UPDATE MARCH 30, 2020:  The following City of Williamsburg buildings and facilities are closed to the public through April 23:  Municipal Building, Stryker Center, Quarterpath Recreation Center, Waller Mill Park, Police Department and Fire Station (only required staff will be at work, others will be teleworking). Governor Northam issued a "stay at home" executive order through June 10, 2020. Business assistance information can be found here. The City's telephone hotline (for city service questions):  (757) 259-7200 and the Virginia Health Dept. call center (for COVID-19 questions/concerns):  (757) 594-7069.

Mosquito Control Program

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Public Works & Utilities Department
401 Lafayette Street, Williamsburg, VA 23185
Phone: 757-220-6140
Office hours of operation: Monday - Friday 8:00 a.m. until 4:30 p.m.  
After Hours Emergency Number 757-220-2331 

 Mosquito truck   

The City of Williamsburg Mosquito Control Program and You

The City of Williamsburg Mosquito Control Program is aimed at protecting public health by reducing the number of mosquitoes during mosquito season June through September.  Program includes: fogging/spraying areas of the City from public streets on Wednesdays beginning the route around dusk.  Spraying is impossible during rainy conditions.  The program includes on-site yard inspections, eliminating breeding sites such as standing water and using a low-toxicity pesticide to reduce larvae when removing standing water is not feasible. 

Did you know?

  • The entire life cycle from egg to adult can be completed in less that 10 days.  Most species live about 2 weeks.
  • Only female mosquitoes bite.  They require a "blood meal" in order to develop eggs to breed more mosquitoes.
  • They can fly up to 10 mph, dart between raindrops, and even fly backwards.
  • One discarded tire full of water can potentially produce tens of thousands of mosquitoes over a season. 


Mosquito Breeding

What are the top ten ways YOU can reduce the number of mosquito breeding habitats around your home? 

1.  Change the water in birdbaths at least once a week. 
2.  Clean leaf-filled drains to allow proper drainage.
3.  Fill in or drain any low places (puddles, ruts) in yard.
4.  Clean leaf-filled gutters to allow proper drainage. 
5.  Keep grass cut short and shrubbery well-trimmed around the house so adult mosquitoes will not have a place to hide.
6.  Change water in ornamental ponds and fountains at least once a week.
7.  Clean roof areas to allow proper drainage.
8.  Make sure your backyard pool is properly cared for while on vacation.
9.  Turn buckets, baby pools, boats and other outside containers upside down when they are not in use. 
10. Screen or cover rain barrels, garbage cans and other large containers.  And properly dispose of old tires. 
11. Repair leaky water faucets, water hoses and air conditioners. 


What does the City use to control Mosquitoes? 

We use a sustained release mosquito growth regulator larvacide called Altosid (pellets & briquettes) to prevent adult mosquito emergence.  Altosid is used in storm drains, catch basins, roadside ditches, and standing water that have potential to breed mosquitoes.  For our spraying during the months of June-September we use Duet, an advanced dual-action mosquito adultcide that combines the proven efficacy of Sumithrin and Prallethrin. Together, these two active ingredients provide a unique, effective and faster way to control mosquitoes yet biodegrade rapidly.  Both are synthetically produced to emulate naturally occurring pyrethrins found in the chrysanthemum flower. 


Would you like an on-site Yard Inspection? 

A City employee will come out to inspect your yard for high mosquito activity.  Please call our office to set up an appointment at 757-220-6140 or 


Have a mosquito concern or question? 

Please call our office to set up an appointment at 757-220-6140 or 


Mosquitos CDC

Keep Informed

The Centers for Disease Control (CDC) and the Virginia Department of Health are monitoring Zika cases. Zika is a disease that is spread mostly by the bite of an infected mosquito. Learn how you can protect yourself from Zika and how to recognize Zika symptoms by visiting


Mosquito-related links

Virginia Department of Health 

Virginia Mosquito Control Association