Connecticut DUI Laws: Penalties, BAC Limit & License (2026)

In Connecticut the offense is driving (operating) under the influence, often called DUI or OUI, and Connecticut General Statutes 14-227a makes it unlawful to drive with a blood alcohol concentration (BAC) of 0.08 percent or more. A first offense carries up to six months in jail with a two-day mandatory minimum, a $500 to $1,000 fine, and a 45-day license suspension followed by one year on an ignition interlock device, according to the Connecticut DMV.

This guide is part of our DUI Laws by State series.

What counts as a DUI in Connecticut

Connecticut charges the offense as operating a motor vehicle under the influence under Connecticut General Statutes 14-227a. The statute creates two ways to prove the offense: operating while under the influence of alcohol or drugs, or operating with an elevated BAC of 0.08 percent or more. Because the first definition does not require a specific number, a driver under 0.08 can still be convicted if the State proves impairment. Commercial drivers face a 0.04 percent limit, and drivers under 21 fall under the zero-tolerance rule, which sets the limit at 0.02 percent, as the Connecticut DMV explains. The 0.08 figure is the federal benchmark adopted by every state except Utah, which uses 0.05 percent, as the National Highway Traffic Safety Administration describes.

First-offense DUI penalties in Connecticut (jail, fines, suspension)

A first DUI is a misdemeanor. According to the Connecticut Office of Legislative Research summary of General Statutes 14-227a, the penalties include up to six months in jail with a mandatory minimum of two days, or probation with a condition of 100 hours of community service in place of the mandatory jail. The fine ranges from $500 to $1,000. The court suspends the license for 45 days, after which the driver must use an ignition interlock device for one year. A second conviction within the look-back period raises the exposure to up to two years in jail with a 120-day mandatory minimum, and a third to up to three years with a one-year mandatory minimum. Drivers must also carry SR-22 financial-responsibility insurance to reinstate.

Watch out: The DMV administrative suspension under 14-227b and the criminal case under 14-227a run on separate tracks. You can resolve the criminal charge and still face the DMV suspension, and the DMV suspension can take effect even before the criminal case is decided.

Ignition interlock requirements in Connecticut

Connecticut requires an ignition interlock device for every DUI offender, including first offenders, which sets it apart from states that reserve the device for repeat or high-BAC cases. As the Connecticut DMV explains, after a first offender serves the 45-day license suspension, that driver must operate only a vehicle equipped with an IID for one year. For a second offense, the interlock requirement runs three years, and during the first year the driver may use the vehicle only to get to work, school, treatment, or an interlock service center. A driver who refused the chemical test faces a six-month interlock requirement after the administrative suspension. The device requires a breath sample before the engine starts and at random points during the trip, and the program is administered through the DMV.

License suspension and the administrative process in Connecticut

Connecticut runs two suspension systems at once. The administrative per se suspension under Connecticut General Statutes 14-227b is a civil action by the DMV based on the chemical test result or a refusal, separate from the criminal case. As the Connecticut DMV explains, a driver who fails or refuses the test faces a 45-day suspension that generally begins about 30 days after the arrest. After the suspension, the driver must install an ignition interlock device, for one year following a test failure or six months following a refusal on a first offense. A separate court suspension follows a conviction. The arresting officer takes the license and serves a suspension notice, and the driver may request a DMV hearing within the deadline on the notice.

Repeat offenses and the Connecticut look-back period

Connecticut counts prior DUI convictions within a 10-year look-back window, so penalties escalate sharply for offenses inside that period. According to the Connecticut Office of Legislative Research, a second DUI within 10 years carries up to two years in jail with a 120-day mandatory minimum, a $1,000 to $4,000 fine, and a 45-day suspension followed by three years on an interlock. A third or subsequent DUI within 10 years carries up to three years in jail with a one-year mandatory minimum, a $2,000 to $8,000 fine, and permanent license revocation, with eligibility to reapply after two years. Standard DUI offenses remain classified as misdemeanors, but a driver who causes serious injury or death while impaired faces separate felony charges such as second-degree manslaughter or assault with a motor vehicle regardless of offense number.

Watch out: Refusing the breath, blood, or urine test does not protect your license. A first refusal triggers a 45-day administrative suspension plus a six-month interlock requirement, and the refusal can be used against you in the criminal case.

Refusing a breath or blood test in Connecticut

Connecticut's implied consent law, in Connecticut General Statutes 14-227b, provides that by driving in the state you have consented to a test of your blood, breath, or urine if an officer has probable cause for a DUI arrest. According to the Connecticut DMV, a refusal results in a 45-day administrative suspension followed by an ignition interlock requirement of six months on a first refusal, with longer interlock terms for second and third refusals. Failing the test produces the same 45-day suspension but a one-year interlock requirement. The refusal can also be introduced as evidence in the criminal case. The driver may contest the suspension at a DMV hearing requested within the deadline stated on the suspension notice.

Can you expunge or seal a DUI in Connecticut

Connecticut courts cannot erase a DUI conviction directly, but the state offers a path to full erasure through the Connecticut Board of Pardons and Paroles. An absolute pardon, if granted, completely erases the adult criminal record, including a DUI conviction. A person may apply for an absolute pardon three years after the disposition of the most recent misdemeanor conviction, or five years after a felony, and the applicant cannot be on supervision or have pending charges when applying. For a DUI, the wait runs at least three years from the conviction date or the completion of any sentence or probation, whichever is later. Connecticut's Clean Slate law also automatically erases certain older misdemeanor convictions over time, though impaired-driving offenses have historically been treated differently, so applicants should confirm current eligibility.

What to do after a DUI arrest in Connecticut

A Connecticut DUI creates two separate matters: a criminal case in court under 14-227a and an administrative license case at the DMV under 14-227b. The deadlines are short, so a common first step is to request a DMV hearing within the window stated on the suspension notice, because missing it generally means the suspension takes effect automatically. The criminal case proceeds on its own schedule from arraignment through resolution. General information cannot tell you how your case will come out, since the outcome depends on the specific facts, the evidence, and your record. Many people consult a licensed Connecticut DUI attorney to understand the charge, the DMV deadline, and the options for both the criminal case and the license case. Keep the arrest paperwork, the suspension notice, and any test results in a safe place.