Current West Nile Virus Information for San Mateo County

2025

Data will be added here as results are available.

To see data from previous years, visit our page about historical West Nile virus findings.

Page last reviewed: May 28, 2025

Report Dead Birds

You can report a dead bird through the state's website. Dead bird reports are often the first sign that West Nile virus is active in an area, and the reports help track West Nile virus throughout the year.

Computer-generated image of an orange spray pump bottle with an icon of the mosquito on the front with a red circle and line through the mosquito. The bottom of the bottle has text reading "EPA Reg. No. 1234-567" with an arrow pointing to the text.

Safe, effective insect repellents

EPA-registered insect repellents are safe, effective, and one of the best ways to protect you and your family from diseases mosquitoes can spread.

Report biting mosquitoes

Are mosquitoes biting you in or around your home? Submit a report HERE or call 650-344-8592 to report biting mosquitoes.

2025

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