Iowa OWI Laws: BAC Limits, Penalties, and License Revocation

Iowa OWI laws make it a crime to operate a vehicle with a blood alcohol concentration of 0.08% or higher, or while impaired by alcohol or drugs at any level that affects your driving. A conviction brings jail time, fines, and a felony charge by the third offense within 12 years. Separately, the Iowa Department of Transportation revokes your license through its own administrative process that runs independent of the criminal case, so you can lose driving privileges even if the criminal charge is later reduced or dismissed.

What BAC Triggers a Charge

For drivers 21 and older, 0.08% is the per se limit.¹ A lower reading doesn’t mean you’re safe: Iowa also prosecutes OWI under a general impairment standard, so an officer can arrest you if your driving ability is visibly affected even when your BAC comes in under 0.08%.

Commercial drivers face a 0.04% threshold under Iowa’s implied consent provisions.² Federal rules then impose at least a one-year disqualification from operating a commercial vehicle after any alcohol-related conviction, whether or not you were driving the commercial vehicle at the time.³

Drivers under 21 are covered by a zero-tolerance rule. A BAC of 0.02% or higher triggers a license revocation.⁴

Criminal Penalties by Offense

Penalties escalate with each prior OWI on your record within the previous 12 years. Convictions older than 12 years are purged from your driving record and no longer count toward enhancement.¹

If Someone Is Injured or Killed

An OWI that causes bodily injury to someone other than the driver adds a one-year license revocation on top of whatever other revocation applies. If the crash causes a death, the revocation jumps to six years and you cannot apply for a temporary restricted license for the first two years.⁶ Courts must also order restitution to victims in all convictions.⁷

Deferred Judgment on a First Offense

Iowa allows deferred judgment on some first OWIs, meaning the conviction will not appear on your permanent record if you complete every condition. Eligibility is narrow. You are disqualified if any of the following applies:

Your test result was above 0.15%.
You have a prior OWI conviction or prior OWI deferred judgment, in Iowa or elsewhere.
You refused chemical testing.
Someone other than you was injured.
You were driving on a suspended or revoked license.

Even a granted deferred judgment still counts as a prior offense if you are charged with OWI again, and the DOT still revokes your license for 30 to 90 days.⁸⁶

Administrative License Revocation

By driving on Iowa roads, you have already agreed under the implied consent law to submit to chemical testing when an officer has reasonable grounds to suspect impairment.² The DOT acts on the test result (or your refusal) regardless of how the criminal case ends.

If You Fail the Test

Submitting to the test and failing brings a 180-day revocation on a first occurrence. If you have a previous revocation under the OWI chapter, the period is one year.⁹

If You Refuse the Test

Refusing doesn’t protect you. The refusal itself brings a one-year revocation on a first refusal, and two years if you have any prior revocation under the OWI chapter.¹⁰ Refusing doesn’t prevent the charge either, and it eliminates your eligibility for deferred judgment.

Revocation After Conviction

Separate from the test-based revocation, the DOT imposes a revocation after a criminal conviction. First conviction mirrors the test-result periods (180 days if you tested, one year if you refused). Second conviction brings one to two years depending on test or refusal. Third or subsequent conviction brings a six-year revocation.⁶

Driving During the Revocation

Most OWI-revoked drivers can apply for a temporary restricted license (TRL) that restores limited driving privileges during the revocation period. A TRL holder can drive in any manner allowed under a standard class C license, but cannot operate a commercial vehicle or a school bus.¹¹

No TRL issues without an ignition interlock device. You must install an approved IID on every vehicle you drive before the DOT will issue the restricted license. The device prevents the vehicle from starting if it detects alcohol on your breath, and tampering with or removing it is a separate serious misdemeanor.¹¹

To apply, complete Form 430400 (Request for Temporary Restricted License — OWI Revocation) from the Iowa DOT website and pay any outstanding civil penalties first.¹²

Getting Your Full License Back

Once the revocation period ends, the DOT will not reinstate your license until every one of the following is complete:

A $200 civil penalty, separate from any criminal fines.¹³¹⁴
A substance abuse evaluation and any treatment it recommends, at your expense.¹³
Satisfactory completion of an approved drinking drivers course.¹³
After a second or later revocation, certification that an IID is installed on all vehicles you operate. The IID requirement runs at least one year from reinstatement, reduced by any time you drove with an IID on a TRL.¹³
SR-22 proof of financial responsibility, filed with the state by your insurer.

