ST. CHARLES, Ill. (Aug. 5, 2025) – West Nile-positive mosquitoes were identified in area traps, including in St. Charles. In the interest of public health, St. Charles is joining its neighbors in conducting a citywide mosquito spray the evening of Aug. 6, weather permitting.
Clarke, the mosquito control vendor for the City of St. Charles, uses a synthetic treatment that is safe for humans and pets. However, people with a respiratory condition are advised to stay indoors and close the windows during the application.
More information about the City’s Mosquito Control Program is on the City website.
Product Information
For information about the treatment Clarke uses, visit their website.
Get Notified of an Upcoming Application
Visit the Clarke Customer Portal at clarkeportal.com to sign up for notifications of an upcoming spray, or to report standing water and high mosquito annoyance in the area.
Mosquito Hotline
For questions about Clarke’s mosquito control products or methods, call Clarke’s Mosquito Hotline at 1.800.942.2555.
Prevent Mosquito Bites
To prevent bites, use insect repellent, avoid being outdoors during dawn and dusk hours when mosquitoes are most active, and wear long sleeves.
What You Can Do to Reduce Mosquito Population in Your Yard
1. Discard buckets or any water-holding containers outside.
2. Fill in or drain any low places in the yard.
3.Cover trash containers to keep out rainwater.
4. Repair leaky pipes and outside faucets.
5. Empty plastic wading pools at least once each week and store indoors when not in use.
6. Make sure your backyard pool is properly cared for—especially when on vacation.
7. Change the water in birdbaths and planters frequently.
8. Keep grass cut short and shrubbery well-trimmed around the house.