Important COVID-19 Update: Delays in response times, changes to services, and The DISTRICT BUILDING IS CLOSED TO THE PUBLIC. Click for more information.


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Current Virus Activity

Learn more about the current West Nile virus activity in Contra Costa County.

News and Current Events

Announcements and articles highlighting important vector and vector-borne related news.

Frequently Asked Questions

Get all the answers to our most frequently asked questions.

Invasive Mosquito Species of California

While not currently in Contra Costa County, two invasive species that can transmit Zika, dengue, yellow fever, and chikungunya are in other parts of the state.

In a Minute Videos

These videos take you right to the action as we control the insects and animals capable of transmitting disease/causing harm.