Areas of western Placer County are scheduled for treatment for significant mosquito and West Nile virus activity. An EPA-approved mosquito adulticide will be applied in an Ultra Low Volume (ULV) fog by airplane to target adult mosquitoes.
- Placer County west border – areas west of Dowd Road to the western county border, and between Wise Road in the north and Baseline Road in the south. See map of area
Since several factors affect treatment activities, such as weather and wind conditions, the District encourages Placer residents to check this website at for any changes to the spraying schedule.