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Spray Notices

Treatment Information

Dates of mosquito control treatments are subject to change and are based on multiple factors including weather and mosquito abundance. Advance notification of the week a treatment may occur is provided to the public via this page, our Facebook page, and to the media.

Spray Notices

NOTICE ground mosquito treatment

Ground Adulticide Mission | Williams County | Wildrose | WCVCD | 7/1/25

Posted on July 1, 2025

The Williams County Vector Control District (WCVCD) will conduct a ground ULV (Ultra-Low Volume) mosquito control spray in the community of Wildrose on the evening of Tuesday, July 1, 2025, weather permitting. The application will take place after sunset to target adult mosquito populations. The product being used for this operation is Zenivex, which is...
NOTICE ground and aerial treatment

Ground and Aerial Adulticide Missions | Williams County | WCVCD | 7/1/25-7/5/25

Posted on July 1, 2025

The Williams County Vector Control District (WCVCD) will be conducting both aerial and ground mosquito control applications across the county during the week of July 1, 2025, weather permitting. If conditions do not allow, applications will be rescheduled for a later date to ensure safety and effectiveness. Target areas currently include Trenton and Williston, with...
Image with a mosquito and the words NOTICE aerial mosquito control treatment

Aerial Adulticide | Williston and Trenton | WCVCD | 6/27/2025 -6/28/2025

Posted on June 26, 2025

Weather permitting, the Williams County Vector Control District (WCVCD) will be conducting an aerial application in Williston and Trenton over the weekend of 6/27/25 - 6/28/25 to control the mosquito population. WCVCD will be using Imperium for this adulticide mission, which is a product approved for use by the Environmental Protection Agency (EPA). For more...
NOTICE ground mosquito treatment

Ground Adulticide | Williston Blocks 4 and 8 | WCVCD | 6/25/2025

Posted on June 25, 2025

The Williams County Vector Control District (WCVCD) will be conducting a targeted ground adulticide mission in Williston Spray Blocks 4 and 8 on the evening of June 25, 2025, weather permitting. For safety and effectiveness, it will be rescheduled to later this week if conditions do not allow. Residents are reminded to please stay at...
NOTICE ground mosquito treatment

Ground Adulticide | Trenton and Williston | WCVCD | 6/24/2025 – 6/30/2025

Posted on June 24, 2025

The Williams County Vector Control District (WCVCD) will be conducting a ground adulticide treatments between 6/24/2025 - 6/30/2025 in Trenton and Williston Spray Blocks 3 and 7. Weather permitting, the treatment will occur near sunset. Please maintain a distance of at least 300 feet behind Vector Control trucks when they are fogging. The WCVCD will...
NOTICE ground mosquito treatment

Ground Adulticide | Trenton | WCVCD | 6/19/2025

Posted on June 19, 2025

The Williams County Vector Control District (WCVCD) will be conducting a ground adulticide treatments on Thursday, June 19 in Trenton. Weather permitting, the treatment will occur near sunset. Please maintain a distance of at least 300 feet behind Vector Control trucks when they are fogging. The WCVCD will be using DeltaGard, which contains the active ingredient...
NOTICE ground and aerial treatment

Adulticide Treatments | Williams County | WCVCD | 6/17 – 6/18/2025

Posted on June 17, 2025

The Williams County Vector Control District (WCVCD) will be conducting ground and aerial adulticide treatments in Ray, Trenton, and Williston on Tuesday, June 17 and Wednesday, June 18, weather and conditions permitting. On June 17, WCVCD will be conducting ground adulticide treatments in Ray and Trenton. Weather permitting, treatments will occur near sunset. Please maintain a...
NOTICE ground and aerial treatment

Multiple Adulticide Missions | Williams County | WCVCD | 6/10/25-6/17/25

Posted on June 10, 2025

The Williams County Vector Control District plans to conduct three separate adulticide treatments between 6/10/25-6/17/25 across the County. Citywide aerial adulticide missions in Williston and Grenora area using Imperium will begin as early as the afternoon of 6/11/25. Ground adulticide mission in Trenton/ Trenton Park area using DeltaGard will begin as early as the night...

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