May 19, 2022: Requesting service via telephone is currently unavailable.
to request service via our website.
No longer Available: In-Person Mosquitofish Pick Up. Contra Costa county residents can request mosquitofish by
Board Agendas and Minutes
View Current Board Meeting Agenda
to receive Board of Trustees Meeting Agendas
Current Virus Activity
Learn more about the current West Nile virus activity in Contra Costa County.
Mosquito Control Info
2022 Virus Activity To Date
News and Current Events
for Online Newsletter, Adult Mosquito Control Notifications, and News Releases.
First Bird of 2022 Tests Positive for WNV
| 95 Years of Protecting Public Health
| Mosquitofish Service Changes
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 highlight our efforts regarding inspection and control efforts of the insects and animals our District provides services for.