← Illinois alcohol laws›DUI / DWI Limits

Illinois DUI / DWI Limits (2026)

Info: In Illinois the DUI limit for drivers 21 and older is 0.08% blood alcohol, and drivers under 21 are held to a zero-tolerance limit of 0.02% — any trace can trigger license action.

InfoVerified May 31, 2026

Alcohol laws change at state, county and city lines.Track them in the free LawLert iPhone app: it alerts you when you cross into a state where they differ, or into a dry county where LawLert has the local rule, and when they change in your state. No account.Get the app

Official source: ilga.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

DUI / DWI Limits in states bordering Illinois

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

IndianaInfo
In Indiana the OWI limit for drivers 21 and older is 0.08% blood alcohol (IC 9-30-5-1), and the limit for drivers under 21 is 0.02%.
Verified May 31, 2026 · Source: in.gov · Full Indiana rule →
IowaInfo
In Iowa the OWI limit for drivers 21 and older is 0.08% blood alcohol (Iowa Code 321J.2), and the limit for drivers under 21 is 0.02%.
Verified May 31, 2026 · Source: legis.iowa.gov · Full Iowa rule →
KentuckyInfo
In Kentucky the adult per se limit is 0.08% blood alcohol (KRS 189A.010), commercial drivers are limited to 0.04%, and drivers under 21 are held to a zero-tolerance limit of 0.02%.
Verified May 31, 2026 · Source: apps.legislature.ky.gov · Full Kentucky rule →
MissouriInfo
In Missouri the adult DWI limit is 0.08% blood alcohol, and drivers under 21 are held to the "abuse and lose" zero-tolerance limit of 0.02%.
Verified May 31, 2026 · Source: modot.org · Full Missouri rule →
WisconsinInfo
In Wisconsin the limit for adults is 0.08% blood alcohol (per se / "PAC") for OWI, and drivers under 21 are under the "Absolute Sobriety" zero-tolerance rule at 0.00%.
Verified May 31, 2026 · Source: revenue.wi.gov · Full Wisconsin rule →

Don't get caught off guardCross into a state where this law is different and the free iPhone app tells you what changed, even with the app closed. It also alerts you when a law you track changes where you live. No account.Get the free app

Track this law — get alerted when it changes

We watch the official sources behind Illinois alcohol rules. If a tracked rule changes, you get one short email — never more than one a week. Free, unsubscribe anytime.