FEMA Records
2
Total declarations
Wisconsin · FEMA + NOAA + National Risk Index
Waukesha County, WI
2 FEMA disaster declarations (2025–2026), with a FEMA National Risk Index rating of Relatively Moderate. Most common hazard: Flood.
- 2
- FEMA declarations
- 2
- Major disasters
- 89
- NRI risk · Relatively Moderate
- Flood
- Top hazard
The verdict
Waukesha County ranks in the riskiest 11% of U.S. counties for FEMA-modeled hazard risk, with more federally declared disasters than 22% of the 2,791 counties FEMA tracks. FEMA rates the county's overall risk as Relatively Moderate, based on 2 federal disaster declarations recorded since 2025, most often flood, 48% below the national county average of 4.
- Riskiest 11%
- of U.S. counties for FEMA National Risk Index score
- Relatively Moderate
- FEMA National Risk Index rating
- 2
- FEMA declarations vs 4 national county avg
- 2
- flood declarations, the most common hazard here
FEMA's National Risk Index score reflects expected annual loss, social vulnerability, and community resilience; the declaration count above reflects only Presidentially declared disasters, not every hazard event.
How does Waukesha County compare?
Waukesha County vs. every U.S. county
FEMA disaster declarations, all-time
2 22nd percentile higher than 22% of 2,791 counties
Each bar is a band; taller bars hold more counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source FEMA Disaster Declarations Summaries v2 · 2026-07-25
Waukesha County's FEMA Risk Index score
FEMA National Risk Index composite score vs. the Wisconsin county average
How disaster-prone is Waukesha County?
Declaration frequency
Waukesha County, Wisconsin has recorded 2 FEMA disaster declarations between 2025 and 2026, of which 2 were classified as Major Disaster declarations (DR) requiring federal individual and public assistance. That puts the county's average at 2.0 declarations per year across a 1-year record, or roughly 56% above the Wisconsin county average of 1.3 and 48% below the national county average of 3.8. The dominant disaster type on record is Flood, with 2 of 2 declarations falling under this category.
FEMA National Risk Index
This county sits among the highest-risk counties nationally on FEMA's National Risk Index, a composite score of 88.9/100 (Relatively Moderate). Expected Annual Loss is rated Relatively Moderate (roughly $138.3M in annualized losses). Social vulnerability reads Very Low and community resilience Very High, both critical modifiers of realized harm here. Of the 18 hazards FEMA models, Cold Wave stands out as the sharpest exposure here, rated Relatively High.
Flood exposure & the bottom line
Taken together, Waukesha County reads as low relative risk on this historical lens, fewer federally recognized disasters than a typical U.S. county.
Risk Assessment
Risk Level
Low
vs. Wisconsin Avg
+56%
State avg: 1.3
vs. National Avg
-48%
National avg: 3.8
Avg Per Year
2.0
Over 1 years
FEMA NRI 8-hazard radar - Waukesha County
How to read this radar
The radar plots Waukesha County's relative exposure to the eight headline natural hazards used by the FEMA National Risk Index. Each axis is the qualitative NRI risk rating (Very Low through Very High) re-expressed on a 0-100 scale so that the polygon shape lets you compare a county against another at a glance. A rounder polygon means broad multi-hazard exposure; a spiky polygon means one or two dominant hazards drive most of the modeled risk.
NRI Source
FEMA 2023
Latest NRI release
County FIPS
55133
WI state code
Source: FEMA National Risk Index FEMA National Risk Index Per-county per-hazard ratings, 2023 release
Disaster Types
Flood 2
Declaration Types
What DR / EM / FM mean
FEMA categorizes declarations as Major Disasters (DR), Emergencies (EM), or Fire Management Assistance (FM).
