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 on September 23, 2026.
St. Charles County, Missouri, has about 424,000 residents (2024 Census Bureau estimate). A DWI arrest in St. Charles County starts two cases, a criminal case in the St. Charles County Circuit Court and a license case before the Department of Revenue, 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: St. Charles County public records, St. Charles County arrest records, St. Charles County warrants, St. Charles County criminal records, St. Charles County court records, Missouri arrest records and Missouri inmate search.
The DWI Law in Missouri
In Missouri the offense is DWI, and the limit is 0.08.
Driving in Missouri is consent to a breath or blood test when an officer has cause to suspect DWI; the license case that follows a refusal or a failed test is run by the Department of Revenue, separately from the criminal case.
Who Makes DWI Arrests in St. Charles County
The St. Charles County Sheriff's Office, the St. Charles County Police Department and the agencies that report for O'Fallon, St. Charles, St. Peters, Wentzville, Lake St. Louis, Cottleville and one more cities make the DWI arrests in St. Charles County.
The FBI's agency list also places these agencies in St. Charles County: St. Charles Regional Drug Task Force (other agency); St. Charles Community College (campus police).
Together, the seven agencies in St. Charles County with all twelve months of 2025 on file reported 7,625 arrests to the FBI that year, all offenses together; the FBI's count for St. Charles County does not break DWI out.
Booking After a DWI Arrest in St. Charles County
A driver arrested for DWI and kept in custody goes to the county jail, whichever agency made the arrest. The jail, run by the St. Charles County Sheriff's Office, held about 450 people on an average day in 2019 by the Vera Institute of Justice's count.
The Court Case
The Prosecuting Attorney files the charge, and the case is heard in the St. Charles County Circuit Court.
The Prosecuting Attorney's page SearchSystems verified is at stcharlescitymo.gov/839/Prosecuting-Attorney, phone (636) 940-4636.
The court records page SearchSystems verified for the county is at stcharlescitymo.gov/176/Municipal-Courts, phone (636) 949-3378. That page belongs to a lower court, not to the St. Charles County Circuit Court.
Statewide, Case.net is the Missouri courts' free statewide case search.
The License Case
The court case is only half the record. The Department of Revenue runs a separate administrative case over the license, which can suspend it before the criminal case is decided, and the Missouri Department of Revenue Driver License Bureau keeps the driving record the conviction goes on.
The Records a DWI Leaves
- The arrest report: from the agency that made the arrest, under the Missouri Sunshine Law.
- The court file: from the St. Charles County Circuit Court, kept by the Circuit Clerk.
- The driving record: from the Missouri Department of Revenue Driver License Bureau.
More on each: St. Charles County arrest records, St. Charles County police reports and St. Charles County court records.
Frequently Asked Questions
What is the DWI limit in Missouri?
0.08 percent blood alcohol.
Where is a DWI case from St. Charles County heard?
In the St. Charles County Circuit Court, brought by the Prosecuting Attorney. The court records page SearchSystems verified for the county is at stcharlescitymo.gov/176/Municipal-Courts.
Where is a person arrested for DWI in St. Charles County held?
At the county jail, run by the St. Charles County Sheriff's Office, if kept in custody.
Who handles the license after a DWI arrest in Missouri?
The Department of Revenue, in an administrative case separate from the court case.
Is this the official St. Charles 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.