1. Vector Control
  2. Spray Notices

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 of aerial adulticide campaign with image showing a mosquito crossed out

Aerial Adulticide | Williston Vector Control District | 8/25/23 – 8/29/23

Posted on August 24, 2023

8/11/2023: The Williston Vector Control District is tentatively scheduled to conduct aerial adulticide treatments for the Williston Spray Blocks between Friday, August 25 and Tuesday, August 29, weather and conditions permitting. Treatment will take place near sunset. Updates, as they are available, will be posted on this page. Williston Vector Control uses Zenivex E20 for...
Notice of aerial adulticide campaign with image showing a mosquito crossed out

Aerial Adulticide | Williston Vector Control District | 8/17/23 – 8/22/23

Posted on August 16, 2023

8/11/2023: The Williston Vector Control District is tentatively scheduled to conduct aerial adulticide treatments for the Williston Spray Blocks between Thursday, August 17 and Tuesday, August 22, weather and conditions permitting. Treatment will take place near sunset. Updates, as they are available, will be posted on this page. Williston Vector Control uses Zenivex E20 for...
Notice of aerial adulticide campaign with image showing a mosquito crossed out

Aerial Adulticide | Williston Vector Control District | 8/11/23 – 8/15/23

Posted on August 10, 2023

8/10/2023: The Williston Vector Control District is tentatively scheduled to conduct aerial adulticide treatments in the Trenton and Williston areas, between Friday, August 11 and Tuesday, August 15, weather and conditions permitting. Treatment will take place near sunset. Updates, as they are available, will be posted on this page. Williston Vector Control uses Zenivex E20...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Aerial and Ground Adulticide | Williston Vector Control District | 8/4/23 – 8/10/23

Posted on August 3, 2023

8/3/2023: The Williston Vector Control District is tentatively scheduled to conduct aerial and ground adulticide treatments across the entire District, including Williston, Trenton, Ray, Epping, and Grenora, between Friday, August 4 and Thursday, August 10. Treatments will take place near sunset, weather and conditions permitting. Citizens are reminded to please stay at least 300 feet...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Aerial and Ground Adulticide | Williston Vector Control District | 7/28/23 – 8/3/23

Posted on July 27, 2023

7/31/2023: An aerial treatment was completed for Williston. 7/27/2023: The Williston Vector Control District is tentatively scheduled to conduct aerial and ground adulticide treatments across the entire District, including Williston, Trenton, Ray, Epping, and Grenora, between Friday, July 28 and Thursday, August 3. Treatments will take place near sunset, weather and conditions permitting. Citizens are...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Aerial and Ground Adulticide | Williston Vector Control District | 7/21/23 – 7/27/23

Posted on July 20, 2023

7/26/203: Weather and conditions permitting, an aerial treatment will be conducted for Williston tonight, 7/26. If conditions are unfavorable, then an attempt on 7/27 will be made. Treatment will take place near sunset. 7/22/2023: An aerial treatment was completed for Williston. 7/20/2023: The Williston Vector Control District is tentatively scheduled to conduct aerial and ground adulticide...
Notice of ground and aerial adulticide campaign with image showing a mosquito crossed out

Aerial and Ground Adulticide | Williston Vector Control District | 7/13/23 – 7/19/2023

Posted on July 14, 2023

UPDATE | 7/14/2023: Weather and conditions permitting, the Williston Vector Control District will conduct the following ground adulticide treatments: 7/15/2023: Epping and Ray Spray Blocks 7/16/2023: Grenora Spray Block (not completed due to weather) UPDATE | 7/13/2023: Weather and conditions permitting, the Williston Vector Control District will conduct the following ground adulticide treatments: 7/13/2023: Williston...
Large airplane flying

Adulticide – USAFR – 7/18 – 7/20/2023

Posted on July 14, 2023

UPDATE: 7/20/2023 | Depending on weather and conditions, the USAFR is still planning to attempt an aerial adulticide treatment over Williston tonight, Thursday, July 20, but will also now be able include Watford City as originally planned. Treatments would begin near sunset. Residents may see a large military aircraft flying at low elevations while they...

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