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Napa County Mosquito Abatement District (NCMAD) has been controlling mosquito populations for the citizens of Napa County since 1925. The Board of Trustees comprised of representatives from each incorporated City and the County-at-large governs the District. There are currently eight employees who are responsible for controlling mosquitoes throughout the County.

NCMAD works closely with other public agencies, park districts and wineries to provide an effective and environmentally sound mosquito control program. The District also works with planning agencies to minimize mosquito production in wetland restoration and enhancement projects.

There are 20 known species of mosquitoes in Napa County.