09/01/2026
PLANNED AERIAL MOSQUITO TREATMENT – THURSDAY, September 3rd, 2026
Due to increased West Nile virus activity, the Merced County Mosquito Abatement District will conduct an aerial mosquito treatment after sunset on Thursday, September 3rd, 2026.
The treatment area includes:
📍Merced
📍Atwater
📍Winton
📍Livingston
📍Delhi
📍Hilmar
So far this season, the District has found 58 West Nile virus-positive mosquito samples, 2 positive dead birds, and 1 positive horse in Merced County, with increased activity in the treatment area. This treatment will quickly reduce the number of adult mosquitoes and help lower the risk of West Nile virus spreading.
The District has contracted with VDCI Aerial Services to conduct the treatment. Residents may see a small twin-engine aircraft flying about 200–300 feet above the treatment area after sunset.
About the treatment:
âś…Aerial treatments are used when West Nile virus activity is found across a large area. The treatment is the same type used by mosquito control trucks, but aircraft allow the District to treat multiple communities quickly.
âś…The product used is EPA-registered and approved for public health mosquito control. When used according to the label, it is safe for use around people and pets. Residents may choose to stay indoors during the treatment as an extra precaution.
Help protect yourself from West Nile virus:
🦟Use an EPA-registered insect repellent with 30% DEET, 20% Picaridin, or Oil of Lemon Eucalyptus.
đź’§Dump and drain standing water around your home every week.
📣Stay informed about current West Nile virus activity and treatment notices by visiting mcmosquito.org and following the Merced County Mosquito Abatement District on social media.