The Williams County Vector Control District (WCVCD) will be conducting ground adulticide treatments in Williston, Trenton, and the South River Zone after sunset on Thursday, July 24, 2025.
WCVCD will conduct a ULV treatment targeting Williston’s Spray Blocks 8 and 10 using the product DeltaGard (which has an active ingredient of Deltamethrin). The district will also conduct a ground spray treatment in Trenton and the South River Zone using Zenivex E20 (which has the active ingredient of Etofenprox). Both products are approved for use in residential areas by the Environmental Protection Agency (EPA).
Please find the Williston Spray Block Map at https://arcg.is/C9OHq0.
Residents are asked to maintain a distance of at least 300 feet behind Vector Control trucks when they are fogging.
To avoid mosquito bites, residents are advised to take extra precautions when spending time outdoors during the hours of dusk to dawn during the summer months. Wearing long sleeve tight knit shirts and long pants, limiting time outdoors during these times, and using a mosquito repellent such as DEET, Picardin, or oil of lemon eucalyptus are good actions to take to prevent bites. Residents can help prevent mosquito re-population by eliminating standing water on their property.
For more information, and a list of all notices, please visit the Vector Control website.