No longer Available: In-Person Mosquitofish Pick Up. Contra Costa county residents can request mosquitofish by clicking here.

 

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Frequently Asked Questions

Get all the answers to our most frequently asked questions.

Invasive Mosquito Species of California

One of the two species that can transmit Zika, dengue, yellow fever, and chikungunya, was found in Contra Costa County in August, 2022.

95 Years of Protecting Public Health

The District is celebrating a milestone as a public health agency.