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Mosquito Inspections and Surveillance

Site inspections of residential and commercial properties are conducted in response to requests made by calling 311 or made electronically via the 311Direct website or the 311Direct mobile application.

Some mosquito species deposit their eggs into water-holding containers found around the home and the resulting adult mosquitoes bite. Our inspectors carefully check the yard of the individual who requested the inspection, as well as several adjacent properties, in search of any type of container that is holding water and therefore breeding mosquitoes.

When mosquito breeding is found, the containers are emptied, removing the source of the problem. Insecticide may be used to treat large containers, such as swimming pools that are found to be breeding mosquitoes. Alternatively, our inspectors may release mosquito larvae-eating Gambusia fish into abandoned swimming pools or outdoor spas and hot tubs. Yards are sprayed using portable spray equipment to kill any adult mosquitoes found in the area.

Our team of inspectors are equipped with technology that enables them to report their findings in real time. The system directly interfaces with the 311 communications system, enabling a prompt email response to the person who requested the inspection.

The often-requested spray truck does little to control domestic mosquitoes and is not used unless migration of adult mosquitoes from the Everglades National Park or Biscayne National Park causes excessive numbers of mosquitoes in the populated areas.

Miami-Dade County Mosquito Control inspectors and contractors can be identified by the following:

  • Mosquito Surveillance

    Mosquito Control experts use a variety of surveillance activities to identify the  type and the amount  of mosquitoes that exist in an area. Some of the methods used:
    • Finding and monitoring places where adult mosquitoes lay eggs and where the larvae will hatch
    • Tracking mosquito populations and the viruses they may be carrying
    • Determining if EPA-registered insecticides will be effective

    If mosquito counts recorded at a trap in the array exceeds a certain level, Mosquito Control inspectors are dispatched to the area to perform inspections and mosquito reduction activities if warranted.

    The surveillance array is another tool being utilized by Miami-Dade County as part of a complete mosquito control program that aims to reduce the mosquito population to protect residents and visitors from mosquito-borne illnesses.

    Traps located at the locations illustrated in the map below are monitored on a weekly basis to assess mosquito counts.

    surveillance map

  • Storm Drain Treatment Program

    Miami-Dade County’s storm drain system is designed to clear the streets and swales of water after heavy rainfalls. When the drains are clean and free of trash and debris, they work quickly and efficiently to prevent standing water on the streets for long periods of time.

    In 2006, due to an increasing number of mosquito breeding complaints related to storm drains, the County began treating storm drains with the larvicides Bacillus thuringiensis israelensis, Bacillus sphaericus and Methoprene. We continue to treat and control larvae regularly in storm drains using these larvicides.

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