If necessary, St. Louis County will do mosquito fogging on Sunday nights starting Memorial Day Weekend.  If you want to know what locations are scheduled, please call (314) 615-0680. 

The St. Louis County Department of Health helps alleviate the mosquito problems in several different ways:


To monitor and treat standing water on public property and easements. This includes ditches, drainage areas, non-flowing creek systems and sewer catch basins. Another source of disease carrying mosquitoes is standing water on private property. Often, residents don't realize their role in this issue. The City of Twin Oaks encourages and tries to educate residents on the removal or treatment of standing water on their property. Residents may use commercially available products that are safe and effective to treat birdbaths, ornamental ponds, swimming pool covers, etc. for mosquito larva. Unwanted water sources should be emptied. Municipal nuisance ordinances are a tool in minimizing potential breeding sites on private property.

Mosquito Disease Monitoring

Traps are set in specific habitats, strategically located throughout the County. CULEX is a targeted mosquito, which is the main vector for West Nile Virus (WNV) in the St. Louis area. Captured mosquitoes are counted and tested for WNV. Mosquito trap results are among the factors used in making adulticide spraying decisions.


The dynamics of mosquito control changed with the arrival of West Nile Virus (WNV) in the St. Louis Area. Disease control and prevention is the public health priority for St. Louis County. Following national recommended protocol, we base our spraying decisions on several factors: mosquito trap results including species, quantity collected and positive WNV test results; human and animal WNV positive cases; complaints and weather. Prior to WNV, spraying was driven by complaints, but that is no longer the case since the level of tolerance for mosquitoes varies dramatically among individuals.


For more information regarding St. Louis County's Vector Control Program, please call 314-615-0680.  To hear specific information regarding locations being sprayed daily, a recorded message is available at 314-615-4284.  This message is updated daily between 4pm and 6pm.  Spraying begins at sunset.

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