DisasterAWARE
9
Extreme

flood Flood Risk in California

Overall State Risk Score: 9/10

California faces extreme flood risk. 8 of 20 counties (40%) rated high or very high by FEMA National Risk Index.

Seasonal pattern: March-September

Highest-Risk Cities in California

1
Los Angeles, CA
Extreme · 82 historical events
FEMA: 9Historical: 10
2
San Diego, CA
Extreme · 63 historical events
FEMA: 9Historical: 10
3
San Jose, CA
Extreme · 75 historical events
FEMA: 9Historical: 10
4
Long Beach, CA
Extreme · 76 historical events
FEMA: 9Historical: 10
5
Oakland, CA
Extreme · 97 historical events
FEMA: 9Historical: 10

Notable Flood Events

Flash Flood - San Diego, California, United States

December 31, 2025 — WARNING

San Diego, CA

2,140,000 people exposed; $582,824M capital exposed

Flash Flood - Central California, United States

December 23, 2025 — WARNING

Fresno, CA

658,000 people exposed; $163,975M capital exposed

Other Hazards in California

earthquake
Earthquake Risk
Score: 9/10
wildfire
Wildfire Risk
Score: 9/10
hurricane
Hurricane Risk
Score: 1/10
tornado
Tornado Risk
Score: 5/10
winter-storm
Winter Storm Risk
Score: 7/10
landslide
Landslide Risk
Score: 7/10
extreme-heat
Extreme Heat Risk
Score: 7/10
drought
Drought Risk
Score: 9/10
high-wind
High Wind Risk
Score: 5/10
tsunami
Tsunami Risk
Score: 9/10

How this data is built

California flood risk combines Historical Event Intelligence with authoritative hazard modeling from the Geospatial Intelligence Layers catalog. Live event monitoring is available through the Event Intelligence API and the DisasterAWARE Platform.

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