Metropolitan Water District of Southern California CA — Infrastructure Risk Profile

// Risk Intelligence

Risk Score	8 / 10 High
Facility Type	💧 Water Treatment Facility
Operator / Branch	Metropolitan Water District
Host County	Los Angeles County CA
Nearest City	Washington DC
Primary Risk Radius	100 miles

// Strategic Significance

The Metropolitan Water District of Southern California is the largest water wholesaler in the United States serving 19 million people across a 5200-square-mile service area from Ventura to San Diego. The MWD imports water from the Colorado River via the Colorado River Aqueduct and from Northern California via the State Water Project. Its water treatment and distribution infrastructure includes massive facilities at Jensen Diemer and other plants that are critical to Southern California's survival in an arid region.

// Civilian Impact Assessment

Southern California has virtually no local water supply — Los Angeles San Diego and surrounding cities depend almost entirely on imported water controlled by the MWD. A major earthquake disrupting aqueduct infrastructure could leave 19 million people without water within days. A cyberattack on water treatment systems — like the 2021 Oldsmar Florida attack — could contaminate drinking water for millions. Prolonged drought already stresses the system.

// Evacuation & Shelter Guidance

Southern California residents should store minimum 2 weeks of water given the region's total dependence on imported infrastructure. A major earthquake disrupting the aqueduct system would be a survival emergency. Keep at minimum 1 gallon per person per day stored. Water filtration capability is essential. Monitor LA County and regional water authority emergency broadcasts during any water quality event.