Natural Disaster Risk in Millbrae

Natural Hazard Profile: Millbrae, California

Millbrae, in San Mateo County, is a city of approximately 22,689 residents situated in the western mountain region near the Pacific Coast. Its Mediterranean climate brings dry summers and mild, wet winters with pronounced drought cycles, and in particular a critical fire season from late summer through fall. These conditions collectively define the natural hazard environment that Millbrae residents and property owners must navigate.

According to FEMA's National Risk Index, Millbrae carries an overall risk score of 5.9/10, placing it in the moderate category. Seismic activity is the dominant hazard, with the community situated in or near an active tectonic zone capable of producing damaging ground shaking. The area also faces notable exposure to landslide and coastal flood.

Within California, Millbrae's risk is, near the 5.9/10 state average. Nationally, it ranks above the U.S. national average of 4.5/10. FEMA's analysis of San Mateo County identifies earthquake as the foremost hazard, followed by landslide and coastal flood. These rankings reflect the relative frequency and severity of each hazard type in the local environment.

With a moderate risk rating, Millbrae residents are well-served by maintaining standard preparedness practices — an emergency supply kit, awareness of local hazard seasonality, and insurance that covers the top local risks. Periodic review of coverage for earthquake is recommended.