Middlesex County Disaster Risk
Middlesex County, New Jersey
FEMA Risk Rating
Relatively High
National Percentile
98th
of 3,144 counties
State Rank
#2
of 21 (1 = highest risk)
Flood Risk
99th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Relatively High
Higher than 99% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Relatively Low
Higher than 80% of US counties
Tornado
Tornado and severe thunderstorm risk
Relatively High
Higher than 94% of US counties
Earthquake
Seismic activity and ground shaking risk
Relatively High
Higher than 96% of US counties
Hurricane
Tropical cyclone and hurricane risk
Moderate
Higher than 93% of US counties
Risk Overview
About Natural Disaster Risk in Middlesex County, New Jersey
Middlesex County ranks among riskiest nationally
Middlesex County scores 97.77 out of 100 for composite disaster risk, making it the highest-scoring county in this dataset and well above national and state averages. This exceptional risk reflects multiple significant hazards converging across a densely populated region.
New Jersey's single riskiest county
Middlesex County ranks as the most at-risk county statewide with a composite score of 97.77, outpacing the state average of 90.81 by nearly 7 points. No other New Jersey county exceeds this risk level.
Riskier than all adjacent counties
Middlesex County (97.77) substantially exceeds Hudson County (97.23), Mercer County (95.36), and Morris County (92.88). Its combination of coastal exposure, urbanization, and infrastructure density amplifies risk across virtually all hazard categories.
Floods, tornadoes, and earthquakes
Middlesex County faces the nation's highest flood risks at 98.86, driven by extensive waterfront exposure, coastal geography, and stormwater challenges. Tornado risk (94.50) is exceptionally high, earthquake risk scores 96.25, and wildfire risk (79.71) reflects significant forest and grassland coverage throughout the county.
Make disaster insurance non-negotiable
Middlesex County residents must secure flood insurance immediately—this is the single most important step, given the county's 98.86 flood risk score. Layer in earthquake, tornado, and wind coverage, and develop a multi-hazard emergency plan with your household.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Middlesex County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Middlesex County
Risk Verdict
FEMA's National Risk Index places Middlesex County at the 98th percentile nationally — in the high-risk bracket for U.S. counties. Residents should prioritize a formal household emergency plan, including evacuation routes, insurance review, and a well-stocked emergency kit.
Hazard Breakdown
Flood risk is Middlesex County's dominant natural hazard, ranked at the 99th percentile nationally under FEMA's National Risk Index. Earthquake ranks second at the 96th percentile nationally. Additional tracked hazards include tornado (94th percentile), hurricane (93th percentile), wildfire (80th percentile).
Preparedness Context
Flood risk is Middlesex County's top hazard at the 99th 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. Alongside flooding, earthquake exposure at the 96th percentile means households benefit from a multi-hazard preparedness plan rather than focusing on flood alone. Households across Middlesex 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
Middlesex County is 7.0 composite risk points above the New Jersey average, indicating that residents face greater natural hazard exposure than most of their in-state neighbors.
Is your household prepared for Middlesex County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Middlesex County, NJ?
What types of natural hazards affect Middlesex County?
How does Middlesex County risk compare to the New Jersey average?
Is Middlesex County at risk for flooding?
How is natural disaster risk measured?
Why is Middlesex 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.