Riverside County Disaster Risk
Riverside County, California
FEMA Risk Rating
Very High
National Percentile
100th
of 3,144 counties
State Rank
#2
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
Moderate
Higher than 87% 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 12% of US counties
Risk Overview
About Natural Disaster Risk in Riverside County, California
Riverside ranks among nation's highest-risk counties
With a composite risk score of 99.90 out of 100, Riverside County faces significantly elevated natural disaster threats compared to the typical U.S. county. This "Very High" rating places it well above California's state average of 88.72, indicating exposure to multiple concurrent hazards.
Second-most dangerous county in California
Riverside ranks near the top of California's 58 counties for overall natural disaster risk, exceeded only by a handful of peers. The county's scores reflect extreme exposure to earthquakes (99.81), wildfires (99.97), and floods (99.90)—each individually at dangerous levels.
Riskier than San Bernardino and inland neighbors
Riverside's 99.90 score slightly exceeds San Bernardino County (99.84) and substantially outpaces San Benito (85.24) and San Luis Obispo (95.90) counties. The Inland Empire's twin counties both face extreme multi-hazard risk, making the region California's most disaster-prone.
Wildfires, earthquakes, and floods dominate
Wildfire risk scores 99.97—the highest in the state—with recent fire seasons destroying thousands of structures annually. Earthquake (99.81) and flood (99.90) risks are equally severe, meaning most Riverside properties face credible threats from all three hazards simultaneously.
Comprehensive coverage is essential here
Standard homeowners insurance excludes both earthquakes and wildfires, leaving most Riverside residents significantly underinsured. Consider adding earthquake and wildfire riders to your policy immediately—and verify flood coverage if you're in a mapped flood zone or near rivers.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Riverside County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Riverside County
Risk Verdict
Riverside 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
Wildfire risk is Riverside County's dominant natural hazard, ranked at the 100th percentile nationally under FEMA's National Risk Index. Flood ranks second at the 100th percentile nationally. Additional tracked hazards include earthquake (100th percentile), tornado (87th percentile), hurricane (12th percentile).
Preparedness Context
With wildfire ranked at the 100th percentile nationally, Riverside County is in a zone where air quality can deteriorate rapidly before structures are threatened. An N95 respirator and a HEPA air purifier are practical items for Riverside County households to have on hand before fire season. A secondary flood exposure at the 100th percentile nationally means Riverside County residents face hazards from two distinct natural peril categories during different seasons. Defensible space, insurance review, and an evacuation plan are the three preparedness pillars for Riverside County households — and the insurance review is the one most often deferred by Riverside County residents and most costly to skip when a fire event actually occurs.
Regional Context
Riverside County is 11.2 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 Riverside County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Riverside County, CA?
What types of natural hazards affect Riverside County?
How does Riverside County risk compare to the California average?
Is Riverside County at risk for wildfire?
How is natural disaster risk measured?
Why is Riverside 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.