What Are the DUI Penalties in Connecticut?

Connecticut DUI penalties escalate fast. A first conviction is a misdemeanor carrying a $500 to $1,000 fine and at least 48 hours in jail; a second within ten years is a felony with a mandatory 120 days; a third within ten years means at least a year in prison, up to $8,000 in fines, and permanent loss of your license. On top of the criminal case, the DMV runs its own administrative suspension the moment you fail or refuse a chemical test, so your license can be gone before a judge ever hears your case.

First Offense

A first DUI conviction is a misdemeanor. The court fines you $500 to $1,000 and can impose up to six months in jail. Forty-eight consecutive hours of any sentence cannot be suspended or reduced, so a first-time defendant will spend at least two full days in custody.¹

The court has an alternative. It can suspend the jail sentence entirely and place you on probation with 100 hours of community service.¹ It is one track or the other, not both.

Your license is suspended for 45 days. When it comes back, you must install an ignition interlock device on every vehicle you own or drive and use it for one year.²

The Diversion Program Most First-Timers Use

If you have never been convicted of DUI and have not used the program in the past ten years, you can apply for the Pretrial Alcohol Education Program. The case is paused while you complete either a ten-session or fifteen-session intervention program over a year. Finish it, and you can ask the court to dismiss the charges entirely.³ A dismissal means no conviction on your record.

Any prior DUI conviction in any state disqualifies you. If a victim suffered serious physical injury, you have to notify them by certified mail, and they have the right to be heard before the court accepts you.³

A second diversion option, the Pretrial Impaired Driving Intervention Program, exists for people who already used the alcohol education program on a prior arrest, as long as ten years have passed. It is more intensive: twelve education sessions or at least fifteen treatment sessions, plus a $100 application fee, a $150 evaluation fee, and a $400 program fee (or $100 for the treatment track, plus the provider’s charges).⁴

Second Offense Within Ten Years

A second DUI conviction within ten years of a prior conviction is a felony. Fines rise to $1,000 to $4,000, and the maximum sentence doubles to two years. The mandatory minimum is 120 consecutive days, and the court cannot suspend any of them.¹

Community service is no longer an alternative at this level. The statute requires both: 120 days behind bars and probation that includes 100 hours of community service, a substance abuse assessment through the Court Support Services Division, and whatever treatment the court orders.¹

License suspension is again 45 days, followed by a three-year ignition interlock requirement. During the first year of that stretch, you can only drive to and from work, school, a substance abuse treatment program, an interlock service center, or your probation officer.²

Third Offense Within Ten Years

A third DUI conviction within ten years is a felony carrying fines of $2,000 to $8,000 and up to three years in prison, with a one-year mandatory minimum that cannot be suspended or reduced.¹ The court also imposes probation with 100 hours of community service, a substance abuse assessment, and any treatment ordered.

Your license is permanently revoked. You cannot legally drive again until you petition the DMV Commissioner for reinstatement, and you must wait at least two years from the date of revocation to file that petition.² The petition requires documentation showing completion of an alcohol or drug treatment program, no alcohol- or drug-related convictions or suspensions in the prior two years, and no driving at all during that waiting period. If reinstatement is granted, you must use an ignition interlock device for as long as you hold a license, though the Commissioner has discretion to lift that requirement after 15 years.⁵

The DMV Suspension That Runs Alongside Your Case

The criminal case and the DMV action are two separate tracks. You can lose your license through the DMV before your court case starts, and the DMV suspension happens regardless of the criminal outcome.

Under Connecticut’s implied consent law, every driver on state roads is deemed to have consented to a chemical test of blood, breath, or urine on a DUI arrest.⁶ Fail the test or refuse it, and the DMV suspends your license for 45 days, usually starting 30 days after the arrest.²

The interlock consequences after the suspension differ:

Failing the test at 21 or older: IID for six months on a first offense, one year on a second, two years on a third.
Failing the test under 21: IID for one year, two years, and three years respectively.
Refusing the test at any age: IID for one year, two years, or three years.

