News Flash


Posted on: July 23, 2021

Two Mosquito Pools Test Positive for WNV; City to Spray Overnight July 23 & 24

(July 23, 2021) This week two mosquito pools in Frisco tested ’positive’ for West Nile Virus (WNV). The locations are the same as last week. One is near Potomac Ln in the Stonelake Estates neighborhood. The other is near North County Rd south of Eldorado Pkwy.

In response, the city will ground spray overnight July 23 & 24 in public areas of Stonelake Estates and Custer Creek Farms, weather permitting. (see map PDF) Treatment for the North County Rd site will be more targeted and applied by an off-road UTV instead of a spray truck. The treatment area includes a part of the Meadow Hill Estates and Frisco Springs neighborhoods. (see map PDF)

In both locations, a third-party contractor will apply treatment for the two consecutive nights starting at 9 o’clock tonight through 5 a.m. Saturday. The overnight schedule is the same on Saturday, ending 5 a.m. Sunday, July 25.

“Following CDC guidance, we’re taking a more targeted approach to treat the area around the North County Rd test pool since this is the fourth consecutive week for a positive test there,” said Julie Fernandez, Environmental Health Supervisor. “The UTV off-road spray application is not as common of a treatment, but it will allow us to better target areas along the BNSF rail line that fog from the spray trucks may not reach from the road.”

Frisco residents are urged to ‘Wear, Apply and Remove’ as a precaution against mosquito bites.  The precautionary steps are promoted by the Texas Department of State Health Services (DSHS) and outlined below: 

  • WEAR: Wear long sleeves, pants outside at dawn and dusk when mosquitoes are most active.
  • APPLY: Use insect repellants every time you go outside. Approved repellents contain DEET, picaridin or oil of lemon eucalyptus.
  • REMOVE:  Drain standing water that collects in bird baths, French drains, clogged gutters, saucers under potted plants and ‘splash blocks’ (at end of gutter down spout). The mosquitoes that carry WNV can breed in stagnant water.

In accordance with its Mosquito Surveillance and Response Plan, Frisco began testing for mosquitoes May 1.  This makes 19 positive mosquito pools in Frisco this season. No human cases of WNV are confirmed in Frisco this year. 

For more information on the city’s plan, visit or contact the City of Frisco’s Health & Food Safety Division at 972-292-5304.

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