Natural Hazard Loss Profile
Expected annual loss across the 18 natural hazards in FEMA's National Risk Index. Life safety is expressed in fatality-equivalents, combining expected deaths and injuries. Property loss counts building damage only, not agriculture.
These figures cover natural hazards only. Structure fire, EMS, and motor vehicle incidents are not in the National Risk Index, so this is not an all-cause life safety measure. For Williamson County, the largest single contributor is Cold Wave, 50% of the life-safety total.
Williamson County carries an expected 2 natural hazard fatality-equivalents and $71.1M in building loss per year. Rank chips compare the 95 Tennessee counties. Nationally, Williamson County ranks 288th of 3,222 U.S. counties for life-safety loss, 2153rd for life safety per 100k residents, 301st for property loss, and 2075th for property loss per resident. Computed from census tract data covering every resident, independent of fire department boundaries.
Add fire mortality, cause, and loss
Natural hazard exposure is only part of the risk. Fire deaths and injuries, cause of ignition, and dollar loss per incident come from NERIS incident reporting, which grows as departments serving Williamson County enroll. Our Regional tier adds that data for the departments your jurisdiction sponsors, next to public risk and NERIS adoption for every department in Williamson County.
Talk to us about Williamson County See what a department seesLoss Breakdown
Total expected annual loss: $98,024,637 per year. Life safety is shown here in dollars, at FEMA's $13.7M value of statistical life, so the three shares sum to the total.
Hazards Ranked Two Ways
The hazard that threatens people is often not the hazard that destroys buildings. Both columns cover the same 18 hazards over the same year.
By life-safety loss ($/yr)
By property loss ($/yr)
Census Tract Risk Map
Shaded by quintile across the census tracts in Williamson County. Gray tracts have no modeled loss or no resident population. Per-resident figures on this map use the National Risk Index 2020 tract population.
Fire Service Profile
Department composition covers the 7 departments registered in NERIS Public for Williamson County, TN. Departments that have not registered are not counted. Station coverage divides census population by registered stations; department service areas overlap, so their populations are not summed.
Department Rankings
Fire and EMS departments serving Williamson County. Click column headers to sort.
NRI Rating is from FEMA's National Risk Index, which measures community risk across 18 natural hazards using expected annual losses, social vulnerability, and community resilience. Life-Safety Loss uses FEMA's Value of Statistical Life ($13.7M per expected fatality) to estimate annual risk to human life.
Department boundaries and station counts are self-reported through NERIS Public and may not reflect current service areas. Population and Life-Safety Loss reflect each department's full jurisdiction. County-level risk metrics are computed from census tract data and are not affected by boundary accuracy. See full methodology.
| Department ▲ | Est. Population ▲ | Life-Safety Loss ▼ | NRI Rating ▲ | Stations ▲ |
|---|---|---|---|---|
| Franklin Fire Department | 88,508 | $9.4M | Relatively High | 9 |
| Spring Hill Fire Department | 60,950 | $7.7M | Relatively High | 5 |
| Brentwood Fire & Rescue Department | 44,152 | $4.8M | Relatively Moderate | 5 |
| Williamson County Fire & Rescue | 47,835 | $4.7M | Relatively Moderate | 8 |
| Nolensville Fire & Rescue | 20,451 | $1.7M | Relatively Moderate | 4 |
| Fairview Fire Department | 10,791 | $970.4K | Relatively Low | 2 |
| Arrington Volunteer Fire Department | 8,038 | $636.4K | Relatively High | 4 |
Risk Snapshot
FEMA Disaster Declarations
Every department in your region, on one briefing
Our Regional tier gives state fire marshals and county fire authorities one briefing across every department in the jurisdiction: priority tracts ranked by risk and demand, NERIS adoption by county, and a quarterly report with a page per department. Response times appear for the departments you sponsor. Free 90-day pilot.
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