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Mosquito Control Program

Baltimore County needs your help in maintaining a successful mosquito control program.

Environmental Protection and Sustainability (EPS) and the Maryland Department of Agriculture (MDA) need your help in maintaining a successful mosquito control program.

What You Can Do

Eliminate potential breeding habitats for mosquitoes:

  • Clean your rain gutters to allow rain water to flow freely.
  • Remove old tires or drill drainage holes in tires used for playground equipment.
  • Check your yard for all types of containers that can hold water – store them inside or turn them upside down when not in use. Examples are flowerpots, wading pools, canoes and small boats, pet food and water dishes and wheelbarrows.
  • Check for trapped water in plastic or canvas tarps used to cover boat and pools. Arrange the tarp to drain the water. Pump out boat bilge.
  • Replace water in birdbaths and in the bottom of plant holders at least twice a week.
  • Flush livestock water troughs twice a week.
  • Fix dripping outside water faucets.
  • Check ornamental ponds, tree holes and water-holding low areas for mosquito larvae. Call the Mosquito Control Office if you find, or suspect, mosquito larvae are present.
  • If ditches do not flow and contain stagnant water for one week or longer, they can produce large numbers of mosquitoes. Report such conditions to the Mosquito Control Office. Do not attempt to clear these ditches because they may be protected by wetland regulations.

The Tiger Mosquito

While there are numerous types of mosquitoes that breed in the County, the tiger mosquito is very aggressive. Tiger mosquitoes are container-breeders and prefer residential areas where shade and water-holding containers are common. If they are present around your home, it is likely that they bred in your yard or the adjacent property.

The Tiger Mosquito is very aggressive.

The most effective method for controlling tiger mosquitoes is to eliminate or reduce the breeding containers that are located in or adjacent to your yard. The removal or draining of water holding containers will produce significant long-term reductions in mosquito annoyance.

The list of breeding sites is extensive and includes any water holding containers, but the primary sites in residential areas include: tires, buckets, cans, bottles, boats, flower pots, bird baths, outdoor statuary, ornamental pools, rain gutters, plastic or canvas tarpaulins, children's toys, rain barrels, and pet food and water dishes.

Other Types of Mosquitos

Find images of other types of mosquitos to be aware of in Maryland.

West Nile Virus

West Nile (WNV) is one of several viruses that cause encephalitis, or inflammation of the brain. The virus is transmitted by mosquitoes that acquire it from infected birds. The state of Maryland has set up a WNV Hotline. It is important to note that through December 2000, there has never been a documented case of WNV in humans in Maryland.

Call 1-866-866-CROW (2769) with questions pertaining to dead or dying birds, and to also request information on WNV.


Baltimore County Department of Environmental Protection and Sustainability and Environmental Health
Eastern phone: 410-887-4066
Western phone: 410-887-4065

Maryland Department of Agriculture – Mosquito Control Program
Phone: 1-877-425-6485

Maryland Department of Health and Mental Hygiene West Nile Virus Surveillance Hotline
Phone: 1-866-866-CROW (2769)

 Revised August 6, 2014


Revised April 6, 2016        

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