DUI Basics
What Does OWI Mean?
What Does OWI Mean?
OWI meaning: operating while intoxicated, the name Indiana, Iowa, Michigan and Wisconsin use for what other states call DUI or DWI. Ohio's version is OVI and Maine and Massachusetts use OUI. The word "operating" matters: in some of these states it covers being in control of a vehicle, not only driving it, and the law can reach parking lots. Find your state's rules on the state list.
OWI stands for operating while intoxicated. It is the name a handful of states give to the offense most people know as DUI. If your citation or court paperwork says OWI, you were charged under one of those states’ laws, and the rules that matter are that state’s.
The name tells you one useful thing: the law is built around operating a vehicle, not only driving it. In some OWI states that word reaches further than you might expect, and that is what this guide explains.
OWI Meaning: Operating While Intoxicated
An OWI charge means the state says you operated a motor vehicle while alcohol or drugs affected you, or with an alcohol concentration at or over the legal limit. Like DUI, it usually has two forms:
- Under the influence: alcohol, drugs or both affected your ability to drive.
- Per se: your test result was at or above the limit, however you seemed.
Iowa’s statute shows how wide an OWI law can be. It covers operating while under the influence of alcohol or another drug, operating with an alcohol concentration of .08 or more, and operating with any amount of a controlled substance in your blood or urine (Iowa Code § 321J.2). Wisconsin splits the per se version into its own label, PAC, for prohibited alcohol concentration. Michigan adds a second, lower charge called OWVI for operating while visibly impaired (Mich. Comp. Laws § 257.625).
Which States Use OWI, OVI and OUI
Of the 51 jurisdictions (50 states and DC), 8 build the main offense name around operating rather than driving. Four say OWI, two say OUI, Ohio says OVI and Hawaii says OVUII.
| State | Main term | What the letters stand for | Statute |
|---|---|---|---|
| Indiana | OWI | Operating a vehicle while intoxicated | IC 9-30-5 |
| Iowa | OWI | Operating while intoxicated | Iowa Code § 321J.2 |
| Michigan | OWI | Operating while intoxicated | MCL 257.625 |
| Wisconsin | OWI | Operating while intoxicated | Wis. Stat. § 346.63 |
| Ohio | OVI | Operating a vehicle under the influence | Ohio Rev. Code § 4511.19 |
| Maine | OUI | Operating under the influence | 29-A M.R.S. § 2411 |
| Massachusetts | OUI | Operating under the influence | M.G.L. c. 90, § 24 |
| Hawaii | OVUII | Operating a vehicle under the influence of an intoxicant | Haw. Rev. Stat. § 291E-61 |
A few other places use an operating term as a second name. DC lists OWI, operating while impaired, alongside DUI. Louisiana lists OWI, operating a vehicle while impaired, alongside its main DWI. Connecticut lists OUI alongside DUI.
What “Operating” Covers
“Operating” is the word that sets these laws apart. Each state defines it for itself, and the definitions differ in ways that can decide a case.
Michigan: Actual Physical Control
Michigan defines “operate” as being in actual physical control of a vehicle. It also covers causing an automated vehicle to move under its own power in automatic mode, whether or not you are physically inside (Mich. Comp. Laws § 257.35a). So in Michigan the question is control of the vehicle, not only whether the wheels turned while your hands were on the steering wheel.
Wisconsin: Drive or Operate
Wisconsin’s law bars anyone from driving or operating a motor vehicle while under the influence or over the limit (Wis. Stat. § 346.63). Its traffic code defines an “operator” as a person who drives or is in actual physical control of a vehicle (Wis. Stat. § 340.01(41)).
