricted controlled substance in your blood, so traces alone can be enough even without observable impairment.

The BAC Limits That Trigger a Charge

Wisconsin also enforces a separate violation called Prohibited Alcohol Concentration (PAC). The distinction matters: a PAC charge rests entirely on a chemical test result, with no need for the state to prove your driving was actually impaired. The thresholds depend on who you are:

General drivers 21 and over: BAC of 0.08 or higher.
Commercial motor vehicle operators: BAC of 0.04 or higher while operating a commercial vehicle.
Drivers under 21: any detectable amount of alcohol, under Wisconsin’s absolute sobriety rule.
Drivers with three or more prior OWI convictions: BAC above 0.02.

The lower limits for commercial drivers, underage drivers, and repeat offenders reflect Wisconsin’s judgment that those groups warrant tighter restrictions.²

Penalties by Offense Number

Wisconsin’s OWI penalties escalate sharply. The jump from a first offense to a second is the steepest, because the first is treated as a civil matter while the second becomes criminal.

First Offense

A first OWI with no aggravating factors is not a crime in Wisconsin. It is a civil forfeiture, similar to a traffic ticket, though the consequences run well past a speeding fine. Penalties include a fine between $150 and $300, plus a $435 OWI surcharge, and a license revocation of six to nine months.³ If your BAC was 0.15 or higher, you must install an ignition interlock device for one year.

The civil label misleads people. The offense still goes on your driving record, still triggers mandatory assessment, and still counts as a prior if you are ever charged again.

Second Offense

A second offense is a criminal misdemeanor. The court must impose at least five days in jail (up to six months), fines between $350 and $1,100 plus the $435 surcharge, and a license revocation of 12 to 18 months.³ An ignition interlock is required for one to two years. For a second offense to count, the prior OWI must have occurred within the previous ten years, or the person must have a prior conviction for homicide or great bodily harm by intoxicated use at any time during their life.

Third Offense

A third offense brings at least 45 days in jail (up to one year), fines from $600 to $2,000 plus the surcharge, and a license revocation of two to three years.³ The mandatory interlock period extends to one to three years.

Fourth Offense and Beyond

Starting at the fourth offense, Wisconsin classifies OWI as a felony. Penalties jump to potential prison time measured in years rather than days, and a fourth or subsequent conviction can result in a license revocation of up to a lifetime.⁴ The maximum imprisonment for a subsequent offense can reach six years. A felony conviction also triggers federal consequences, including a lifetime ban on possessing firearms under federal law, which prohibits gun ownership by anyone convicted of a crime punishable by more than one year in prison.⁵

Mandatory Assessment Every Conviction Triggers

Every OWI conviction in Wisconsin, including a first offense, triggers a mandatory Intoxicated Driver Program assessment. You must contact the approved assessment facility in your county within 72 hours of conviction.⁶ Based on the results, the facility creates a driver safety plan that may include education classes, outpatient treatment, or more intensive rehabilitation.

Ignoring the requirement has teeth. If you fail to schedule the assessment, miss your appointment, skip the treatment program, or get arrested for another OWI while in a plan, the state cancels your license entirely, including any occupational license you may have been granted during your revocation period.⁶ You must also complete the driver safety plan within one year of the assessment date.

Costs and Consequences Beyond the Sentence

Court-imposed penalties are only part of the cost. Several downstream consequences catch people off guard because nobody mentions them at the sentencing hearing.

Insurance and Out-of-Pocket Costs

Auto insurance premiums typically rise sharply after an OWI. Industry data suggests the average increase is roughly 88 percent, which can add hundreds of dollars per month. Wisconsin requires SR-22 proof of financial responsibility for license reinstatement, and insurers charge more for that filing. Add ignition interlock installation and monthly monitoring, which commonly run from several hundred to over a thousand dollars total, and the real cost of a first-offense OWI far exceeds the court fine. None of these costs are tax-deductible; federal tax law bars deducting fines and penalties paid to a government for violating any law.

Travel to Canada

Canada treats impaired driving as a serious criminal offense. Since December 2018, Canada’s maximum penalty for impaired driving is ten years, which means a single OWI conviction can make a U.S. citizen criminally inadmissible. For offenses after that date, the normal pathway of being “deemed rehabilitated” by the passage of time is no longer available. Entry generally requires either a Temporary Resident Permit or a formal Criminal Rehabilitation application, both of which involve fees, paperwork, and processing delays.

Firearm Rights

A first or second OWI does not directly affect gun rights, because those offenses are a civil forfeiture and a misdemeanor. From the fourth offense on, OWI becomes a felony, and federal law bars anyone convicted of a crime punishable by more than one year in prison from possessing firearms.⁵ That prohibition is permanent under federal law and applies regardless of whether the state later restores your civil rights.

A Child in the Vehicle Changes the Charge

Operating while intoxicated with a passenger under 16 years old is treated as a separate, more serious offense in Wisconsin. Penalties are steeper at every level, and the charge can push you toward felony territory faster. Treat it as a fundamentally different situation from a standard OWI and get legal help immediately.

What Happens at the Roadside

By operating a vehicle on Wisconsin roads, you have already consented to a chemical test of your breath, blood, or urine if an officer lawfully arrests you for suspected impaired driving. This is Wisconsin’s implied consent rule. You never sign anything agreeing to it; the act of driving triggers the obligation.

Refusing the test carries administrative penalties that exist independently of any OWI conviction. A first refusal results in a one-year license revocation and a required ignition interlock. Those consequences apply even if you are never found guilty of the underlying OWI charge. Repeated refusals lead to longer revocation periods.⁴

1
Wisconsin State Legislature. Wisconsin Statutes 346.63 – Operating Under Influence of Intoxicant or Other Drug
2
Wisconsin Department of Transportation. Drunk Driving Law
3
Wisconsin Department of Transportation. OWI and Related Alcohol and Drug Offense Penalties
4
Wisconsin Department of Transportation. Impaired Driving (OWI) in Wisconsin
5
United States Department of Justice. Summary of Federal Firearms Laws
6
Wisconsin Department of Transportation. OWI Assessment and Driver Safety Plan