DUI Laws in Iowa: Penalties, BAC Limits & License Suspension

In Iowa, drunk or drugged driving is not called "DUI" or "DWI" — the state's criminal code (Iowa Code chapter 321J) calls it Operating While Intoxicated, or OWI. The per se legal limit is a blood alcohol concentration (BAC) of 0.08 for regular drivers 21 and over — the same national threshold used in every state. But if you were arrested, the single most urgent fact to know is this: the Iowa Department of Transportation (Iowa DOT) can revoke your license administratively, separate from any criminal case, and you generally have only 10 days from receiving the revocation notice to request a hearing and contest it. Miss that window and you lose the right to fight the administrative revocation, period.

What OWI means in Iowa, and why the terminology matters

Iowa's statute is titled "Operating While Intoxicated," and that is the term used on your charging paperwork, your court file, and any correspondence from Iowa DOT. You may hear people casually say "DUI," but if you're researching Iowa law, statutes, or court records, search for "OWI" — that's the term that will actually match what you're facing under Iowa Code section 321J.2.

Per se BAC limits in Iowa

Iowa Code 321J.2 and 321J.2A set out three separate thresholds depending on who is driving:

• 0.08 — the standard per se limit for drivers 21 and older. This is the nationally uniform limit used by every state.
• 0.04 — the limit for holders of a commercial driver's license (CDL) operating a commercial vehicle, consistent with federal commercial-driver rules that Iowa has adopted.
• 0.02 — Iowa's "zero tolerance" limit for drivers under 21 (Iowa Code 321J.2A). Any detectable alcohol concentration of 0.02 or more can trigger a license revocation for an underage driver, even without a criminal OWI charge.

Iowa does not have a separately named "aggravated OWI" charge the way some states do, but a BAC of more than 0.15 carries real consequences: under Iowa Code 321J.2, a defendant above 0.15 is ineligible for a deferred judgment (the option that can let a first offense avoid a formal conviction), and a BAC over 0.15 combined with certain revocation rules can also delay eligibility for a temporary restricted license. If your test result is anywhere near that 0.15 mark, confirm exactly how it affects your case with the court file and, ideally, a local defense attorney.

Implied consent and refusing a chemical test

Like every state, Iowa has an implied consent law: by driving on Iowa roads, you've already agreed to submit to a chemical test (blood, breath, or urine) if a peace officer has reasonable grounds to believe you're operating while intoxicated. Refusing that test doesn't avoid a license consequence — it triggers one automatically:

• First refusal: your license is revoked for one year if you have no previous OWI-related revocation (Iowa Code 321J.9).
• Second or subsequent refusal (with a previous revocation): the revocation jumps to two years.

Refusal also carries its own separate weight in a criminal case: prosecutors and courts can use the fact that you refused, and under Iowa Code 321J.2, a refusal is one of the factors that makes a defendant ineligible for a deferred judgment on a first offense. In other words, refusing does not "protect" you — it typically triggers a longer administrative revocation than failing the test would, and it can make your criminal case harder to resolve favorably.

The administrative license revocation — and the 10-day deadline

Separate from the criminal charge, the Iowa DOT can revoke your driving privileges after you fail the chemical test (0.08 or above, or 0.02 or above if you're under 21) or refuse it. This is a civil, administrative action — it happens whether or not you're ever convicted of OWI.

This is the time-critical part. Under Iowa Code 321J.13, you must request a hearing to contest the revocation within 10 days of receiving the notice of revocation — or your right to a hearing is permanently foreclosed. If you timely request a hearing, Iowa DOT must give you an opportunity to be heard within 45 days, and the hearing is limited to specific issues, such as whether the officer had reasonable grounds, whether you actually refused, and whether the test was properly conducted. Because the deadline is so short and starts running immediately, most people benefit from contacting a local Iowa defense attorney within days of arrest — not weeks — specifically to preserve this hearing right.

First-offense OWI penalties in Iowa

A first OWI conviction in Iowa is a serious misdemeanor. Based on current Iowa Code 321J.2:

• Jail: a mandatory minimum of 48 hours in county jail, with a maximum exposure of up to one year, though credit is given for time already served and the court has some discretion in how the sentence is served.
• Fine: the statute sets a base fine of $1,250, a portion of which (up to $625) the court can waive if you present a temporary restricted license — but state-mandated surcharges and court fees are added on top, so your total financial exposure will be higher than the base number. Confirm the current total with the court or a local attorney rather than assuming a fixed figure.
• License revocation: a minimum of 180 days, up to one year if you refused testing.
• Ignition interlock device (IID): Iowa DOT requires an approved IID on every vehicle you operate if you want a temporary restricted license during the revocation period. In practice, this means most first-offense drivers who want to keep driving to work will need to install one.
• Substance abuse evaluation: a required, self-funded substance abuse evaluation and, if recommended, treatment and a drinking-drivers course.

A first offense can sometimes qualify for a deferred judgment (avoiding a formal conviction on your record if you complete probation), but Iowa Code 321J.2 disqualifies you from that option if your BAC exceeded 0.15, you refused testing, you have a prior OWI or OWI-related revocation within the past 12 years, the offense caused injury to someone else, or you've already received a deferred judgment before.

The lookback (washout) period: 12 years

Iowa counts a prior OWI conviction against you for enhancement purposes if it falls within the previous 12 years. A conviction from another state under a substantially similar law counts too. This 12-year lookback is what determines whether your current charge is treated as a first, second, or third offense — it's worth confirming your exact record with the clerk of court, since older convictions that fall outside the window generally don't count for classification purposes.

When OWI becomes a felony in Iowa

Iowa Code 321J.2 makes a third OWI offense (and every offense after that) a class "D" felony, punishable by an indeterminate prison term of up to five years, a mandatory minimum of 30 days actually served, a fine in the thousands of dollars, and a six-year license revocation. A second offense, by contrast, is an aggravated misdemeanor — the felony line in Iowa is specifically the third offense within the 12-year lookback.

Separately, if an OWI results in someone else's death, Iowa treats that as its own, more serious felony (a class "B" felony punishable by up to 25 years) with a six-year license revocation; an OWI causing serious injury to someone other than the driver is also charged as its own felony. These injury and death enhancements exist independent of how many prior OWIs you have, so even a first-time offender can face felony exposure if the incident caused serious injury or death.

What to do after a DUI (OWI) arrest in Iowa

1. Read every paper you're given at the time of arrest or release. Look specifically for the notice of revocation and the form for requesting a hearing — the 10-day clock to contest your license revocation starts running immediately, often before you've even been formally charged in court.
2. Calendar the 10-day hearing-request deadline the same day. This is separate from your criminal court dates. If you want to preserve any chance of contesting the administrative revocation, the request has to go to Iowa DOT within that window — not to the court.
3. Contact a local Iowa criminal defense attorney as soon as possible. Because the administrative deadline is so short, waiting even a week can cost you the hearing right entirely.
4. Do not drive on a revoked license. Ask your attorney or Iowa DOT about a temporary restricted license and the ignition interlock device requirement before you get back behind the wheel.
5. Follow through on required evaluations. The substance abuse evaluation is mandatory on conviction, and getting ahead of it can sometimes help with sentencing or probation conditions — ask your attorney about timing.
6. Verify every number in this guide against the current Iowa Code or Iowa DOT before you rely on it. Fines, surcharges, and interlock rules are amended by the legislature from time to time, so confirm the current version applies to your arrest date.

This article is general legal information about Iowa law, not legal advice for your specific situation — confirm current details with the Iowa Department of Transportation, the Iowa Code, or a licensed Iowa attorney.