// Risk Intelligence
| Risk Score | 8 / 10 High |
| Facility Type | 💧 Water Treatment Facility |
| Operator / Branch | San Francisco Public Utilities Commission |
| Host County | San Francisco County CA |
| Nearest City | Washington DC |
| Primary Risk Radius | 25 miles |
| Secondary Risk Radius | 75 miles |
// Strategic Significance
The Hetch Hetchy water system supplies water to 2.7 million people in the San Francisco Bay Area from a reservoir in Yosemite National Park 167 miles away. The system crosses multiple earthquake fault lines including the Hayward and Calaveras Faults. The 1906 earthquake destroyed San Franciscos water system creating the conditions for the city to burn. The aqueduct crosses dozens of active fault lines.
// Civilian Impact Assessment
San Francisco Bay Area with 2.7 million customers. The 167-mile aqueduct crosses dozens of active fault lines. A major earthquake could rupture the aqueduct at multiple points leaving San Francisco without water during a fire emergency as happened in 1906.
// Evacuation & Shelter Guidance
Multiple facilities. San Francisco Emergency Management coordinates earthquake and water supply emergency protocols.