What is the Legal BAC Limit in Cook County, Illinois?

Jul 22, 2026

What is the legal BAC limit in Cook County, Illinois? Attorney Joshua Boardman from Combs Waterkotte discusses everything you need to know about Illinois DUI criminal charges, including first-time DUI, second DUI, Illinois DUI laws, DUI defense strategies, CDL DUI charges, and more.

Combs Waterkotte is a leading criminal defense law firm serving Illinois and Missouri. Our Illinois defense attorneys will fight for your freedom and rights. If you are facing DUI charges anywhere in Illinois, we can help. Call us at (312) 500-HELP 24 hours a day, 7 days a week.

Interview Transcript

Scott Michael Dunn: What is the BAC limit for DUI charges in Cook County or Chicago, Illinois?

Joshua Boardman: Cook County, along with the rest of Illinois, the BAC for personal driving, non-commercial driving, is .08. If you have a commercial driver’s license or a CDL, or if you’re under the age of 21, there are different BAC parameters. For example, with a CDL holder, the BAC that if you are over it and you would be in violation is .04 instead of .08. So they hold certain classifications of drivers more accountable from a BAC standpoint.

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