Maricopa County Disaster Risk
Maricopa County, Arizona
FEMA Risk Rating
Very High
National Percentile
100th
of 3,144 counties
State Rank
#1
of 15 (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 84% of US counties
Earthquake
Seismic activity and ground shaking risk
Relatively High
Higher than 97% of US counties
Hurricane
Tropical cyclone and hurricane risk
Very Low
Higher than 27% of US counties
Risk Overview
About Natural Disaster Risk in Maricopa County, Arizona
Maricopa County faces extreme risks
Maricopa County scores 99.87 on the composite risk scale, earning a "Very High" rating and sitting far above Arizona's state average of 84.45. The state's most populous and hazard-exposed county faces nearly maximum composite risk across multiple disaster types.
Arizona's highest-risk county by far
Maricopa County ranks as Arizona's most hazard-exposed county, with a composite score that dwarfs all peers. Its 99.87 rating reflects extreme exposure to floods, wildfires, tornadoes, and earthquakes in a densely populated region.
Dramatically riskier than surrounding areas
Maricopa County's 99.87 score vastly exceeds La Paz County (83.52) to the west and Gila County (90.17) to the north. Its extreme rating is unmatched in the state, reflecting the convergence of urban density and multiple overlapping hazards.
Multiple severe hazards converge here
Maricopa County faces near-maximum flood risk (99.87), extreme wildfire exposure (99.62), and exceptionally high tornado (84.00) and earthquake risk (96.82). This unprecedented concentration of hazards makes it the state's most disaster-prone county.
Comprehensive coverage is non-negotiable
Maricopa County residents must secure wildfire and flood insurance beyond standard homeowners policies, given both score above 99. Earthquake and tornado coverage should also be evaluated, particularly for properties in areas with older construction.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Maricopa County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Maricopa County
Risk Verdict
FEMA's composite risk model places Maricopa County at the 100th percentile nationally — one of the country's highest natural hazard exposure zones. Comprehensive household preparedness — including reviewing insurance, maintaining emergency supplies, and knowing evacuation routes — is strongly recommended.
Hazard Breakdown
Flood risk is Maricopa County's dominant natural hazard, ranked at the 100th percentile nationally under FEMA's National Risk Index. Wildfire ranks second at the 100th percentile nationally. Additional tracked hazards include earthquake (97th percentile), tornado (84th percentile), hurricane (27th percentile).
Preparedness Context
Maricopa County sits at the 100th percentile nationally for flood exposure. Knowing your property's flood zone designation — available at FEMA's Flood Map Service Center — is the first step toward understanding actual exposure and insurance options. Secondary wildfire exposure at the 100th percentile adds a second preparedness layer; households should review coverage options and alert sign-up for both hazard types. Regardless of specific hazard, Maricopa County households benefit from a practiced communication plan: a designated out-of-state contact and a pre-agreed evacuation destination established before the season's peak risk period.
Regional Context
Compared to other Arizona counties, Maricopa County runs 15.4 composite risk points higher than the state mean — reflecting above-average hazard concentration in this area.
Is your household prepared for Maricopa County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Maricopa County, AZ?
What types of natural hazards affect Maricopa County?
How does Maricopa County risk compare to the Arizona average?
Is Maricopa County at risk for flooding?
How is natural disaster risk measured?
Why is Maricopa 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.