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

If you were just arrested in Connecticut, here is the core of what you need to know right now: the offense is called Operating Under the Influence (OUI) under Connecticut General Statutes § 14-227a, the standard per se blood alcohol limit is 0.08%, and the Connecticut Department of Motor Vehicles (DMV) will move to suspend your license on its own timeline — separate from any criminal case — unless you request a hearing within 7 days of when the DMV mails your suspension notice. Missing that window is one of the most common and most avoidable mistakes people make after an arrest.

What It's Called in Connecticut

Connecticut's statute, C.G.S. § 14-227a, is titled "Operation while under the influence of liquor or drug or while having an elevated blood alcohol content," and lawyers, courts, and the DMV commonly shorten this to OUI. In everyday conversation — and often in DMV and police paperwork — you'll also hear it called DUI or DWI. All three terms refer to the same offense in Connecticut; there is no legal distinction between them here. This guide uses OUI and DUI interchangeably, matching how the state itself refers to the charge.

Per Se BAC Limits in Connecticut

Connecticut, like every state, uses "per se" limits: if your blood alcohol content (BAC) is at or above the threshold for your category, you are considered intoxicated as a matter of law, regardless of whether your driving looked impaired.

• Standard drivers (age 21+): 0.08% BAC. This is the nationally common per se limit.
• Commercial driver's license (CDL) holders: 0.04% BAC when operating a commercial vehicle.
• Drivers under 21: 0.02% BAC — Connecticut's zero-tolerance standard for underage drivers, tied to C.G.S. § 14-227g. This is far below the standard limit and can be reached after a single drink.
• Elevated blood alcohol content: 0.16% or higher. Connecticut treats this level as an "elevated blood alcohol content" tier under § 14-227a, which can trigger a longer administrative license suspension and interlock period than a standard 0.08–0.159 reading.

Because interlock and suspension periods tied to the elevated-BAC tier can change with legislative updates, confirm the current breakdown with the Connecticut DMV or a Connecticut defense attorney if your case involves a 0.16+ reading.

Implied Consent and Refusing a Chemical Test

Under Connecticut's implied consent law (C.G.S. § 14-227b), operating a vehicle in the state means you've already agreed to submit to a chemical test (breath, blood, or urine) if a police officer has probable cause to believe you were driving under the influence. Refusing a test is not a way to avoid consequences — it triggers its own automatic license suspension through the DMV, separate from and in addition to any DUI charge.

For a first refusal, Connecticut's DMV imposes a 45-day license suspension followed by a 1-year ignition interlock device (IID) requirement once your license is restored. A refusal can also be introduced as evidence against you in the criminal case, and repeat refusals carry progressively longer interlock periods — two years for a second refusal and three years for a third or subsequent one. There is no scenario under Connecticut law where refusing a test guarantees you avoid license consequences.

The Administrative License Suspension — And Your 7-Day Deadline

This is the part people miss, and it is time-critical. Separately from any criminal prosecution, the Connecticut DMV can suspend your license through an "administrative per se" process based on the arresting officer's report of a failed or refused chemical test — before you've ever seen a judge or been convicted of anything.

After your arrest, the DMV mails you a Notice of Suspension. You have 7 days from the date that notice is mailed to request a hearing to contest the suspension. If you don't request a hearing within that window, the suspension proceeds automatically, typically beginning around 30 days after your arrest date.

• The unit handling these requests is the DMV's Administrative Per Se Unit, reachable at 860-263-5204 (weekdays, 8:30 a.m.–4:30 p.m.) or by email at DMV.AdminPerse@ct.gov.
• Read your suspension notice carefully — it will state the exact deadline and instructions for your specific case.
• Requesting a hearing does not make the suspension disappear automatically, but it preserves your only chance to challenge it administratively before it takes effect.

Because this deadline is short and starts running immediately, treat it as one of the very first things to act on after an arrest — well before you'd normally think about lawyering up for the criminal case.

