News Flash


Posted on: July 16, 2021

Two Mosquito Pools Test Positive for WNV; City to Spray Overnight, July 16-18, Increase Surveillance

(July 16, 2021) Two mosquito pools in Frisco tested ’positive’ for West Nile Virus (WNV) this week. One location is near North County Rd south of Eldorado Pkwy. The other is near Potomac Ln in the Stonelake Estates neighborhood, southeast of the intersection of Eldorado at Independence Pkwy.  

In response, the city will ground spray July 16 – 18 in areas of the Meadow Hill Estates and Frisco Springs neighborhoods (see map PDF), weather permitting. A third-party contractor will apply treatment for three consecutive nights starting at 9 o’clock tonight through 5 a.m. Saturday morning. The overnight schedule is the same on Saturday and Sunday, ending 5 a.m. Monday morning.

The city is also increasing surveillance efforts in public areas of Stonelake Estates and Custer Creek Farms in response to the positive test pool on Potomac Ln. (see map PDF)  Areas where mosquito breeding is observed will be treated with larvicide.

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 17 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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