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8/19/25 The Williams County Vector Control District (WCVCD) is planning to conduct ground spray adulticide treatments across several cities this week between Tuesday, August 19 and Sunday, August 24, 2025. WCVCD will be conducting these applications across Grenora, Ray, Williston and Trenton using Zenivex and DeltaGard products. Weather permitting, all treatments will occur after sunset....

8/15/25 The Williams County Vector Control District (WCVCD) plans to conduct ground ULV mosquito control treatments in both Ray and Grenora after sunset on Friday evening (8/15/2025), weather permitting. For these missions, WCVCD will use Deltagard which has an active ingredient Deltamethrin. This product is approved for residential mosquito control by the Environmental Protection Agency...

8/12/25 The Williams County Vector Control District (WCVCD) will be conducting both ground and aerial adulticide treatments between August 12 and August 13, 2025. The WCVCD is planning ground adulticide applications across Grenora, Ray, Williston's Block 8 and in South Williams County (west of Lake Jessie). In Ray and Grenora, WCVCD will be using Zenivex,...

In collaboration with the Williams County Vector Control District (WCVCD), the United States Air Force Reserve (USAFR) will be conducting an aerial spray mission over Williston between August 5, 2025 and August 8, 2025, if weather and conditions allow.The large military aircraft will be flying at low elevations during the mission. Treatments will take place...

8/5/25: The Williams County Vector Control District (WCVCD) will be conducting ground adulticide treatments in Ray, Grenora, and Trenton after sunset Tuesday, August 5, 2025, weather and conditions permitting. If conditions do not allow, the treatments will be rescheduled for Wednesday, August 6. Ground adulticide applications will take place in Ray and Grenora using Zenivex,...