The City of Granger has coordinated truck-mounted spraying to occur on the evenings of Sun. Aug. 6 and Mon. Aug. 7, (weather permitting) in the area below based on a positive West Nile virus mosquito sample was collected from a trap site near Colorado Street in Granger, TX on 7/25/23. Although the mosquito control product poses no significant health risk, if possible, people and pets may want to stay indoors during spraying.
Since testing began in May, 11 mosquito samples have tested positive for West Nile virus. No human cases have been reported in Williamson County to date, however, there have been five human cases reported in Texas this year.

Mosquitoes breed in standing water, needing as little as one teaspoon. By draining all sources of standing water in and around your property, you reduce the number of places mosquitoes can lay their eggs and breed.

What you can do:
  • WCCHD encourages residents in affected areas to be a part of the solution by eliminating insect breeding areas and larvae before they develop into adult, flying mosquitoes. Standing water can be treated with EPA-approved larvicides that are available for retail purchase.
  • Larvicides are products used to kill immature mosquitoes before they become adults. Larvicides are applied directly to water sources that hold mosquito eggs, larvae, or pupae. When used consistently, larvicides can help reduce the overall mosquito burden by limiting the number of mosquitoes that are produced, according to the Centers for Disease Control and Prevention (CDC).
  • Drainstanding water in flowerpots, pet dishes, or clogged gutters so mosquitoes don’t have a place to breed and treat water that can’t be drained,
  • Defendby using an EPA-registered insect repellent, and
  • Dressin long sleeves and pants when outdoors.
For more information, go to the WCCHD website at or visit the Texas Department of State Health Services West Nile website at