Pierce County sits directly in the lahar flow path from Mount Rainier — the most dangerous volcano in the United States. A major eruption or debris avalanche could send volcanic mudflows down the Puyallup and Carbon River valleys into densely populated Tacoma suburbs within hours with little warning time. The county also faces Cascadia Subduction Zone megathrust earthquake risk.
// 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
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// Risk Intelligence
| Threat Score | 8 / 10 High Risk |
| Primary Hazard | Earthquake / Volcanic Lahar |
| Secondary Hazard | Flooding |
| FEMA Flood Zone | Zone X (Seismic High Risk) |
| Federally Declared Disasters | 45 |
| Last Major Event | Nisqually Earthquake (2001) |
| Event Frequency | Major event every 4–5 years |
// Emergency Operations
| Emergency Mgmt Phone | (253) 798-6595 |
| Emergency Shelters | 38 designated facilities |
| Evacuation Routes | I-5 North, I-5 South, SR-512 East, SR-7 South |
// County Profile
| County | Pierce County WA |
| State | Washington (WA) |
| Population | 921,173 |
| Area | 1676 sq miles |
| FEMA Region | Zone X (Seismic High Risk) |
// Major Cities
// Cities in This County
// Other Washington 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.