Prince William County, Virginia Natural Disaster Risk
FEMA National Risk Index assessment · VA
MediumComposite Risk Score
National percentile: 83th
Prince William County faces medium composite natural disaster risk (NRI Risk Index score 83.2, 83th national percentile), driven primarily by heat wave and lightning exposure. Expected annual loss across all 18 hazard types is $69M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Prince William County carries a medium composite natural disaster risk, with a National Risk Index score of 83.2 out of 100 — placing it in the 83rd national percentile and near the national midpoint for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
The county's risk is driven primarily by heat wave (prolonged periods of extreme heat that threaten health and infrastructure) at Medium risk — $6M in expected annual loss and about 5.70 events per year; lightning (electrical discharges from storms that ignite fires and cause casualties) at High risk — $2M in expected annual loss and about 41.11 events per year; and winter weather (heavy snow, blizzards, and hazardous winter conditions) at High risk — $597K in expected annual loss and about 9.48 events per year. Across all hazards, FEMA estimates $69M in expected annual loss for a population of 481K.
Beyond physical exposure, Prince William County has a very low social vulnerability rating (how susceptible the population is to harm) and a medium community resilience rating (its capacity to prepare for and recover from disasters). Both measures sit toward the lower end, indicating relatively modest population sensitivity.
The federal record bears this out: Prince William County has received 20 federal disaster declarations since 1972, including 6 for hurricane events and 5 for snowstorm events. The most recent was Severe Winter Storm (winter storm), declared in January 2026.
Among 133 Virginia counties, Prince William County ranks #4 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Heat Wave | Medium | 5.70 / yr | $6M |
| Lightning | High | 41.11 / yr | $2M |
| Winter Weather | High | 9.48 / yr | $597K |
| Strong Wind | High | 7.13 / yr | $3M |
| Riverine Flood | Medium | 3.43 / yr | $45M |
| Hurricane | Medium | 0.08 / yr | $4M |
| Earthquake | Low | 0.00 / yr | $2M |
| Hail | Medium | 3.78 / yr | $1M |
| Tornado | Medium | 0.25 / yr | $5M |
| Landslide | Very Low | 0.26 / yr | $3K |
| Ice Storm | Low | 0.55 / yr | $155K |
| Drought | Low | 1.74 / yr | $274K |
| Coastal Flood | Low | 3.73 / yr | $110K |
| Cold Wave | Very Low | 1.36 / yr | $404K |
| Wildfire | Very Low | 0.00 / yr | $9K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Prince William County has received 20 federal disaster declarations since 1972, most recently Severe Winter Storm in January 2026. Most frequent causes: Hurricane (6), Snowstorm (5), Severe Storm (3).
| Declared | Type | Disaster |
|---|---|---|
| January 2026 | Winter Storm | Severe Winter Storm |
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| September 2018 | Hurricane | Hurricane Florence |
| March 2016 | Snowstorm | Severe Winter Storm and Snowstorm |
| November 2012 | Hurricane | Hurricane Sandy |
| October 2012 | Hurricane | Hurricane Sandy |
| November 2011 | Severe Storm | The Remnants of Tropical Storm Lee |
| April 2010 | Snowstorm | Severe Winter Storms and Snowstorms |
| February 2010 | Snowstorm | Severe Winter Storm and Snowstorm |
Showing the 10 most recent of 20 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Prince William County?
Prince William County has a composite FEMA National Risk Index score of 83.2 out of 100, placing it in the Medium category and the 83th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Prince William County?
The three highest-rated hazards are Heat Wave (Medium, $6M EAL), Lightning (High, $2M EAL), Winter Weather (High, $597K EAL). These account for most of the county's expected annual losses.
How does Prince William County compare to other Virginia counties?
Prince William County ranks #4 of 133 Virginia counties for overall natural disaster risk, with a medium rating.
How many federally declared disasters has Prince William County had?
FEMA records 20 federal disaster declarations for Prince William County since 1972, most often 6 for hurricane events and 5 for snowstorm events. The most recent was Severe Winter Storm, declared in January 2026.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Prince William County's $69M EAL is a statistical average, not a guarantee for any specific year or address.