Ohio: Movement, Plus a Separate Control Offense
Ohio draws a sharper line. To “operate” means to cause or have caused movement of a vehicle (Ohio Rev. Code § 4511.01). Under that definition, operating requires movement. Sitting behind the wheel of a parked car is covered by a separate charge instead: having physical control of a vehicle while under the influence, defined as being in the driver’s seat with the ignition key or other ignition device in your possession. That offense is a first-degree misdemeanor of its own (Ohio Rev. Code § 4511.194).
| Question | Michigan | Wisconsin | Ohio |
|---|---|---|---|
| What counts as operating | Actual physical control | Driving, or actual physical control (as an operator) | Causing movement |
| Parked in the driver’s seat with the key | Can be operating if you had actual physical control | Can be operating if you had actual physical control | A separate physical-control offense |
Maine: Operating Under the Influence
Maine’s OUI law makes it a crime to operate a motor vehicle while under the influence of intoxicants, or with an alcohol level of 0.08 grams or more per 100 milliliters of blood or 210 liters of breath (29-A M.R.S. § 2411). The statute labels a violation a Class D crime and a strict liability crime, which means the state does not have to prove a culpable state of mind (17-A M.R.S. § 34). A first OUI in Maine also brings a 150-day court-ordered license suspension, on top of whatever the state’s licensing agency does.
Other DUI states reach the same ground with different words. North Dakota and Oklahoma name an offense of actual physical control, and Washington has a physical control offense. Whether your facts fit your state’s definition is a question for a lawyer licensed there.
What the State Calls It by State
| State | What the state calls it |
|---|---|
| DUI law in Alabama | DUI |
| DUI law in Alaska | DUI, Minor operating a vehicle after consuming alcohol (under 21) |
| DUI law in Arizona | DUI, Extreme DUI (0.15 or more), Aggravated DUI (felony) |
| DWI law in Arkansas | DWI, Underage DUI (under 21), BWI (boating while intoxicated) |
| DUI law in California | DUI |
| DUI law in Colorado | DUI, DWAI (driving while ability impaired), DUI per se, UDD (underage drinking and driving) |
| DUI law in Connecticut | DUI, OUI (operating under the influence), DWI |
| DUI law in Delaware | DUI |
| DUI law in District of Columbia | DUI, OWI (operating while impaired) |
| DUI law in Florida | DUI, driving under the influence, DUI manslaughter (when a death results) |
| DUI law in Georgia | DUI, driving under the influence, endangering a child by driving under the influence (child under 14 in the vehicle) |
| OVUII law in Hawaii | OVUII, operating a vehicle under the influence of an intoxicant, habitually operating a vehicle under the influence of an intoxicant (felony), operating a vehicle after consuming a measurable amount of alcohol (under 21) |
| DUI law in Idaho | DUI, driving under the influence of alcohol, drugs or any other intoxicating substances, aggravated DUI (felony, injury), excessive alcohol concentration (0.20 or more) |
| DUI law in Illinois | DUI, aggravated DUI (felony), statutory summary suspension (administrative) |
| OWI law in Indiana | OWI, operating a vehicle while intoxicated, operating with an ACE (alcohol concentration equivalent) of 0.08 or more |
| OWI law in Iowa | OWI, operating while intoxicated, zero tolerance revocation (under 21) |
| DUI law in Kansas | DUI |
| DUI law in Kentucky | DUI |
| DWI law in Louisiana | DWI, OWI (operating a vehicle while impaired), underage operating while impaired |
| OUI law in Maine | OUI, operating under the influence of intoxicants, operating with an excessive alcohol level |
| DUI law in Maryland | DUI, DWI (driving while impaired by alcohol), driving while impaired by drugs or a controlled dangerous substance |
| OUI law in Massachusetts | OUI, operating under the influence, OUI-drugs (marijuana, narcotic drugs, depressants or stimulants) |
| OWI law in Michigan | OWI, OWVI (operating while visibly impaired), UBAC (under 21, any bodily alcohol content) |
| DWI law in Minnesota | DWI, driving while impaired, underage drinking and driving (under 21) |
| DUI law in Mississippi | DUI, Zero Tolerance for Minors (under 21), Aggravated DUI |
| DWI law in Missouri | DWI, BAC (driving with excessive blood alcohol content) |
| DUI law in Montana | DUI, aggravated DUI |
| DUI law in Nebraska | DUI |
| DUI law in Nevada | DUI |
