An Overview of Ontario's DUI Laws and Penalties
Last reviewed: 2026 · Driviology Road Safety Education Team
Quick Answer
Ontario's DUI laws impose immediate roadside licence suspensions for any detectable alcohol in novice drivers and for warn-range or higher BAC in fully licensed drivers, with escalating fines, longer suspensions, and potential criminal charges for repeat offences.
Ontario’s impaired driving framework combines administrative penalties, handled roadside, with criminal penalties that follow a formal charge.
Administrative (Roadside) Penalties
A warn-range BAC results in an immediate short-term licence suspension, even without a criminal charge, escalating with repeat occurrences.
Criminal Penalties
Exceeding the federal legal limit can result in a criminal charge, carrying fines, longer licence suspensions, and potential imprisonment, particularly for repeat offences.
Zero Tolerance for Novice Drivers
G1/G2 drivers and drivers under 21 must maintain zero BAC, with any detectable alcohol triggering an immediate suspension regardless of the amount.