News Flash


Posted on: August 20, 2021

One Mosquito Pool Tests Positive for WNV; City to Treat With Two Methods Overnight August 27 -29

(August 27, 2021) This week one mosquito pool in Frisco tested ’positive’ for West Nile Virus (WNV). The location is near North County Rd., south of Eldorado Pkwy. This is the sixth positive test at this location so far this year. In response, the city will use two different treatment methods this weekend, weather permitting.

The first method of treatment is ground spraying overnight, August 27 & 28, in some areas of the Meadow Hill Estates and Frisco Springs neighborhoods. (see map)  Then overnight, August 29, treatment continues, but will be applied by an off-road UTV instead of a spray truck. The treatment area is more targeted to areas along the BNSF rail line where fog from the spray trucks may not reach from the road. (see map)

A third-party contractor will apply treatment for the three consecutive nights starting at 9 o’clock tonight through 5 a.m. Saturday, August 28. The overnight schedule is the same on Saturday, ending 5 a.m. Sunday, August 29, and again Sunday night, ending 5 a.m. Monday, August 30. 

This makes 26 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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