*Revised – additional night of treatment on Thursday, July 31
The agricultural areas of western Placer County are scheduled for treatment. An EPA-registered mosquito adulticide will be applied in an Ultra-low Volume (ULV) fog by aircraft in an effort to address increased mosquito populations and very high West Nile virus activity.
- Western Placer County agricultural areas. Middle block, will be treated Thursday night. South block, west of Roseville, will be treated Friday and Saturday evening. Please refer to the map below.
Since several factors affect treatment activities, such as weather and wind conditions, the District encourages Placer residents to check this website regularly for any changes to the spraying schedule. For an overview of our mosquito control programs, you may view the District video.