Spray Notices

Ground Adulticide Treatment | Williston | WCVCD | 5/13/2025

Posted on May 13, 2025

5/13/2025: Williams County Vector Control District (WCVCD) will be conducting a targeted ground adulticide mosquito spray mission tonight, Tuesday, May 13, in Williston’s Spray Block 8, weather permitting. Link to Spray Block Map The department will move forward with spraying tonight if wind speeds remain between 12–15 MPH. For safety and effectiveness, it will be...

Ground Adulticide Treatment | Williston | WCVCD | 8/22/2024

Posted on August 22, 2024

8/22/2024: Williams County Vector Control District (WCVCD) will be conducting an ground adulticide tonight, August 22, 2024, in City of Williston Spray Blocks 3 and 8. Weather and conditions permitting, the treatment will begin after sunset. Residents are reminded to please stay at least 300 feet away from a Vector Control truck while it is...

Aerial Adulticide Treatment | Williston and Watford City | WCVCD and USAFR | 8/6 – 8/8/2024

Posted on August 1, 2024

8/1/2024: In collaboration with the Williams County Vector Control District (WCVCD), the United States Air Force Reserve (USAFR) Youngstown Air Reserve Station 910th Airlift Wing will be conducting an adulticide mission over Williston and Watford City, weather and conditions permitting, between August 6 and August 8, 2024. Large military aircraft will be flying at low...

Ground Adulticide Treatment | Ray & Williston | WCVCD | 8/1/2024

Posted on August 1, 2024

8/1/2024: Williams County Vector Control District (WCVCD) will be conducting ground adulticide treatments tonight, August 1, 2024, in Williston Spray Block 7 and in Ray. Weather and conditions permitting, the treatment will begin after sunset. Residents are reminded to please stay at least 300 feet away from a Vector Control truck while it is fogging....

Ground Adulticide Treatment | Williston | WCVCD | 7/31/2024

Posted on July 31, 2024

7/31/2024: Due to the detection of West Nile Virus in an isolated pool of mosquitoes, Williams County Vector Control District (WCVCD) will be conducting an ground adulticide tonight, July 31, 2024, in Spray Blocks 2, 3, and 4 in the southeastern area of the City of Williston. Weather and conditions permitting, the treatment will begin...

Ground Adulticide Treatment | Trenton & Williston | WCVCD | 7/23/2024

Posted on July 23, 2024

7/23/2024: The Williams County Vector Control District (WCVCD) will be conducting ground adulticide treatments, after dusk, weather and conditions permitting on Tuesday, July 23 through Thursday, July 25, in City of Williston Blocks 8, 13, and 14, rural Williston near the south end of 130th Rd NW, and in Trenton. Residents are reminded to please...

Ground Adulticide Treatment | Williston | WCVCD | 7/19/2024

Posted on July 19, 2024

7/19/2024: The Williams County Vector Control District (WCVCD) will conduct a ground adulticide in City of Williston Block 3 on Sunday, July 21, 2024, after dusk, weather and conditions permitting. Residents are reminded to please stay at least 300 feet away from a Vector Control truck while it is fogging. Link to Spray Block Map...

Aerial Adulticide Treatment | WCVCD and USAFR | 7/15 – 7/19/2024

Posted on July 17, 2024

UPDATE 7/17/2024: Due to aircraft issues, the USAFR will be unable to complete mosquito treatments this week for Williston and Watford City. Aerial adulticide treatments will instead be completed by the Williams County Vector Control District (WCVCD). Weather and conditions permitting, treatment for Williston will be completed tonight, Wednesday, July 17 and treatment for Watford...