Mosquito Services

District mosquito services are available at no cost to residents who participate in our program. To participate, landowners must first fill out a one-time landowner permission form. This form is used to indicate to us that we have permission to access your property and which of our services will be permitted.

Mosquito Services

The District will conduct adult and larval mosquito surveillance, test adult mosquitoes for viruses such as West Nile virus that can be transmitted to humans and horses, and treat individual properties for mosquito larvae. The District will also apply larger scale ULV adulticide treatments, but we cannot accept requests for this service. Rather, the District will accept reports of mosquito biting activity. Important information about ULV treatments is given below.

Important Information about Adult Mosquito Treatments

The District only conducts ULV adulticide applications on medium to large scales, such as an entire neighborhood rather than an individual property. In order to have a measurable impact on the adult mosquito population, larger areas must be targeted due to the short efficacy window of our adulticide products and large dispersal of mosquitoes in an area.

For reasons including those stated above, the District does not:

• Conduct single adulticide applications for individual properties.
• Accept adulticide spray requests. We only apply adulticides based on our surveillance data. Residents are encouraged to report significant mosquito biting activity to help us collect information. 
• Adulticide based on a predetermined schedule, a practice that is inconsistent with integrated mosquito management. 
• Adulticide for private events. 

For adulticide ULV treatments for individual properties or private events, the District suggests hiring a private pest control service. 

ULV adulticide treatments are always done in conjunction with intensified efforts to locate and reduce mosquito breeding sites to prevent more adults from emerging. Residential areas neighboring public lands such as the National Parks and Forests, the National Elk Refuge, and others, are often not good candidates for long lasting control of nuisance mosquitoes from ULV treatments because the mosquito source cannot be targeted. Both larval and adult mosquito treatments are not permitted on these public lands, but they can often breed significant amounts of mosquitoes. ULV treatments in these areas historically have limited success due to the short efficacy window of our products and the constant influx of new mosquitoes from these inaccessible breeding habitats. Adulticide treatments are made in these locations, but the District cannot guarantee long-lasting effectiveness. 

In the case of high West Nile virus activity, ULV treatments are the only method available, however, to rapidly reduce the number of infectious mosquitoes in an area.