Proactive Storm Drain Larviciding

Picture of the bottom of a catch basin full of trash
Storm drains, also called storm sewers or storm water catch basins, are located throughout the county. Storm drains usually drain well and do not present a problem as far as mosquito breeding; however, some may have structural problems or may be partially blocked, retain water and produce excellent breeding sites for the mosquito vectors of West Nile virus. This is particularly common in older communities in the County.

The Health Department treats storm drains throughout the County with a larvicide, an insecticide used to kill mosquito larvae, in programmed cycles aimed at reducing mosquito populations that breed in this environment. The first treatment cycle typically begins in May each year, with the number and magnitude of each cycle dependent on climatic factors and mosquito surveillance results.

Contact Fairfax County: Phone, Email or Twitter | Main Address: 12000 Government Center Parkway, Fairfax, VA 22035
Technical Questions: Web Administrator

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