Wisconsin OWI Laws and Penalties: A Complete Guide

July 6, 2026

Wisconsin OWI laws and penalties guide

Wisconsin's OWI laws are some of the most complex in the country. Unlike most states, Wisconsin treats a first-offense OWI as a civil forfeiture rather than a criminal offense. But don't let that fool you — the penalties are still serious, and they escalate quickly for repeat offenses.

BAC Limits in Wisconsin

Wisconsin sets different BAC limits depending on the type of driver:

  • .08% — Regular drivers (21 and over)
  • .02% — Underage drivers (under 21)
  • .04% — Commercial drivers
  • .00% — Drivers on OWI-related probation or with an ignition interlock requirement

Penalty Tiers for OWI in Wisconsin

First Offense OWI

A first-offense OWI is a civil forfeiture, not a criminal charge. Penalties include:

  • Fine: $150–$300 plus court costs (total typically $800–$1,000)
  • License suspension: 6–9 months
  • Driver safety plan completion required
  • Ignition interlock required if BAC was .15% or higher
  • Possible jail time (up to 6 months) if aggravating factors exist

Second Offense OWI

A second offense within 10 years is a criminal misdemeanor:

  • Fine: $350–$1,100 plus costs
  • License revocation: 12–18 months
  • Mandatory jail: 5 days minimum, up to 6 months
  • Ignition interlock required
  • SR-22 insurance required for 3 years

Third Offense OWI

A third offense within 10 years is a criminal misdemeanor with escalating penalties:

  • Fine: $600–$2,000 plus costs
  • License revocation: 24–36 months
  • Mandatory jail: 30 days minimum, up to 1 year
  • Ignition interlock required
  • Possible vehicle forfeiture

Fourth and Subsequent Offenses

A fourth OWI within 10 years is a Class H felony:

  • Fine: $600–$10,000 plus costs
  • License revocation: 3+ years
  • Mandatory prison: 60 days minimum, up to 6 years
  • Felony record with permanent consequences

Wisconsin's 10-Year Lookback Period

Wisconsin uses a 10-year lookback period for OWI offenses. This means prior OWI convictions within the last 10 years count toward escalating penalties. The lookback is calculated from the date of the current offense, not the date of conviction.

Enhanced Penalties

Certain factors can enhance OWI penalties beyond the standard ranges:

  • High BAC (.15% or higher) — Mandatory ignition interlock, higher fines
  • Minor in the vehicle — Additional penalties for child endangerment
  • Accident with injury — Potential felony charges for injury by OWI
  • Homicide — Felony charges with up to 25+ years in prison

Need Help Understanding Your Case?

Every OWI case is different. The specific facts of your arrest, your prior record, and the county where you were charged all affect the potential penalties. Call us at (608) 535-6554 for a free, confidential consultation.