What is West Nile Virus?

West Nile Virus (WNV) is a potentially serious virus transmitted by mosquitoes that, when contracted by humans, affects the central nervous system. While the large majority of people exposed to West Nile Virus never contract the disease, those who do can suffer very serious symptoms that in extreme cases can result in hospitalization or even death. The elderly, the very young, and persons with underlying health conditions affecting their immune system can be more susceptible. WNV is a blood-borne disease and is not spread through casual contact. Public health officials declared 2012 the worst season on record for WNV in North Texas. More than 30 people in Lewisville came down with WNV in 2012. There are simple precautions people can take to protect themselves and their families from the disease.

City crews are regularly walking through and visually inspecting creeks and drainage channels to look for potential mosquito breeding sites. The city has multiple staff members who are authorized to apply anti-larval dunks or localized pesticide to curb the mosquito population.

Residents are encouraged to immediately take care of any standing water issues on their property to help fight mosquito breeding sites. Residents can report any mosquito complaints to Pedro Martinez at 972.219.3484 or email pmartinez@cityoflewisville.com or made online under "Requests/Health Concern."

2026 West Nile Virus Spraying Areas

Tuesday, July 28 and Wednesday, July 29

Vector Disease Control International, a private company contracted by the City of Lewisville, has confirmed the city's third and fourth positive West Nile Virus mosquito trap for 2026.

The positive samples came from a trap collected in the 900 block of Rachels Court and 800 block of College. These areas are part of of nine core sites in Lewisville regularly tested for the mosquito-borne virus.

Ground spraying will occur in a half-mile radius of the testing location. Weather permitting spraying is scheduled for Tuesday, July 28, and Wednesday, July 29, beginning at 9 p.m. both nights.

Trucks operated by Vector Disease Control International will conduct the spraying. The insecticide used is registered with the Environmental Protection Agency and poses minimal risk to humans and the environment.

Map description for 900 block of Rachels Court (first map): The highlighted project area is bounded by Palisades Drive to the north, Valley View Drive to the south, South Valley Parkway to the west, and the Interstate 35E/State Highway 121 frontage road to the east. The area extends along Bellaire Boulevard and includes neighborhoods east and west of South Edmonds Lane. It is bordered by Raldon Lake Park and Fox Creek Greenbelt Park to the northeast, Memorial Park to the southwest, and Central Park to the southeast. The project area includes the residential streets and neighborhoods within these boundaries.

800 block of College (second map): The highlighted area is bounded by Valley Ridge Boulevard on the north, West Main Street on the south, North Valley Parkway and Summit Ridge Drive on the west, and North Mill Street/Lynn Avenue on the east. The area includes neighborhoods along College Parkway and North Summit Avenue, extends across I-35E, and includes portions of Prairie Creek, Wayne Frady Park, and the surrounding residential streets.

Past ground spraying dates

Tuesday, July 14 and Wednesday, July 15

Vector Disease Control International, a private company contracted by the City of Lewisville, has confirmed the city's second positive West Nile Virus mosquito trap for 2026.

The positive sample came from a trap collected in the 900 block of Rachel’s Court. This area is one of nine core sites in Lewisville regularly tested for the mosquito-borne virus.

Ground spraying will occur in a half-mile radius of the testing location. Weather permitting spraying is scheduled for Tuesday, July 14, and Wednesday, July 15, beginning at 9 p.m. both nights.

Trucks operated by Vector Disease Control International will conduct the spraying. The insecticide used is registered with the Environmental Protection Agency and poses minimal risk to humans and the environment.

Map description: The Lewisville Valley 5 neighborhood project area is generally bounded by Palisades Drive on the north, Corporate Drive and Memorial Park on the south, South Valley Parkway on the west, and South Edmonds Lane on the east, with the project extending east of Edmonds Lane to include neighborhoods along Mockingbird Drive, Holly Oak Drive, Walnut Drive, Blue Oak Drive, and Red Oak Drive before ending near Central Park.

Within the project area, major east-west streets include Bellaire Boulevard, Palisades Drive, Madison Drive, and Oak Creek. Other streets shown within the neighborhood include Catalina Drive, Tiffany Lane, Valencia Lane, Granada Lane, Milestone Ridge, Kenny Court, Cliffrose Lane, Red Wing Drive, and several residential cul-de-sacs. 

Tuesday, May 19

Vector Disease Control International, a private company contracted by the City of Lewisville, has confirmed the city's first West Nile Virus mosquito traps for 2026.

The positive sample came from a trap collected in the 200 block of Highland Drive. This area is among the nine core sites in Lewisville regularly tested for the mosquito-borne virus.

Ground spraying will be conducted in a half-mile radius of the testing location. Weather permitting, spraying is scheduled for Tuesday, May 19, starting at 9 p.m. Trucks operated by Vector Disease Control International will conduct the spraying. The insecticide being used is registered with the Environmental Protection Agency and poses minimal risk to humans and the environment.