Wisconsin DWI & DUI Laws
BAC limits, penalties, license suspension periods, and ignition interlock requirements for Wisconsin drivers.
State Guide
Wisconsin OWI Laws at a Glance
Impaired driving is prosecuted under OWI in Wisconsin, with a 0.08% BAC threshold. The penalty structure that follows a conviction (license suspension, interlock requirements, how prior offenses are counted) is entirely state-specific.
| Detail | Wisconsin Rule | Notes |
|---|---|---|
| Statutory Term | OWI | The specific offense name and code section vary by state |
| Standard BAC Limit | 0.08% | The standard threshold used in nearly every state |
| First-Offense License Suspension | 6 months | Administrative and criminal suspensions can run separately; actual length depends on case specifics |
| Ignition Interlock Device | Not mandatory | Not mandatory statewide, though a court may still order one |
| Lookback Period | Not consistently published | Confirm the current lookback window against state code. This figure is not consistently published across states |
How BAC Testing and Implied Consent Work
Like every state, Wisconsin relies on implied consent: operating a vehicle on public roads means you've consented to BAC testing if lawfully arrested for suspected impairment. Refusing that test comes with its own separate consequence, usually an automatic license suspension, regardless of how the OWI charge itself is resolved.
License Suspension: Two Separate Tracks
Many states run two separate proceedings after a OWI arrest: an administrative license suspension handled by the state's motor vehicle agency (which can take effect within days of arrest, independent of the criminal case) and the criminal case itself. Wisconsin's first-offense suspension period is 6 months.
Common Questions
Frequently Asked Questions: OWI in Wisconsin
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What is the BAC limit in Wisconsin?Wisconsin's standard illegal BAC threshold is 0.08%. This matches the standard used in nearly every U.S. state. Commercial drivers and drivers under 21 face lower thresholds in every state, including Wisconsin.
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How long is a license suspended for a first OWI offense in Wisconsin?Wisconsin's first-offense suspension period is generally 6 months. This can involve both an administrative suspension (handled by the state's motor vehicle agency, often starting soon after arrest) and consequences tied to the criminal case itself, which can run on a different timeline.
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Does Wisconsin require an ignition interlock device?In Wisconsin, an ignition interlock device is not mandatory statewide, though a court may still order one. Requirements can also depend on whether a high BAC was involved or whether it's a repeat offense.
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What does "OWI" mean in Wisconsin?OWI is Wisconsin's statutory term for operating a vehicle while impaired by alcohol or drugs above the legal threshold. Different states use different terms (DUI, DWI, OWI, OUI, OVI, and others) for what is fundamentally the same category of offense, though the exact legal definitions and penalty structures differ by state.
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What happens if I refuse a BAC test in Wisconsin?Like every state, Wisconsin has an implied consent law: refusing a lawfully requested BAC test after a OWI arrest triggers its own penalty, typically an automatic license suspension, separate from and in addition to any penalty from the underlying charge itself.
Sources & References
- National Highway Traffic Safety Administration, Drunk Driving official program overview
- Insurance Institute for Highway Safety, Alcohol Interlock Laws by State
- Wisconsin BAC limit, suspension period, and interlock requirement figures compiled from published state-by-state legal reference tables; confirm current figures against official WI state code before relying on them
- Governors Highway Safety Association, Alcohol-Impaired Driving State Laws