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Mosquito Spraying

Last updated: June 18, 2020

The Mosquito Community Spray Program is coordinated by the Maryland Department of Agriculture. The Anne Arundel County Department of Health has been informed that the program has been suspended for the 2020 mosquito breeding season. Please call MDA at 410-841-5870 to initiate your request for calendar year 2021 or for more information.


Mosquito Spraying: Public Health Protection

Mosquito image

Mosquito-spraying services are undertaken by the Maryland Department of Agriculture where a positive test for a mosquito-borne disease is identified through surveillance activities. Residents are notified of the positive test result, the potential for the transmission of a mosquito-borne disease, and the immediate need for mosquito spraying services in a geographic area. For information on any unscheduled mosquito spraying, click here.

In addition to the surveillance work, local health officials monitor the occurrence of mosquito-borne cases in humans for West Nile virus (WNV), eastern equine encephalitis (EEE) virus, and St. Louis encephalitis (SLE). The cases are mapped using a geographic information system (GIS) and mosquito-spraying services are enhanced in the identified areas.

Exclusion requests: Properties requesting an exemption or exclusion from the mosquito-spraying program will not be recognized where mosquito-spraying is necessary to protect public health or where services are enhanced based on documented human cases of mosquito-borne diseases.

Mosquito Spraying: Nuisance Abatement

Mosquito-spraying services to abate or control adult mosquitoes as a nuisance are initiated only when surveillance data exceeds the action threshold. The action threshold to initiate mosquito-spraying services for nuisance abatement includes the following and applies only to participating communities:

Action threshold to initiate ground mosquito spraying activities:

  • A minimum of 12 adult mosquitoes using the light trap collection method is required; or
  • A minimum of 3 adult mosquitoes in a 2-minute period using the landing rate method* is required.

Action threshold to initiate aerial mosquito spraying activities is:

  • A minimum of 100 female adult mosquitoes using the light trap collection method is required; or
  • A minimum of 12 mosquitoes per minute using the landing rate method* is required.

*A count of the number of mosquitoes landing on an inspector’s body below the waist is used to determine the adult mosquito population.

MDA Mosquito Control Policy

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