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Vector Control District
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Vector Control’s Mission is to detect and minimize vector-borne diseases, to abate mosquitoes, and to assist the public in resolving problems with rodents, wildlife, and insects of medical significance.

What’s a vector?

A vector can be a mosquito, a rat, a flea, a tick, any animal or insect that can transmit disease or cause harm to humans.

What exactly is Vector Control?

The Santa Clara County Vector Control District is a County public health program that controls and monitors disease-carrying insects such as mosquitoes and ticks, and other harmful pests such as yellow jackets and rats. Primary services include:

  • Detection of the presence/prevalence of vector borne disease through planned tests, surveys, and sampling

  • Inspection and treatment of known mosquito and rodent sources

  • Response to customer initiated service requests for identification, advisory, and/or control measures for mosquitoes, rodents, wildlife, and miscellaneous invertebrates (ticks, yellow jackets, cockroaches, fleas, etc.)

  • Promotion of public awareness through outreach and educational services


Our programs and services are provided free of charge to all residents of the Santa Clara County.

  • Mosquito Inspection and Control

  • Free delivery of mosquito fish

  • Inspection & Advice for Rats and Mice

  • Insect Identification

  • Wildlife Advice and Inspection

  • Community Education


We would like to thank everyone who was part of our successful open house event held on Tuesday April 21st, 2015.

The winner of our “Guess How Many Mosquitoes” contest was: Joanne Tracey.

She answered 2701 when there were 2731 mosquitoes in the jar. Amazing guess! 

03.27.2015 - Santa Clara County VCD has detected the first West Nile virus positive birds of 2015. The three American crows were found on March 19th in San Jose (zip 95124), March 20th in San Jose (zip 95123), and on March 20th in Cupertino (zip 95014).

Map of Dead Bird Positives

This detection signals the start of the West Nile season. Residents are urged to use preventive actions to avoid mosquito bites and West Nile virus.

These include:

  • Draining or dumping standing water

  • Using mosquito repellent, according to the label

  • Repairing holes or tears in screens/doors

  • Report mosquito problems using our request for service

Dead birds can be reported online at

More information on West Nile virus and mosquito control can be found on our Mosquitoes page.