County: San Mateo, CA | Disaster Type: Disasters, Extreme Cold & Winter Storm, and Severe Storm | Incident: California Winter Storm (01/2023) | Resource Type: General Incident Information and Preparedness Information

San Mateo County, California Winter Storm – General Information and Emergency Alerts,

The County of San Mateo and surrounding region is experiencing a series of winter atmospheric river storm events. Please click here for information on how to get involved and be prepared in your community during a serious disaster.

County of San Mateo

400 County Center
Redwood City, CA 94063

Monday-Friday 8AM-5PM

Main Phone Number


Beach Hotline


During emergencies, public safety personnel are busy responding to urgent life and safety issues. Please refrain from calling 911 unless necessary.