If you are also convicted in court, you serve whichever IID period is longer, the administrative one or the court-ordered one. They do not stack. A refusal can also be used against you at trial.⁶

Ignition Interlock Costs and Durations

Nearly every DUI offender in Connecticut ends up with an interlock. The device is a breathalyzer wired to the ignition; blow into it, and if it detects alcohol, the car will not start.

You pay all costs of installation, calibration, and removal.⁷ The DMV charges a $100 IID administration fee.⁸ The device needs professional calibration about every 30 days; miss the appointment by more than a week and it locks you out of the vehicle.

Court-ordered IID periods after conviction:

First conviction: one year after license restoration.
Second conviction: three years after restoration, with driving limited to essential trips during the first year.
Third conviction: lifetime if your license is reinstated, unless the DMV Commissioner removes the restriction after 15 years.

Drivers Under 21

Connecticut applies a much lower BAC threshold to drivers under 21: .02% is enough to be charged under a separate statute, an amount that a single drink can produce.⁹² The fine ranges, jail terms, license suspensions, and IID requirements mirror the standard structure, and the administrative IID periods for test failure are longer than for drivers 21 and over.

Driving Impaired With a Child in the Car

Connecticut has no standalone enhanced DUI penalty for driving drunk with a child passenger. Prosecutors instead file a separate charge of risk of injury to a minor if a child under 16 was in the vehicle. That is a Class C felony carrying up to ten years in prison and a fine of up to $10,000, prosecuted independently of the DUI, so both sets of penalties can hit in the same case.¹⁰

Commercial Driver’s License Holders

Federal law sets the CDL threshold at .04% BAC, half the standard limit, and it applies whether you were on duty or off duty.¹¹ A first DUI conviction disqualifies your CDL for one year; three years if you were hauling hazardous materials. A second conviction is a lifetime CDL disqualification.¹²

What the Fine Doesn’t Cover

Court fines are one line on a much longer bill. Add the IID installation and monthly service fees, the $100 DMV administration fee, license reinstatement costs, defense counsel (typically $2,000 to $7,500 for a first offense), and the insurance premium jump that follows a DUI, and total costs commonly run into the tens of thousands over several years. Connecticut may also require an SR-22 certificate of financial responsibility to reinstate your license, which layers onto insurance costs for several years.

Travel across the Canadian border is another consequence people miss. Canada treats DUI as a serious criminal offense under its immigration law, and a conviction generally makes you inadmissible. Within five years of completing your sentence, entry requires a Temporary Resident Permit. Between five and ten years, you can apply for Criminal Rehabilitation. Only after ten years, and only with a single conviction, might you qualify for automatic rehabilitation by passage of time.

1
Justia. Connecticut Code 14-227a – Operation While Under the Influence of Liquor or Drug or While Having an Elevated Blood Alcohol Content
2
Connecticut Department of Motor Vehicles. Driving Under the Influence: Laws and Penalties
3
FindLaw. Connecticut Code 54-56g – Pretrial Alcohol Education Program
4
Justia. Connecticut Code 54-56r – Pretrial Impaired Driving Intervention Program
5
Connecticut General Assembly. License Suspension and IID Requirement
6
Justia. Connecticut Code 14-227b – Implied Consent to Test Operators Blood, Breath or Urine
7
FindLaw. Connecticut Code 14-227j – Court Order Prohibiting Operation of Motor Vehicle Not Equipped With Ignition Interlock Device
8
Connecticut Department of Motor Vehicles. Ignition Interlock Device (IID) Program
9
Justia. Connecticut Code 14-227g
10
Connecticut General Assembly. Penalties for Driving Under the Influence With Minor
11
Federal Motor Carrier Safety Administration. Is a Driver Disqualified for Driving a CMV While Off-Duty With a Blood Alcohol Concentration Over 0.04 Percent
12
Office of the Law Revision Counsel. 49 USC 31310 – Disqualifications