Epidemiology and Emergency Preparedness DIVISION

Integrated Vector Management 

355 Texas Avenue
Round Rock, TX 78664

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Mosquito Risks

Fight the bite read website banner, "protect yourself. your family. and community from mosquitoes"
The Integrated Vector Management (IVM) Program at Williamson County and Cities Health District (WCCHD) protects the health of county residents from vector-borne diseases through surveillance, control, prevention, and community outreach.

2023 Season Data

West Nile Virus-Positive
Collection Date
City   Approximate Location Adult Mosquito Control
9/14/23 Unincorporated Wilco Cat Hollow Park - Brushy Creek MUD None
9/12/23 Granger Colorado Street None
9/8/23 Georgetown Blue Hole Park None
9/8/23 Taylor Murphy Park None
9/6/23 Cedar Park Veterans Park None
8/31/23 Unincorporated Wilco Cat Hollow Park - Brushy Creek MUD None
8/29/23 Georgetown Sun City 9/3 & 9/4
8/29/23 Bartlett Mt. Aratat Community Park 9/3 & 9/4
8/29/23 Taylor Murphy Park 9/3 & 9/4
8/17/23 Unincorporated Wilco Beck Preserve - Brushy Creek MUD None
8/17/23 Unincorporated Wilco Cat Hollow Park - Brushy Creek MUD None
8/10/23 Unincorporated Wilco Beck Preserve - Brushy Creek MUD None
8/8/23 Georgetown Sun City 8/14 & 8/15
8/3/23 Unincorporated Wilco  Cat Hollow Park - Brushy Creek MUD  None
7/27/23 Unincorporated Wilco  Cat Hollow Park - Brushy Creek MUD  None
7/27/23 Cedar Park Milburn Park None
7/25/23  Granger  Colorado Street 8/6 & 8/7
7/20/23  Unincorporated Wilco  Cat Hollow Park - Brushy Creek MUD None
7/18/23  Unincorporated Wilco  Sonterra MUD Community Pool 7/23 & 7/24
7/13/23  Unincorporated Wilco  Cat Hollow Park - Brushy Creek MUD None
7/7/23  Unincorporated Wilco  Beck Preserve - Brushy Creek MUD None
6/27/23  Georgetown  Blue Hole Park None
6/21/23  Unincorporated Wilco  Sonterra MUD Community Pool 6/25 & 6/26
6/13/23  Unincorporated Wilco  Sonterra MUD Community Pool None
5/23/23  Georgetown  Geneva Park None

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WCCHD Integrated Vector Management (IVM) protects Williamson County by:

  • Monitoring mosquito populations through vector surveillance methods.
  • Detect arthropod-borne (Arbo) viruses through samples collected and tested at the DSHS laboratory.
  • Educate citizens, community groups, and the media regarding mosquito control and prevention.
  • Utilize surveillance data from samples and evidence-based best practices to recommend the most appropriate mosquito control measures to cities.
  • Track and monitor mosquito-borne disease activity throughout Williamson County using Geographical Information System (GIS) software.
  • Coordinate the Mosquito Working Group with other member cities in Williamson County. 
  • Investigate arboviral infections in humans that are reported to WCCHD.
  • Generating a weekly arbovirus summary report for Williamson County during WNV season. 
Williamson County residents benefit from IVM resources and services by:
  • Providing an early warning system to detect arboviruses in the mosquito population before humans and animals are infected.
  • Informing local public health officials and medical providers of the possible risk for human infections.
  • Providing information to the public about the arboviral activity so they can take the proper precautions.
  • Allowing member cities to target specific areas for mitigation quickly and appropriately.
  • Using environmentally conscientious approaches to control larval and adult mosquitoes.
  • Using a combination of control measures that best meet the needs of specific cities.
DKY: IT TAKES ONLY ONE TEASPON TO GROW MOSQUITOES. A mosquito layered on top of a measuring spoon.

WCCHD IVM team is working towards expanding services and resources to better protect Williamson County. The expansion will further explore GIS mapping to identify and mitigate mosquito breeding sites, expanding mosquito surveillance and to include larval mosquitoes, developing a tick surveillance program, and increase in-house capacity to identify potential vector species. 

WHY THIS PROGRAM WAS STARTED: The mosquito surveillance program at WCCHD began in 2013 following a large outbreak of West Nile virus (WNV) in Texas in 2012. This allows public health to monitor the virus in both human and mosquito populations and use evidence-based practices to make control recommendations to areas with viral activity.

USEful linksUsing the Right Repellent
Homeowner Checklist
Skeeter Beater Coloring Book
CDC - A to Z Index of Vector-Borne Diseases
CDC - Division of Vector-Borne Diseases
DSHS - Arbovirus Weekly Activity Reports
DSHS - Texas West Nile Virus FAQ

Vector FAQ

Mosquito Prevention Tips

How to Choose the Right Insect Repellent

Can dogs, cats and other pets get the West Nile virus?

How do humans get West Nile virus?

What are the symptoms of West Nile virus infection?

How long does it take to get sick if bitten by an infected mosquito?

Is there a treatment or a vaccine for West Nile virus infection?

Can a human get West Nile virus twice?

What is the risk of someone becoming infected with West Nile?

Besides mosquitoes, can you get West Nile Virus from other insects or ticks?

Do we have West Nile Virus in Williamson County?

Where did West Nile come from?

I've heard of " suspect cases," " positive cases," " confirmed cases," and " probable cases." What does it all mean?

How does West Nile virus affect backyard chickens?