News Flash


Posted on: October 1, 2021

Two Mosquito Pools Test Positive for WNV; City to Spray Overnight October 1 & 2

(October 1, 2021) This week two mosquito pools in Frisco tested ’positive’ for West Nile Virus (WNV). The first location is in the 12,000 block of Rolater Rd, west of Coit Rd. The second location is near Potomac Ln. in the Stonelake Estates neighborhood. 

In response, the city will ground spray overnight, October 1 & 2, in some areas of these neighborhoods: Fairfield Estates, Shepherds Hill, Plantation Estates, Parkside Estates and the Lakes of Preston Vineyards (see map PDF). The other spray area is in parts of Stonelake Estates and Custer Creek Farms (see map PDF).

Weather permitting, a third-party contractor will apply treatment for two consecutive nights starting at 9 o’clock tonight, October 1, through 5 a.m. Saturday, October 2. The schedule is the same overnight Saturday through 5 a.m. Sunday, October 3.

This makes 33 positive mosquito pools in Frisco this season. Check out our GIS Mosquito Dashboard to see the locations. No human cases of WNV are confirmed in Frisco this year.

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.  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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