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.
// Recommended Supplies
Essential gear for power outages, severe weather, and emergency situations in your area.
- Emergency Food Supplies
- Water Filtration & Storage
- Backup Generator
- Solar Backup Power
* We may earn a commission from qualifying purchases.
// 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 |
// County Profile
| County | Contra Costa County CA |
| State | California (CA) |
| Population | 1,160,099 |
| Area | 734 sq miles |
| FEMA Region | Zone X (Seismic High Risk) |
// Major Cities
// Cities in This County
// Other California Counties
// Nearby Infrastructure Risks
Critical infrastructure facilities within or near this area that could affect civilian safety during emergencies, conflict, or infrastructure failures.
Infrastructure risk data is for emergency preparedness awareness. Facility locations are publicly known. Always follow official emergency guidance.