What is a Vector?

A vector is any arthropod, insect, rodent or other animal of public health significance capable of harboring or transmitting the causative agents of human disease (e.g. malaria, plague) to humans. Under certain circumstances, insects or other arthropods that cause human discomfort or injury, but not disease, are sometimes referred to as vectors.

The Greater Los Angeles County Vector Control District provides services to 35 cities and unincorporated areas of Los Angeles County to control vectors such as mosquitoes, midges and black flies. This is done by using an Integrated Vector Management (IVM) strategy that includes conducting surveillance, controlling sources and vectors, and public education. The result is a healthier community with a lower risk of disease outbreaks.

While the District conducts regular surveillance and control measures throughout the County there are a number of things homeowners can do around their homes to protect themselves from vectors.

For more information about other vectors and insects like rodents, bees, fire ants, ticks, and fleas, you may find more information here: https://www.glacvcd.org/resources/helpful-links/

Culex Mosquito

The Greater Los Angeles County Vector Control District’s primary objective is to protect its residents from the dangers of mosquito-borne diseases such as West Nile virus.



Midges are non-biting flies that resemble mosquitoes in size and general appearance. They are considered nuisances and are one of the vectors that are controlled by our specialized staff.


Black Flies
Black Fly on Leaf

Black flies are small, menacing, biting flies that are a nuisance to people and animals near running rivers and streams. Our specialized staff control populations of black flies along the Los Angeles River.


Our Services are at No Extra Cost

Are mosquitoes, black flies, or midges bothering you and you can’t seem to find the source? Submit a service request through our online portal.