Although the pesticides used for adult mosquito control may be toxic to bees, at the ultra-low-volume (ULV) application rates and the fact that they are applied late at night when honey bees are normally in their hives, there should be no exposure or impact to local honeybees.
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The San Mateo County Mosquito & Vector Control District (SMCMVCD) handles mosquito control for all of San Mateo County, including the 20 independent cities plus all unincorporated County areas. It is an independent special district, which is a type of local government entity that delivers specific services to citizens within its boundaries (similar to the Menlo Park Fire Control District). The District’s mission is, “To safeguard the health and comfort of the citizens of San Mateo County through a planned program to monitor and reduce mosquitoes and other vectors." The District is governed by a Board of Trustees consisting of one resident from each city. The District can be reached at 650-344-8592 or online at www.smcmvcd.org.
The spraying will take place in areas of concern, as determined by the San Mateo County Mosquito and Vector Control District’s mosquito and disease surveillance programs. Their trained and certified technicians use a variety of surveillance techniques and treatment criteria to ensure effective mosquito control with the least amount of risk to our residents and our environment. The District’s website will also show a map of the spray zone. You can visit the District’s website at
No. The pesticides chosen by the District are used to target a variety of mosquitoes that can transmit West Nile Virus as well as other diseases.
Although mosquito control pesticides pose very low risks, some people may prefer to avoid or even further minimize exposure. People who suffer from chemical sensitivities or breathing conditions such as asthma can reduce their potential for exposure by staying indoors during the application period and may want to consult their physician or local health department for more information.
Inquiries concerning pesticides can be directed to the EPA (visit: http://www.epa.gov ). More information can also be found at the National Pesticide Information Center – NPIC (http://npic.orst.edu) or by calling toll free 1-800 858-7378. The District also posts information on their website at
For more information and to sign-up for mosquito spraying / fogging alerts, please visit the San Mateo County Mosquito and Vector Control District's website at