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.
Swansea, Illinois, in St. Clair County, has about 14,000 residents (2024 Census Bureau estimate). A DUI arrest in Swansea starts two cases, a criminal case in the Circuit Court of St. Clair 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: Swansea public records, St. Clair County DUI, Swansea arrest records, Swansea warrants, Swansea inmate search, Swansea 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 Swansea
The St. Clair County Sheriff's Office and the agency that reports for Swansea (filed by the FBI as Swansea Police Department) make the DUI arrests in and around Swansea.
The FBI's agency list also places these agencies in St. Clair County: Alton and Southern Railway and Union Pacific Railroad in St. Clair County (other agency); Southwestern Illinois College (campus police).
Together, the 17 agencies in St. Clair County with all twelve months of 2025 on file reported 6,114 arrests to the FBI that year, all offenses together; the FBI's count for St. Clair County does not break DUI out.
The Columbia Police Department, the New Baden Police Department, the Collinsville Police Department and one more are each listed by the FBI across several counties including St. Clair County, so their arrests are not broken out for St. Clair County here.
Booking After a DUI Arrest in Swansea
A driver arrested for DUI and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the St. Clair County Sheriff's Office, held about 450 people on an average day in 2021 by the Vera Institute of Justice's count and has a jail page SearchSystems verified at co.st-clair.il.us/departments/sheriffs-department, phone (618) 277-3505. The Swansea inmate search guide covers the jail in full.
The Court Case
A DUI charge from Swansea is brought by the State's Attorney in the Circuit Court of St. Clair County.
The State's Attorney's page SearchSystems verified is at co.st-clair.il.us/departments/states-attorney, phone (618) 277-3892.
The court records page SearchSystems verified for the county is at co.st-clair.il.us/WebDocuments/Departments/CircuitClerk/AttorneyRes....
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 St. Clair County, kept by the Circuit Clerk.
- The driving record: from the Illinois Secretary of State.
More on each: Swansea arrest records and Swansea court records.
Frequently Asked Questions
What is the DUI limit in Illinois?
0.08 percent blood alcohol.
Where is a DUI case from Swansea heard?
In the Circuit Court of St. Clair County, brought by the State's Attorney. The court records page SearchSystems verified for the county is at co.st-clair.il.us.
Where is a person arrested for DUI in Swansea held?
At the county jail, run by the St. Clair 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 Swansea 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.