Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 23, 2026 and October 2, 2026.
Crystal Lake, Illinois, in McHenry County, has about 42,000 residents (2024 Census Bureau estimate). A DUI arrest in Crystal Lake starts two cases, a criminal case in the Circuit Court of McHenry County and a license case before the Secretary of State, and leaves three records. This guide follows the arrest from the roadside to the court file and the driving record.
This guide covers the law, the arrest, booking, the court case, the license case, the records and common questions.
Related guides: Crystal Lake public records, McHenry County DUI, Crystal Lake arrest records, Crystal Lake warrants, Crystal Lake inmate search, Crystal Lake criminal records, Illinois arrest records and Illinois inmate search.
The DUI Law in Illinois
In Illinois the offense is DUI, and the limit is 0.08.
Driving in Illinois is consent to a breath or blood test when an officer has cause to suspect DUI; the license case that follows a refusal or a failed test is run by the Secretary of State, separately from the criminal case.
Illinois sets no time limit on prior offenses: every earlier conviction counts toward a repeat charge.
Who Makes DUI Arrests in Crystal Lake
The McHenry County Sheriff's Office and the agency that reports for Crystal Lake (filed by the FBI as Crystal Lake Police Department) make the DUI arrests in and around Crystal Lake.
The FBI's agency list also places these agencies in McHenry County: McHenry County College (campus police); the McHenry County Conservation District and the Crystal Lake Park District (other agency).
Together, the 21 agencies in McHenry County with all twelve months of 2025 on file reported 4,544 arrests to the FBI that year, all offenses together; the FBI's count for McHenry County does not break DUI out.
The Lakemoor Police Department, the Fox Lake Police Department and the Barrington Hills Police Department are each listed by the FBI across several counties including McHenry County, so their arrests are not broken out for McHenry County here.
Booking After a DUI Arrest in Crystal Lake
A driver arrested for DUI and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the McHenry County Sheriff's Office, held about 380 people on an average day in 2024 by the Vera Institute of Justice's count and has a jail page SearchSystems verified at mchenrysheriff.org. The Crystal Lake inmate search guide covers the jail in full.
The Court Case
A DUI charge from Crystal Lake is brought by the State's Attorney in the Circuit Court of McHenry County.
The State's Attorney's page SearchSystems verified is at mchenrycountyil.gov, phone (815) 334-4159.
The court records page SearchSystems verified for the county is at caseinfo.mchenrycountyil.gov/PublicCaseAccess.
Illinois has no single public index of every trial court case; each court's records are looked up through that court.
The License Case
A DUI arrest starts two cases: the criminal one above and an administrative one over the license, run by the Secretary of State. The driving record, kept by the Illinois Secretary of State, carries the result of both.
The Records a DUI Leaves
- The arrest report: from the agency that made the arrest, under the Illinois Freedom of Information Act.
- The court file: from the Circuit Court of McHenry County, kept by the Circuit Clerk.
- The driving record: from the Illinois Secretary of State.
More on each: Crystal Lake arrest records, Crystal Lake police reports and Crystal Lake court records.
Frequently Asked Questions
What is the DUI limit in Illinois?
0.08 percent blood alcohol.
Where is a DUI case from Crystal Lake heard?
In the Circuit Court of McHenry County, brought by the State's Attorney.
Where is a person arrested for DUI in Crystal Lake held?
At the county jail, run by the McHenry County Sheriff's Office, if kept in custody.
Who handles the license after a DUI arrest in Illinois?
The Secretary of State, in an administrative case separate from the court case.
How long does a DUI count as a prior in Illinois?
There is no time limit; every prior conviction counts.
Is this the official Crystal Lake website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.