First-Offense Penalties

For a first OUI/DUI conviction in Connecticut (BAC 0.08–0.159, age 21+), the general pattern under C.G.S. § 14-227a includes:

• License suspension: 45 days, followed by a required period (generally one year for a first alcohol-related offense) of driving only a vehicle equipped with an ignition interlock device.
• Ignition interlock device (IID): Required before full license restoration on essentially all alcohol-related first offenses in Connecticut — there is no way to skip the interlock requirement on a first offense.
• Jail exposure: Connecticut law allows for a jail sentence on a first offense, though courts frequently suspend some or all of that time in favor of probation and community service for a true first-time offender with no aggravating facts.
• Fines: A monetary fine within a range set by statute, plus mandatory court fees, an alcohol education/treatment program, and often a victim-impact or DUI-education class as a condition of any suspended sentence.

Exact dollar amounts and mandatory-minimum jail days in Connecticut's statute can be adjusted by the legislature, and your actual exposure depends heavily on your specific facts (BAC level, whether there was an accident, a child in the car, prior history, etc.). Don't rely on any number you read online, including here, as the final word — confirm the current statutory fine and jail ranges with the Connecticut DMV, the Connecticut Judicial Branch, or a Connecticut criminal defense attorney before assuming what you're facing.

How Far Back Do Prior DUIs Count? (Lookback Period)

Connecticut uses a 10-year lookback period to determine whether a new OUI charge counts as a "first," "second," or "third and subsequent" offense. If your prior DUI conviction falls within 10 years of the new arrest, it counts as a prior for sentencing and license-suspension purposes and triggers the enhanced penalties described above. A conviction older than 10 years generally will not enhance the current charge, though it can still be relevant context in court.

When a DUI Becomes a Felony in Connecticut

Most first and second DUI offenses in Connecticut are charged as misdemeanors. The offense escalates to felony territory in situations including:

• Third or subsequent OUI conviction within the 10-year lookback period — generally prosecuted as a felony under Connecticut law, with significantly higher mandatory jail exposure and a license revocation rather than a fixed-length suspension.
• Causing death while driving under the influence — can be charged as second-degree manslaughter with a motor vehicle, a felony carrying substantially more prison exposure than a standard DUI.
• Causing serious physical injury while driving under the influence — can be charged as second-degree assault with a motor vehicle, also a felony.

Having a child passenger in the vehicle, driving through a school zone, or striking a school bus are treated as aggravating factors that increase mandatory minimum penalties under Connecticut law, even when the underlying charge remains a misdemeanor DUI. Because exact charging decisions depend on the prosecutor and the specific facts, anyone facing a third offense, an accident with injury, or a case involving a child passenger should treat the felony question as something to confirm immediately with a Connecticut criminal defense attorney.

What to Do After a DUI Arrest in Connecticut

1. Read every piece of paper the officer gave you the moment you can. Look specifically for the DMV's Notice of Suspension and any date printed on it — this starts your 7-day clock to request a hearing.
2. Call the DMV's Administrative Per Se Unit (860-263-5204) or email DMV.AdminPerse@ct.gov well before the 7-day deadline to request your hearing. Do this even if you're still deciding whether to hire an attorney — the deadline does not wait for that decision.
3. Write down what you remember while it's fresh: the time of the stop, what you were told, whether you were given field sobriety or chemical tests, and what results or refusals were recorded.
4. Do not drive on a suspended license. Driving during a DUI-related suspension in Connecticut is itself a separate offense that can compound your problems.
5. Contact a Connecticut criminal defense attorney to review the arrest, the test results or refusal, and your specific charge — first offense, refusal, elevated BAC, or repeat offense all carry different exposure.
6. Ask your attorney or the court clerk about the ignition interlock installation process early, since it is required before restoration on essentially every alcohol-related Connecticut suspension.
7. Track every deadline in writing — the DMV hearing deadline, court dates, and any deadlines tied to interlock installation or license reinstatement paperwork.

For the DMV's official overview and current contact information, see the Connecticut DMV's Driving Under the Influence page and the full text of Connecticut General Statutes § 14-227a.

This article is general legal information about Connecticut law, not legal advice for your specific situation — confirm current details with the Connecticut DMV or a Connecticut-licensed attorney before acting.