Kick off autumn with a new art event at O'Fallon's O'Day Park

Fine artists and high-end crafters will be on-hand to exhibit and sell their work. The event also features craft beer and wine tastings, artisan food vendors and live music at O'Day Ampitheater. Admisssion and parking are free at this brand-new event.

Performances on August 23-25 and August 30-September 1
Project to address congested intersections and delays on I-70 through O’Fallon

Improvements are underway to the interchange at I-70 and Highway K/Main Street, with relief for congestion on K near I-70 and better traffic flow from T.R. Hughes Blvd. through Woodlawn Ave. Phase 1 of this project will focus on the area from T.R. Hughes to Main St./Hwy. K. Construction continues through October 2019.

1 mile south of I-64 on DD

Bring the family to experience O'Fallon's newest park, including the Adventure Playground, pavilions, and walking trails. Plus, checkout our schedule of free events this summer!

Free Events at
O'Day Park
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Upcoming Events

25 Aug
26 Aug
Municipal Court
5:00 PM - 6:00 PM
28 Aug
Municipal Court
9:00 AM - 10:00 AM
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O’Fallon wins best-tasting water in Missouri

The City of O’Fallon was named the winner of the “2019 Water Taste Test” by the Missouri Section of the American Water Works Association (AWWA). Each year, the AWWA Conference receives submissions for the best-tasting water in Missouri. This year’s award was presented to O’Fallon Water at AWWA’s annual conference.

O’Fallon’s water system consists of a 6.0 million gallon per day, state-of-the-art RO/Membrane Water Treatment Plant with five alluvial wells. This water supply and treatment facility is complimented with four additional deep wells, three booster pump stations, high service pumps, four elevated storage tanks, three ground storage tanks and over 170 miles of cast iron, ductile iron and PVC distribution lines. The system serves nearly 13,000 customers. Learn more about Water & Sewer.

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O'Fallon's mosquito control program

Aside from being itchy and annoying mosquitoes can carry Mosquito-borne diseases. Although relatively rare, there are cases of mosquito-borne illness reported every year throughout the United States. For more information mosquito-borne illnesses, please visit Even though illnesses are rare here, the fact remains, mosquitoes are annoying, can disrupt outdoor plans, force people indoors and hurt!

The City of O’Fallon has a mosquito control program in place. Our dedicated professionals will treat any street or neighborhood of the City upon request of the residents or Homeowners’ Association. To request a spray, just call 636-379-5553 or email Please note: Our trucks will spray as they drive down the street. Our crews cannot treat individual yards. Each call will result in a single spray. To have your area treated a second time, you must call again. For more information and tips to keep your yard mosquito free, please visit