Reviewed and updated October 11, 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 11, 2026.
LaSalle County, Illinois, has about 108,000 residents (2024 Census Bureau estimate). A DUI arrest in LaSalle County starts two cases, a criminal case in the Circuit Court of LaSalle 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: LaSalle County public records, LaSalle County arrest records, LaSalle County warrants, LaSalle County inmate search, LaSalle County 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 LaSalle County
The La Salle County Sheriff's Office and the agencies that report for Ottawa, Streator, Peru, LaSalle, Mendota, Marseilles and nine more cities make the DUI arrests in LaSalle County.
The FBI's agency list also places one more agency in LaSalle County: Tri-County Drug Enforcement Narcotics Team (other agency).
Together, the 13 agencies in LaSalle County with all twelve months of 2025 on file reported 2,788 arrests to the FBI that year, all offenses together; the FBI's count for LaSalle County does not break DUI out.
The Somonauk Police Department is listed by the FBI across two counties including LaSalle County, so its arrests are not broken out for LaSalle County here.
Booking After a DUI Arrest in LaSalle County
A driver arrested for DUI and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the La Salle County Sheriff's Office, held about 110 people on an average day in 2019 by the Vera Institute of Justice's count and has a custody page SearchSystems verified at lasalleso.com/inmateSearch. The LaSalle County inmate search guide covers the jail in full.
The Court Case
The State's Attorney files the charge, and the case is heard in the Circuit Court of LaSalle County.
The State's Attorney's page SearchSystems verified is at lasallecountyil.gov, phone 815-434-8340.
The court records page SearchSystems verified for the county is at lasallecounty.com/i-want-to/request/court-transcripts, phone 815-434-0786.
Illinois has no single public index of every trial court case; each court's records are looked up through that court.
The License Case
The court case is only half the record. The Secretary of State runs a separate administrative case over the license, which can suspend it before the criminal case is decided, and the Illinois Secretary of State keeps the driving record the conviction goes on.
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 LaSalle County, kept by the Circuit Clerk.
- The driving record: from the Illinois Secretary of State.
More on each: LaSalle County arrest records, LaSalle County police reports and LaSalle County court records.
Frequently Asked Questions
What is the DUI limit in Illinois?
0.08 percent blood alcohol.
Where is a DUI case from LaSalle County heard?
In the Circuit Court of LaSalle County, brought by the State's Attorney. The court records page SearchSystems verified for the county is at lasallecounty.com.
Where is a person arrested for DUI in LaSalle County held?
At the county jail, run by the La Salle 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 LaSalle County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.