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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

Fogging Operation in Santa Clara & San José Completed

Ground fogging operations to suppress adult mosquitoes in of the cities of Santa Clara and San José were completed at 1:30 a.m. on Friday, August 28, 2015. A map of the treated area can be seen at

If virus is found in the post-treatment samples, additional fogging may be required. If no virus is found, further fogging will not be needed.

Check our Fogging Information page where you can find answers to the most frequently asked questions regarding WNV fogging.

Draft Environmental Evaluation-Public Comments Submitted
The comments that were received from the public during the public review period for our Environmental Evaluation and during the 2012 Public Scoping period are listed in this summary document (link to the pdf version).
The District will produce two types of responses. The first type will be designated as master responses. These will address those issues that were repeatedly raised among the comments from multiple individuals, but which all have the same response from the District. The second type will be designated as individual responses which need more specific response than is covered in the master responses.
The District has received 229 individual comments. Until June 19th, 2015 questions and comments can be clarified by email to Comments and question responses will be provided at the website on or before July 3rd, 2015. The draft document will then be reviewed in light of the comments and revised into a final version for website publication.