Contra Costa County faces the triple threat of Hayward Fault earthquakes, wildfire risk in its eastern hills and Diablo Range, and industrial hazmat risk from the oil refineries and chemical plants along its shoreline. The 1989 Loma Prieta earthquake caused significant damage, and wildfire risk has grown substantially in recent drought years.
// Risk Intelligence
| Threat Score | 7 / 10 High Risk |
| Primary Hazard | Earthquake / Wildfire |
| Secondary Hazard | Industrial Hazmat |
| FEMA Flood Zone | Zone X (Seismic High Risk) |
| Federally Declared Disasters | 42 |
| Last Major Event | Diablo Fire (2021) |
| Event Frequency | Major event every 4–5 years |
// Emergency Operations
| Emergency Mgmt Phone | (925) 646-4461 |
| Emergency Shelters | 38 designated facilities |
| Evacuation Routes | I-680 South, I-80 West, SR-4 East, SR-24 West |
// Recommended Preparedness Gear
Based on Contra Costa County CA's primary hazard profile (Earthquake / Wildfire), the following gear is recommended for a High risk area.
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// County Profile
| County | Contra Costa County CA |
| State | California (CA) |
| Population | 1160099 |
| Area | 734 sq miles |
| FEMA Region | Zone X (Seismic High Risk) |
// Other California Counties
Santa Clara County CA
Earthquake / Wildfire
7/10
High
Placer County CA
Wildfire / Flooding
6/10
Moderate
Fresno County CA
Wildfire / Extreme Heat
6/10
Moderate
Riverside County CA
Wildfire / Earthquake
7/10
High
Ventura County CA
Wildfire / Earthquake
8/10
High
Stanislaus County CA
Flooding / Wildfire
6/10
Moderate