Skip to main content


What is a vector?

A “vector” is defined in the California Health and Safety code Section 2002​ as “any animal capable of transmitting the causative agent of human disease or capable of producing human discomfort or injury.”

Quite simply, if the animal is a carrier of viruses/bacteria/parasite that can transmit directly to humans, then it is considered a vector.

Am I in your District?

The District covers 26 cities including Alhambra, Azusa, Baldwin Park, Bradbury, Claremont, Covina, Duarte, El Monte, Glendora, Industry, Irwindale, La Puente, La Verne, Monterey Park, Monrovia, Pasadena, Pomona, Rosemead, San Dimas, San Gabriel, Sierra Madre, South Pasadena, Temple City, West Covina, Walnut, and also includes some unincorporated portions of L.A. County.

What services do you provide?

Our District provides surveillance, inspection, treatment and education for mosquitoes and black flies. The most commonly requested services include: Property inspections for mosquito breeding sources, investigation and/or treatment of neglected pools, delivery of mosquito fish, investigation/surveillance of day biting mosquitoes, and investigation into excessive activity of biting insects.

How do I request service?

You request service by calling (626) 814-9466 or submitting a Service Request online.

What is the cost of service?

Our District is a government health agency funded through an annual property tax assessment. There are no additional costs associated with individual service or pesticide treatments.

Will you come out to remove bees?

No. Our District does not provide a service to remove bees or wasps. Please consult a local pest control company. You can find one at or you may also visit our Other Vectors of Concern page for general information.

Do you treat for termites, rodents, cockroaches or other pests?

No. Our District does not treat for these types of pests. The state of California does not license vector control agencies for this type of pest control. Please consult a local pest control company. You can find one at

How can I keep mosquitoes away from my home?

The best way to keep mosquitoes away from your home is to remove sources of standing water. Mosquitoes need standing water to lay their eggs and develop. Examples of mosquito breeding sites are birdbaths, ornamental fountains and ponds, neglected swimming pools, used tires, watering cans, buckets, rain gutter, and any other container that will hold water. Even something as small as a bottle cap filled with water can grow mosquitoes. Mosquitoes can also come from your neighbors’ yards, so be sure to share this information with them as well.

How can I prevent mosquito bites?

There are a few things that you can do to prevent mosquito bites.

  • Dump and drain standing water near your home.
  • Wear repellant when outdoors, especially between dusk and dawn.
  • Wear long sleeves and pants when outdoors between dusk and dawn.
  • Keep tight fitting screens on all windows and doors.

Where can I get information about a pesticide treatment scheduled in my area?

Large scale pesticide treatments are conducted based on real time data which indicates a necessary response to an immediate threat. Therefore, the District must move very quickly to address the threat once it has been identified. With that said the District also appreciates the importance of public awareness and makes every effort to give the community sufficient notice. Details regarding all large scale treatments will be posted 36–72 hours prior.  An e-mail notification will be made to the press, local officials and those signed up for our public health e-mail alerts.  The information will also be posted on our website and our Facebook and Twitter accounts. Physical notices will be posted around the neighborhood within the treatment area.

The best way to get the most up to date information about pesticide treatments and all other District news is to like us on Facebook and follow us on Twitter. Click here for more information about pesticide treatments.

Are invasive Aedes mosquitoes in my neighborhood?

Invasive Aedes mosquitoes have now been identified in all of the cities within the District's boundaries.