Pennsylvania DUI Statute: BAC Tiers, Penalties, and Lookback

Pennsylvania DUI penalties by BAC follow a three-tier structure written into Title 75, Chapter 38 of the Pennsylvania Consolidated Statutes. The tiers are General Impairment (0.08% to 0.099%), High BAC (0.10% to 0.159%), and Highest BAC (0.16% and above). A first offense at the lowest tier means probation and a $300 fine with no jail and no license suspension. A first offense at the highest tier means at least 72 hours in jail, a fine up to $5,000, and a year without your license. Prior offenses within the past ten years push every number higher, and a third Highest BAC conviction becomes a first-degree misdemeanor carrying one to five years in prison.¹

The Three BAC Tiers

Your tier is set by the alcohol in your blood or breath within two hours of driving:

General Impairment: 0.08% to 0.099%
High BAC: 0.10% to 0.159%
Highest BAC: 0.16% or above

Drivers impaired by a controlled substance and drivers who refuse chemical testing are penalized at the Highest BAC tier regardless of any actual reading.²

Two groups sit under stricter thresholds. Drivers under 21 can be charged at 0.02% BAC, with penalties matching the High BAC tier rather than General Impairment.³ Commercial drivers can be charged at 0.04%, and Pennsylvania law allows minors, commercial drivers, and school bus drivers to be sentenced under High BAC penalties even when their reading falls in a lower tier.²

First-Offense Penalties by Tier

A first DUI with no prior convictions in the past ten years is an ungraded misdemeanor at every tier. The consequences diverge sharply from there.

General Impairment: 0.08% to 0.099%

Up to six months of probation. A $300 fine. Mandatory alcohol highway safety school. One year of ignition interlock. No mandatory jail. No license suspension.¹

High BAC: 0.10% to 0.159%

A mandatory minimum of 48 consecutive hours in jail, with up to six months possible. A fine of $500 to $5,000. A 12-month license suspension. One year of ignition interlock after reinstatement. Alcohol highway safety school and any court-ordered drug and alcohol treatment are required.¹

Highest BAC: 0.16% and Above (or Controlled Substances, or Test Refusal)

At least 72 consecutive hours in jail. A fine of $1,000 to $5,000. A 12-month license suspension. One year of ignition interlock.¹

Repeat-Offense Penalties and the Ten-Year Lookback

Pennsylvania counts any DUI conviction, adjudication of delinquency, or equivalent out-of-state offense from the past ten years as a prior offense for sentencing.⁴ A prior ARD acceptance within that window also counts.

Second Offense

General Impairment: at least five days in jail, a fine of $300 to $2,500, a 12-month license suspension, one year of ignition interlock.¹
High BAC: a mandatory minimum of 30 days in jail (up to six months), a fine of $750 to $5,000, a 12-month license suspension, one year of ignition interlock.²
Highest BAC: at least 90 days in jail, a fine of $1,500 to $10,000, an 18-month license suspension.²

Third Offense

A third Highest BAC offense is a first-degree misdemeanor. It carries one to five years in prison, a fine of $2,500 to $10,000, an 18-month license suspension, and one year of ignition interlock after reinstatement.²

When a DUI Becomes a Felony

Most Pennsylvania DUIs stay misdemeanors, but two situations escalate the charge. A DUI is a third-degree felony if you have three or more prior DUI offenses within the past ten years, regardless of BAC tier on the new case, or if you have a prior conviction for homicide by vehicle while under the influence.⁵ A fourth or subsequent DUI can be graded as a second-degree felony.

What Refusing the Test Does

Pennsylvania’s implied consent law means that driving on any road in the state counts as agreement to submit to a breath or blood test when an officer has reasonable grounds to suspect impairment.⁶ Refusal does not block a DUI charge, and it adds separate consequences.

A first refusal brings an automatic 12-month PennDOT license suspension. A refusal with a prior refusal suspension or any previous DUI conviction pushes the suspension to 18 months.⁶ These administrative suspensions run even if the underlying DUI is later dismissed or reduced. A license restoration fee of up to $2,000 applies, and sentencing on the DUI itself proceeds at the Highest BAC tier even if your actual reading would have been lower.²

Accelerated Rehabilitative Disposition for a First Offense

If this is your first DUI in ten years and no one was seriously injured, you may qualify for Accelerated Rehabilitative Disposition. ARD is a pre-trial program run by county district attorneys, who have discretion over eligibility, so terms vary across Pennsylvania’s 67 counties.

You are generally ineligible with a prior DUI conviction or ARD acceptance within the past ten years, or if the incident caused serious bodily injury or death.⁷ Some counties add restrictions beyond the statutory floor.

Typical conditions include alcohol highway safety school, a drug and alcohol evaluation, community service, and an arrest-free supervision period lasting roughly six to twelve months. Depending on the BAC tier, participants may face a license suspension of one to twelve months and an ignition interlock requirement. Successful completion ends in dismissal and expungement of the criminal charges. PennDOT still keeps an internal record, and any DUI within ten years of the ARD counts as a prior offense for future sentencing.⁴

Ignition Interlock Applies to Nearly Every Conviction

Ignition interlock is required for virtually every DUI conviction in Pennsylvania, including first offenses at all three BAC tiers.² The device must be installed on every vehicle you own, lease, or operate, and it stays on for one year measured from the date your license is restored.⁸ You must serve at least one year of your license suspension before becoming eligible for an interlock license.

Consequences That Sit Outside the Sentencing Grid

Some consequences a person may assume are part of DUI sentencing are actually separate systems, with their own triggers. Three worth knowing about:

Firearms. A single misdemeanor DUI does not, on its own, take away your gun rights in Pennsylvania. Three DUI convictions within a five-year period prohibit purchase or possession under state law.⁹ Separately, federal law bars anyone convicted of a crime punishable by more than one year from possessing firearms, which reaches Pennsylvania first-degree misdemeanor and felony DUIs.¹⁰

Commercial drivers. Federal regulations disqualify a CDL holder from operating a commercial vehicle for one year on a first DUI, three years on a second, and three years on a first offense if hazardous materials were being hauled.¹¹ That disqualification is on top of the state penalties above.

Travel to Canada. Canadian law treats impaired driving as serious criminality, so a single Pennsylvania DUI conviction can make you inadmissible at the border. Rehabilitation may be available five years after the sentence ends, and a temporary resident permit is possible for urgent travel, but neither is automatic.¹²

1
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3804
2
Commonwealth of Pennsylvania. DUI Legislation
3
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3802
4
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3806
5
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3803
6
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 1547
7
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Chapter 38
8
Commonwealth of Pennsylvania. Ignition Interlock FAQs
9
Pennsylvania General Assembly. Pennsylvania Code Title 18 – Section 6105
10
Office of the Law Revision Counsel. 18 US Code 922 – Unlawful Acts
11
eCFR. 49 CFR 391.15 – Disqualification of Drivers
12
Government of Canada. Canadian Immigration and Citizenship Inadmissibility – Convicted of Driving While Impaired