| DWI law in New Hampshire | DWI, Aggravated DWI |
| DWI law in New Jersey | DWI, DUI |
| DWI law in New Mexico | DWI, DUI, Aggravated DWI |
| DWI law in New York | DWI, DWAI (driving while ability impaired), Aggravated DWI, Zero Tolerance (under 21) |
| DWI law in North Carolina | DWI, impaired driving, habitual impaired driving (felony) |
| DUI law in North Dakota | DUI, APC (actual physical control) |
| OVI law in Ohio | OVI, OVUAC (operating a vehicle after underage alcohol consumption, under 21) |
| DUI law in Oklahoma | DUI, APC (actual physical control), DWI (driving while impaired, 47 O.S. § 761) |
| DUII law in Oregon | DUII, driving while under the influence of intoxicants |
| DUI law in Pennsylvania | DUI |
| DUI law in Rhode Island | DUI, driving under the influence of liquor or drugs, driving while impaired (ages 18 to 20, BAC 0.02 to under 0.08), refusal to submit to chemical test |
| DUI law in South Carolina | DUI, DUAC (driving with an unlawful alcohol concentration), felony DUI |
| DUI law in South Dakota | DUI, driving under the influence, underage drinking and driving (under 21, SDCL 32-23-21) |
| DUI law in Tennessee | DUI, driving under the influence, underage driving while impaired (under 21) |
| DWI law in Texas | DWI, DUI (minor with any detectable amount of alcohol, Alc. Bev. Code § 106.041) |
| DUI law in Utah | DUI, extreme DUI, impaired driving (reduced plea under § 41-6a-502.5), Not-a-Drop (under 21) |
| DUI law in Vermont | DUI |
| DUI law in Virginia | DUI, DWI (driving while intoxicated) |
| DUI law in Washington | DUI, physical control (RCW 46.61.504), driver under 21 consuming alcohol or cannabis (RCW 46.61.503) |
| DUI law in West Virginia | DUI, driving under the influence of alcohol, controlled substances, or drugs |
| OWI law in Wisconsin | OWI, Operating While Intoxicated, PAC (operating with a prohibited alcohol concentration), absolute sobriety violation (under 21) |
| DUI law in Wyoming | DUI, driving while under the influence, youthful driver with detectable alcohol concentration (under 21) |
From each state's statutes, DMV and court pages, checked October 2026. Each state's page links its sources.
Where an OWI Can Happen: Roads, Parking Lots and Beyond
OWI laws are not limited to public highways. The places they cover are written into each statute.
- Michigan: a highway or any other place open to the general public or generally accessible to motor vehicles, including an area designated for parking (Mich. Comp. Laws § 257.625).
- Wisconsin: highways plus premises held out to the public for their vehicles, lots employers provide to employees, and lots for tenants of rental buildings with 4 or more units, whether publicly or privately owned and whether or not a fee is charged. Private parking areas at farms and single-family homes are excluded (Wis. Stat. § 346.61).
- Massachusetts: any way or place where the public has a right of access, or where members of the public have access as invitees or licensees (M.G.L. c. 90, § 24).
The table below lists every state’s main term and the other names in its law, so you can see where your state’s charge fits.
OWI First Offense: How the Operating States Compare
A basic first offense is not a felony in any of the states shown here, but the grade of the offense varies a great deal. Wisconsin stands apart: a basic first OWI is a civil forfeiture, not a crime.
| State | First offense classification | Jail range for a first offense |
|---|---|---|
| Wisconsin | Civil forfeiture (Wis. Stat. § 346.65) | None for the forfeiture; a second offense carries 5 days to 6 months |
| Michigan | Misdemeanor | Up to 93 days, or up to 180 days at a BAC of 0.17 or more |
| Iowa | Serious misdemeanor | 48 hours to 1 year |
| Ohio (OVI) | First-degree misdemeanor | 3 consecutive days mandatory (or a 3-day intervention program), up to 6 months |
| Maine (OUI) | Class D crime, strict liability | At least 48 hours with a test of 0.15 or more, speeding 30 mph or more over the limit, eluding, or a passenger under 21; at least 96 hours after a test refusal |
| Massachusetts (OUI) | Misdemeanor | Up to 2 and a half years |
Fines, license suspensions and other terms are on each state’s penalties page, including Wisconsin, Michigan, Iowa, Ohio and Indiana. Repeat offenses climb quickly: Iowa makes a third OWI a class D felony. The first DUI guide compares first-offense penalties in every state, and the felony DUI guide covers when a repeat charge becomes a felony.
