DUI Laws in Wisconsin: 0.08% BAC Limit (2026)

By Alex Harmon · Updated June 2026

Key Penalty Facts at a Glance

Overview of Wisconsin OWI Law

Wisconsin law prohibits operating a motor vehicle with a blood alcohol concentration (BAC) of 0.08% or higher. For drivers under 21, the state enforces a lower threshold of 0.00% under its zero-tolerance provisions. Commercial drivers must remain below the federal 0.04% BAC standard regardless of state law.

Wisconsin Statute § 346.63 governs OWI (Operating While Intoxicated) offenses. Wisconsin is the only state in the country where a first-offense OWI is a civil infraction rather than a criminal offense — fines range from $150 to $300 with no jail time. From a second offense forward, OWI becomes a criminal misdemeanor or felony. License suspension is 6 to 9 months.

First-Offense OWI Penalties in Wisconsin

A first OWI conviction in Wisconsin carries the following consequences:

• Fine: $150–$300
• Jail time: No jail 1st offense
• License suspension: 6–9 months
• Ignition interlock device: Required

Wisconsin's unique first-offense civil status means a first OWI does not create a criminal record, but it still results in license suspension, points on driving record, and higher insurance rates. The state requires ignition interlock devices for repeat OWI offenders and high-BAC first offenders. Under-21 drivers face zero tolerance (0.00%). Wisconsin uses a 10-year lookback for prior OWI convictions. The state uses a PAC (Prohibited Alcohol Concentration) statute alongside the OWI statute.

Beyond these court-imposed penalties, a DUI arrest in Wisconsin will typically trigger an administrative license suspension through the state DMV — separate from the criminal case. This suspension begins shortly after arrest when a driver fails or refuses a chemical test. Drivers generally have a limited window (often 10–30 days) to request a hearing to contest the administrative suspension.

What Happens During a OWI Stop in Wisconsin?

During a OWI stop in Wisconsin, an officer who observes signs of impairment — bloodshot eyes, slurred speech, odor of alcohol — may ask you to perform standardized field sobriety tests (SFSTs). These include the Horizontal Gaze Nystagmus (HGN) test, the Walk-and-Turn test, and the One-Leg Stand test. If the officer determines there is probable cause, you will be asked to submit to a preliminary breath test (PBT) roadside, followed by an evidentiary breath or blood test at the station. Your right to remain silent applies — you are not obligated to answer questions beyond identifying yourself. However, refusing chemical testing triggers the implied consent suspension.

Ignition Interlock Device (IID) Requirements

An ignition interlock device (IID) is required for OWI convictions in Wisconsin. An IID is a breath-testing device installed in the vehicle that requires the driver to provide a clean breath sample before the engine will start. The device also performs rolling retests while driving. IID costs typically include installation ($70–$150), monthly monitoring fees ($60–$90), and removal costs. The IID requirement period varies based on offense history and BAC level.

CDL and Commercial Driver Rules

Commercial drivers operating in Wisconsin must adhere to the federal 0.04% BAC limit. A first OWI conviction results in a one-year CDL disqualification. A second DUI offense, or a first offense involving hazardous materials, triggers a lifetime CDL revocation. Commercial drivers cannot use the CDL Disqualification Petition for reinstatement after a second offense.

Implied Consent Law in Wisconsin

Like all 50 states, Wisconsin has an implied consent law. By operating a motor vehicle on public roads, drivers automatically consent to chemical testing (breath, blood, or urine) if lawfully arrested on suspicion of OWI. Refusal to submit to testing carries its own administrative consequences, including an automatic license suspension independent of the criminal case outcome. In some states, refusal can even be introduced as evidence of consciousness of guilt in the criminal proceeding.

Secondary Consequences of a OWI Conviction

Beyond the immediate legal penalties, a OWI conviction in Wisconsin carries significant secondary consequences. Auto insurance premiums can increase 50–100% or more, and many insurers require an SR-22 certificate of financial responsibility for three years post-conviction. Employment background checks will reveal a criminal conviction (for states where first-offense DUI is criminal). Certain professional licenses — nursing, law, commercial driving, teaching — may be affected. A OWI conviction can also affect custody arrangements, housing applications, and federal benefits eligibility.

• SR-22 insurance requirement for 3 years (major premium increases)
• Potential impact on professional licenses (nursing, law, CDL, real estate)
• Background check disclosure for employment applications
• Impact on custody and family law proceedings
• Possible federal consequences for federal employees or military personnel
• Increased scrutiny on future background checks for firearms purchases

Repeat Offense Escalation

Penalties in Wisconsin escalate significantly for repeat OWI offenders. A second offense within the state's lookback period typically results in longer mandatory jail sentences, higher fines, extended license revocation, and mandatory ignition interlock device installation. Three or more DUI offenses often trigger felony charges with state prison sentences rather than county jail. Repeat offenders may also face vehicle forfeiture in some circumstances.

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