An OWI arrest in Sun Prairie starts two tracks at once: the court case itself, and the license deadlines that run whether you act or not. Depending on whether you refused the evidentiary test or failed it, you may have as little as 10 days to protect your driving privileges. Mays Law Office defends OWI charges — what most people call DUI or DWI — and drugged-driving allegations in Sun Prairie and throughout Dane County from our office in Middleton. Before you enter a plea or sign anything, call 608-305-4518 for a free consultation.

OWI Attorneys in Sun Prairie, WI

Attorney Stephen E. Mays has been practicing law in Wisconsin since 1995 and was selected as a 2025 Wisconsin Super Lawyer in DUI/DWI defense. His memberships include the National Association of Criminal Defense Lawyers, the Wisconsin Association of Criminal Defense Lawyers, the Dane County Criminal Defense Lawyers Association, and the State Bar of Wisconsin. Dane County is home ground for this practice, and in a Sun Prairie OWI case, knowing which court you are standing in and how it runs its calendar is half the battle. The other half is the evidence — the stop, the roadside tests, the breath or blood result — and we start asking those questions on the first call.

When to Call Our Sun Prairie, WI OWI Lawyers

Pick up the phone right away if any of these fits your situation:

• Police handed you a Notice of Intent to Revoke after you declined the test. A written refusal-hearing request is due within 10 days — without it, revocation takes effect automatically 30 days after the notice.
• You failed the evidentiary test. That starts its own clock: 10 days to request administrative review before a 6-month administrative suspension begins 30 days after the notice is issued.
• This is not your first OWI. With a prior inside 10 years, a second offense is a crime — and the ladder climbs from there to a Class H felony at the fourth (full penalty grid below).
• A passenger under 16 was in the car. That single fact makes even a first offense a criminal misdemeanor with mandatory jail time.
• Someone was hurt. Causing bodily injury to another person makes a first offense criminal; great bodily harm or death brings separate felony charges with far heavier prison exposure.
• Your paycheck depends on a CDL. One OWI conviction — even in your personal vehicle — disqualifies your commercial privileges for a year; a second lifetime conviction disqualifies them permanently.
• Your first-offense test result was 0.15 or higher. That reading carries a mandatory one-year ignition interlock order.

OWI Penalties Under Wisconsin Law

A Sun Prairie OWI is charged under state law, so the penalty ladder is the same one every Wisconsin driver faces. Wisconsin prosecutes drunk driving as OWI — DUI and DWI are the search terms, not separate charges. (A single stop can also produce a companion PAC count for the alcohol concentration itself; a driver found guilty of both is sentenced on one conviction.) Penalties climb with each prior:

• First offense. Civil forfeiture, not a crime. $150–$300, plus the mandatory $435 surcharge. No jail. License revoked 6–9 months.
• Second offense. Criminal misdemeanor if the prior happened within 10 years. Jail: 5 days to 6 months.
• Third offense. Jail: 45 days to 1 year. From here on, priors count for life — earlier OWIs, refusal revocations, and qualifying out-of-state convictions all come back into play.
• Fourth offense. Class H felony. 60 days to 6 years of imprisonment.
• Minor under 16 in the car. Even a first offense becomes a criminal misdemeanor: a $350–$1,100 fine and 5 days–6 months in jail.
• Ignition interlock. Required in three situations only: a test refusal, a first offense with a BAC of 0.15 or higher, or a repeat offense.
• Your license. Revocation accompanies every conviction. An occupational license can cover work, school, and treatment driving — but eligibility is not automatic. It depends on your suspension type, interlock status, the rest of your driving record, and DMV approval.
• Deadlines. Refused the evidentiary test? 10 days to request a refusal hearing. Failed it (the station breath or blood test, not the roadside PBT)? 10 days to request administrative review.

Miss a deadline and the license consequences run on autopilot.

The Real Cost of an OWI

The citation shows one number. The real bill has several:

• $435 — mandatory OWI surcharge on every conviction.
• $165–$500 — the required alcohol and drug assessment (varies by county).
• $50–$150 to install, $60–$100 per month — ignition interlock, if one is ordered.
• $200 — license reinstatement fee.
• Years of SR-22 high-risk insurance premiums stacked on top.

A typical first offense totals $4,000 to over $10,000 all-in. Every figure above is a typical range — your county, your vendor, and your insurer set the actual numbers, so treat these as planning estimates rather than a quote. Weigh the cost of a defense against that full total before deciding to simply pay and plead through. A free consultation costs nothing: 608-305-4518.

How OWI Cases Move Through Sun Prairie and Dane County Courts

Sun Prairie sits on US-151, and that shapes who stops you as much as where your case ends up. The Sun Prairie Police Department patrols the city itself, while the Wisconsin State Patrol and the Dane County Sheriff’s Office are regularly active along the 151 corridor — a stop that begins on the highway can end as an OWI arrest handled by any of the three. Enforcement here is data-driven: the Dane County Traffic Safety Commission has identified Sun Prairie as home to several of the county’s crash “hotspot” areas, bringing saturation patrols and multi-agency holiday task-force deployments like “Drive Sober or Get Pulled Over.”

