Los Angeles County Disaster Risk
Los Angeles County, California
FEMA Risk Rating
Very High
National Percentile
100th
of 3,144 counties
State Rank
#1
of 58 (1 = highest risk)
Flood Risk
100th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Very High
Higher than 100% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Very High
Higher than 100% of US counties
Tornado
Tornado and severe thunderstorm risk
Relatively High
Higher than 98% of US counties
Earthquake
Seismic activity and ground shaking risk
Very High
Higher than 100% of US counties
Hurricane
Tropical cyclone and hurricane risk
Very Low
Higher than 0% of US counties
Risk Overview
About Natural Disaster Risk in Los Angeles County, California
LA County faces the highest risks
Los Angeles County scores a perfect 100.0 on the composite risk scale, rating "Very High"—the worst performance among all U.S. counties measured. The county faces extreme exposure across every major disaster category except hurricanes.
California's most at-risk county
Los Angeles County ranks 1st in composite disaster risk across all California counties, far exceeding the state average of 88.7 and dominating every risk comparison. Its scale, density, and geographic exposure create unmatched vulnerability.
Far riskier than surrounding areas
Los Angeles County's 100.0 score dramatically exceeds all neighboring counties, including Ventura and San Bernardino, reflecting its massive population, extended coastline, and fault-line exposure. No peer county approaches LA's risk concentration.
Earthquake, wildfire, and flood threats
Los Angeles County faces perfect or near-perfect scores in earthquake risk (100.0), wildfire risk (99.9), and flood risk (100.0), creating a perfect storm of natural hazards. Tornado risk (97.7) adds a fourth significant threat, making LA the nation's most comprehensively exposed county.
Maximum insurance and preparedness
LA County residents must secure earthquake insurance, dedicated wildfire coverage, and robust flood insurance to protect their homes against the county's extreme, multi-hazard risk profile. Establish emergency plans and secure your home's structural integrity against all four major threats.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Los Angeles County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Los Angeles County
Risk Verdict
Los Angeles County's composite risk score at the 100th percentile nationally reflects extreme multi-hazard exposure that demands active preparedness. Residents should prioritize a formal household emergency plan, including evacuation routes, insurance review, and a well-stocked emergency kit.
Hazard Breakdown
Flood risk is Los Angeles County's dominant natural hazard, ranked at the 100th percentile nationally under FEMA's National Risk Index. Earthquake ranks second at the 100th percentile nationally. Additional tracked hazards include wildfire (100th percentile), tornado (98th percentile), hurricane (0th percentile).
Preparedness Context
Flood risk is Los Angeles County's top hazard at the 100th percentile nationally. Households in or near designated flood zones face elevated financial exposure; flood insurance typically requires a 30-day waiting period before it takes effect, so applying before the season is advisable. The county's second-ranked hazard, earthquake at the 100th percentile nationally, means Los Angeles County residents face compounding risks from multiple natural hazard types during peak seasons. Households across Los Angeles County should identify the nearest community shelter and keep a basic emergency kit — water, non-perishable food, medications, flashlight, and battery radio — in a location easy to grab quickly.
Regional Context
Los Angeles County is 11.3 composite risk points above the California average, indicating that residents face greater natural hazard exposure than most of their in-state neighbors.
Is your household prepared for Los Angeles County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Los Angeles County, CA?
What types of natural hazards affect Los Angeles County?
How does Los Angeles County risk compare to the California average?
Is Los Angeles County at risk for flooding?
How is natural disaster risk measured?
Why is Los Angeles County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.