OWI and Your Driver’s License
An OWI arrest usually puts your license at risk in two ways: through the court case and through the state’s licensing agency, which can act separately and quickly. The licensing side often has a short deadline to request a hearing.
Check your state’s deadline with the DUI deadline calculator as soon as you can. The Wisconsin license suspension page and the Michigan license suspension page set out how each state handles it. If you refused a breath or blood test, read the implied consent guide, because refusal carries its own license penalty in many states.
What to Do After an OWI Arrest
- Read your paperwork for the charge and the court date, and note your arrest date.
- Use the deadline calculator to find the last day to request a license hearing.
- Open your state page from the state list for penalties, test limits and the hearing process, or compare states on the state law comparison.
- Read what happens after a DUI arrest for the order of events from booking to sentencing.
- Speak with a lawyer licensed in your state, the state bar’s lawyer referral service, or the public defender. You can ask about a public defender at your first court appearance, and the lawyer guide explains how to check a lawyer’s license.
The letters on your ticket only tell you which state’s law applies. What “operating” means, where the law reaches and what a first offense carries all come from that state’s statute.
Frequently Asked Questions
What Does OWI Stand For?
Operating while intoxicated. Michigan and Iowa use those exact words in their statutes, and Indiana's law calls it operating a vehicle while intoxicated. Wisconsin's law, also called OWI, bars driving or operating a motor vehicle while under the influence or with a prohibited alcohol concentration (Wis. Stat. § 346.63).
Is an OWI the Same as a DUI?
It is the same kind of offense under a different name. The difference that can matter is the word "operating," which some states define more broadly than driving. The DUI vs DWI guide compares every state's term.
What Is a PAC Charge in Wisconsin?
PAC stands for prohibited alcohol concentration. It is the per se version of Wisconsin's OWI law: operating with an alcohol concentration at or over the limit, whether or not you appeared impaired. The Wisconsin penalties page covers both.
Can You Get an OWI for Drugs?
Yes. Iowa's OWI law covers driving under the influence of alcohol or another drug, and driving with any amount of a controlled substance in your blood or urine (Iowa Code § 321J.2). Michigan's covers alcohol, controlled substances and other intoxicating substances.
Is a First OWI a Felony?
Not in its basic form in the operating states compared here. A first offense is a civil forfeiture in Wisconsin, a misdemeanor in Michigan and Ohio, a serious misdemeanor in Iowa and a Class D crime in Maine. Repeat offenses and injury can raise the charge. See is a DUI a felony for every state.
What Does OUI Mean in Massachusetts and Maine?
Operating under the influence. Massachusetts applies it on any way or place where the public has a right of access, or access as invitees or licensees (M.G.L. c. 90, § 24). Maine's OUI covers operating under the influence of intoxicants or with an alcohol level of 0.08 or more (29-A M.R.S. § 2411).
More on DUI Basics
- DUI vs DWI vs OWIWhat each term means and which states use which
- Blood Alcohol LimitsThe 0.08 limit, commercial and under-21 limits, and enhanced-BAC tiers
- Implied ConsentWhat refusing a breath or blood test costs you, state by state
- DUI CheckpointsWhich states allow sobriety checkpoints and where agencies announce them
- What Happens After a DUIThe arrest, license deadline, court process and what comes after
- Finding a DUI LawyerWhat a DUI lawyer does, public defenders, and how to check a lawyer's license
This guide explains DUI law in plain language from official sources. It isn't legal advice; laws differ by state and change, and a lawyer licensed in your state can advise on your case.