Our Treatment Zones

The St. Charles County Mosquito Control program works with area municipalities and residents to reduce the mosquito population in our community and decrease the risk of mosquito-borne disease. The program controls immature and adult mosquitoes by seeking out and eliminating breeding sites and by using biological controls or insecticides.

The Division of Environmental Health and Protection contracts with several municipalities* to minimize mosquito populations in their community.  If you live in unincorporated St. Charles County or within the city limits of Augusta, Cottleville, Dardenne Prairie, Flint Hill, Lake Saint Louis, Portage des Sioux, Weldon Spring Heights and Wentzville, please use our online treatment request service.

Map of St. Charles County
*If you live within the city limits of O’Fallon, St. Charles or St. Peters, please contact representatives in your city hall regarding mosquito abatement and local spraying efforts.