Skipping or delaying any single item keeps your license in revoked status, and driving on a revoked OWI license creates a fresh set of criminal charges.

What It Actually Costs

The statutory fine is the starting point. Ignition interlock installation runs roughly $70 to $150, with $55 to $136 per month in monitoring fees for as long as the device is required. On a first offense carrying the IID for 180 days, equipment costs alone can add $400 to $950. A second offense requiring an IID for a year or more after reinstatement runs higher.

SR-22 insurance adds its own expense. The filing fee itself is modest, typically $15 to $25, but insurers treat an OWI as a major risk factor and premiums rise substantially for several years. Iowa generally requires you to maintain the SR-22 for at least two years.

Add the $200 civil penalty, the substance abuse evaluation and treatment, the drinking drivers course fee, and court surcharges, and a first-offense OWI routinely costs several thousand dollars beyond the base fine.

Consequences That Follow You

An Iowa OWI does not stay in Iowa. Nearly every state participates in the Driver License Compact, which shares information about major traffic violations and license actions with your home state. Under the compact’s “one driver, one license, one record” principle, your home state treats an Iowa OWI as if it happened locally and applies its own penalties.¹⁵

Canada treats impaired driving as “serious criminality,” so a single OWI conviction can make you inadmissible at the border. You can apply for a Temporary Resident Permit for one-time entry, but approval is discretionary and requires showing a compelling reason to enter. To become fully admissible, you must apply for criminal rehabilitation, and that application cannot be submitted until at least five years after the end of your sentence, including probation.¹⁶

Many licensing boards in healthcare, law, education, and finance require self-reporting of criminal convictions, including misdemeanors. Failing to disclose can itself be an ethics violation, sometimes treated more severely than the underlying offense.

Commercial drivers take the hardest hit. Federal rules require at least a one-year disqualification from operating a commercial vehicle after any alcohol-related conviction. If the offense involved a commercial vehicle carrying hazardous materials, the disqualification is a lifetime ban.³ A felony third-offense conviction can also disqualify you from certain jobs, professional licenses, firearm ownership, and some government benefits, and Iowa does not automatically restore those rights when the sentence ends.

1
Justia. Iowa Code 321J.2 – Operating While Under the Influence of Alcohol or a Drug or While Having an Alcohol Concentration of .08 or More (OWI)
2
Justia. Iowa Code 321J.6 – Implied Consent to Test
3
Federal Motor Carrier Safety Administration. Disqualification of Drivers (383.51)
4
Iowa Legislature. Iowa Code 321J.2A – Persons Under the Age of Twenty-One
5
Iowa Legislature. Iowa Code 911.1 – Crime Services Surcharge
6
Iowa Legislature. Iowa Code 321J.4 – Revocation of License – Ignition Interlock Devices
7
Justia. Iowa Code 910.2 – Restitution or Community Service
8
Iowa Legislature. Iowa Code 907.3 – Deferred Judgment, Deferred Sentence, or Suspended Sentence
9
Justia. Iowa Code 321J.12 – Test Result Revocation
10
Justia. Iowa Code 321J.9 – Refusal to Submit – Revocation
11
Justia. Iowa Code 321J.20 – Temporary Restricted License – Ignition Interlock Devices
12
Iowa Department of Transportation. Temporary Restricted License (TRL)
13
Justia. Iowa Code 321J.17 – Civil Penalty – Disposition – Conditions for License Reinstatement
14
Iowa Department of Transportation. Operating While Intoxicated (OWI)
15
The Council of State Governments. Driver License Compact
16
Government of Canada. Convicted of Driving While Impaired