Where the case goes depends on the charge. A civil first-offense OWI cited by Sun Prairie officers is heard in the Sun Prairie Municipal Court — second floor of the municipal building, 300 E. Main Street — and prosecuted by the city attorney’s office. The court’s standard procedure has defendants appear on Wednesday mornings to enter a plea; plead not guilty and a pretrial conference with the city’s prosecutor is typically available immediately, the same morning. That compressed schedule cuts both ways: decisions get made fast, which is exactly why the time to talk to a defense lawyer is before that Wednesday, not after.

Every criminal OWI — a repeat offense charged as a crime, or any first offense involving a minor passenger or injury — bypasses the municipal court entirely. Those cases are filed in the Dane County Circuit Court at 215 S. Hamilton Street in downtown Madison and prosecuted by the Dane County District Attorney’s Office — the same courthouse that handles OWI cases arising in Madison. Our Wisconsin OWI defense practice works both sides of that divide.

How We Defend OWI Charges

Prosecutors must build an OWI case in layers. Defending one means testing every layer:

• The stop. Reasonable suspicion is required to stop you. Probable cause is required to arrest you. A defect in either may support a motion to suppress the resulting evidence.
• Field sobriety tests. The three standardized tests are error-prone. The validation research excluded people 65 and older and those 50 or more pounds overweight. Arthritis, inner-ear problems, leg injuries, cold, wind, wet pavement, footwear — each can produce false “clues.”
• The breath number. For most drivers 0.08 is the line — drivers behind the wheel of a commercial vehicle, under-21 drivers, drivers under an interlock order, and anyone with three or more priors face stricter limits — and close readings invite challenge. Chemical-test reliability is a core defense front, and after you take the agency’s primary test you can request its alternative test free of charge, or arrange your own testing at your own expense.
• The blood draw. Drawing blood is a Fourth Amendment search. In State v. Prado (2021), the Wisconsin Supreme Court struck down the presumption that an incapacitated driver consents. Exceptions like exigent circumstances can still justify a draw, but a warrantless draw without valid consent faces serious scrutiny.
• The operation element. The State must prove you operated the vehicle — physically manipulated or activated the controls needed to put it in motion. Parked-car and sleeping-driver cases often turn on this element.
• The license track. Refusal hearings and administrative reviews run parallel to the main case. Both carry 10-day request windows.

No single defense fits every arrest. The right one comes out of your reports, your video, and your facts — 608-305-4518 starts that review.

Sun Prairie OWI Questions We Hear Most

What happens at the Wednesday-morning court date in Sun Prairie?

For a civil first-offense OWI cited in Sun Prairie, you appear at the Sun Prairie Municipal Court — 300 E. Main Street, second floor — on a Wednesday morning to enter a plea. Plead not guilty, and a pretrial conference with the city prosecutor is typically available immediately, the same morning. Positions get staked out early in this court, so have your strategy set before you walk in.

I was asleep in a parked car. Can they really charge me?

Yes. Wisconsin law punishes “operating,” not just driving — the physical manipulation or activation of any control of the vehicle necessary to put it in motion. Depending on the facts, a driver found asleep behind the wheel with the engine running can be prosecuted for OWI even though the car never moved.

Is refusing the test better than failing it?

They are two different problems, not a loophole and a trap. Refusal is a stand-alone violation: a first refusal brings a 1-year license revocation, a mandatory alcohol assessment, and a mandatory 1-year ignition interlock — and the refusal itself can be used as evidence against you in the OWI case. Failing the evidentiary chemical test — the breath, blood, or urine test after arrest, not the roadside preliminary breath test — instead triggers a 6-month administrative suspension. Either way, the clock is the same: 10 days to request a refusal hearing or administrative review, or the license consequence takes effect on its own 30 days after the notice is issued. Which situation you are in changes the strategy — it does not change the urgency.

Can I get an OWI expunged later?

No. Wisconsin’s expungement statute excludes OWI convictions entirely, and the civil first offense stays on your WisDOT driving record permanently — and once you reach a third offense, every prior counts, no matter how old.

Is a lawyer really worth it for a civil first offense?

The first offense is where the record starts. It cannot be expunged, it raises your insurance for years, it disqualifies commercial driving privileges for a year if you hold a CDL, and it sets the counting clock — a second OWI within 10 years is a crime, and it counts forever once you reach a third. Challenging a weak stop or an unreliable test is often the cheapest insurance you will ever buy.

Get a Free Consultation

Se Habla Español — Call 608-305-4518

Whether your case is headed for a Wednesday morning on Main Street or the Dane County Courthouse in Madison, the earliest days decide the most. Call 608-305-4518 or contact Mays Law Office online for a free consultation. Mays Law Office, LLC — 6405 Century Ave STE 103, Middleton, WI 53562.