Major Disaster - 2 100.0%
of all 2 declarations
FEMA Declarations Timeline
| Year | Declarations | |
|---|---|---|
| 2026 | 1 | |
| 2025 | 1 | |
Disaster Declarations
| DR# | Title | Type | Incident | Date |
|---|---|---|---|---|
| 4923 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Flood | 2026-06-30 |
| 4892 | SEVERE STORMS, STRAIGHT-LINE WINDS, FLOODING, AND MUDSLIDES | DR | Flood | 2025-09-11 |
Storm Events in Wisconsin
| Storm Type | Events | Fatalities | Injuries | Property Damage |
|---|---|---|---|---|
| Thunderstorm Wind | 4,156 | 6 | 29 | $47.9M |
| Hail | 3,280 | 0 | 0 | $58.6M |
| Winter Weather | 2,434 | 44 | 152 | $2.1M |
| Winter Storm | 1,545 | 16 | 88 | $2.4M |
| Heavy Snow | 855 | 2 | 3 | $490.0K |
Source: NOAA Storm Events Database NOAA Storm Events Database State-level aggregated data, 2015–2025
FEMA National Risk Index
Overall Risk
Relatively Moderate
Score: 88.9/100
Expected Annual Loss
Relatively Moderate
$138.3M/year
Social Vulnerability
Very Low
Community Resilience
Very High
Hazard Risk Breakdown
Cold Wave Relatively High
Hail Relatively High
Tornado Relatively High
Heat Wave Relatively Moderate
Winter Weather Relatively High
Ice Storm Relatively Moderate
Landslide Relatively Low
Lightning Relatively Moderate
Earthquake Very Low
Strong Wind Relatively Moderate
Wildfire Very Low
Drought Relatively Low
Hurricane Very Low
Source: FEMA National Risk Index (NRI) FEMA National Risk Index (NRI) Ratings reflect relative scores among all US counties. Data: hazards.fema.gov/nri
Counties with Similar Risk in Wisconsin
Disaster Preparedness Guides
Related
Frequently Asked Questions
How many natural disasters has Waukesha County, Wisconsin had?
Waukesha County, Wisconsin has received 2 FEMA disaster declarations from 2025 to 2026. Of these, 2 were major disaster declarations.
What is the most common disaster type in Waukesha County?
The most common disaster type in Waukesha County is Flood, with 2 declarations.
How does Waukesha County's disaster risk compare to the Wisconsin average?
Waukesha County has 2 disaster declarations, which is 56% higher than the Wisconsin county average of 1.3 declarations. Compared to the national county average of 3.8, it is 48% lower.
How many major FEMA disaster declarations has Waukesha County received?
Waukesha County has received 2 major disaster declarations, representing 100% of all 2 disaster declarations. Major disaster declarations typically involve significant damage requiring federal assistance.
What types of storms are most common in Wisconsin?
The most common storm types in Wisconsin include Thunderstorm Wind (4,156 events), Hail (3,280 events), Winter Weather (2,434 events). NOAA storm event data covers severe weather from 2015 to 2025.
What was the worst year for disasters in Waukesha County?
The most active year for disaster declarations in Waukesha County was 2025, with 1 declaration. The county has FEMA disaster data spanning 2025 to 2026.
What is the overall disaster risk level for Waukesha County?
Waukesha County's 2 FEMA disaster declarations put it in the low-risk band, fewer federally recognized disasters than a typical U.S. county over the same span.
What is the FEMA National Risk Index score for Waukesha County?
According to the FEMA National Risk Index, Waukesha County, Wisconsin has an overall risk score of 88.9 out of 100 (Relatively Moderate). The county's social vulnerability rating is Very Low and community resilience is Very High. The Expected Annual Loss (EAL) score is Relatively Moderate, representing $138.3M in annualized losses.
Which natural hazard poses the greatest risk to Waukesha County?
Based on FEMA NRI data, the highest-risk natural hazard in Waukesha County is Cold Wave (risk rating: Relatively High). Other significant hazards include Hail (Relatively High) and Tornado (Relatively High). These scores are based on FEMA's analysis of historical event frequency, exposed assets, and community vulnerability.
Data Sources & Methodology
Disaster declaration data comes from the FEMA OpenFEMA Disaster Declarations Summaries v2 API, which includes all federally declared disasters, emergencies, and fire management assistance grants.
Storm event data is sourced from the NOAA Storm Events Database (2015–2025), which tracks significant weather events including thunderstorms, tornadoes, floods, and winter storms.
This data is provided for informational purposes only. FEMA disaster declarations represent federal response actions and may not capture all local emergencies or weather events.
What this means for Waukesha County
Waukesha County, WI runs 56% above the Wisconsin county average for federal disaster declarations (2 vs 1), a low historical load overall.
- Its most common federal declaration type is major disaster (2 of 2) - know the hazards most likely here before they happen. Wisconsin overview
- See how this county ranks against the rest of the country for disaster frequency. Most-disaster rankings
- Read how to read FEMA declarations, NRI risk scores, and what they do and don't tell you. Disaster-data guide
Historical declaration counts describe past federal response, not a forecast. For current threats, follow the National Weather Service and local officials; in an emergency call 911.
According to the Federal Emergency Management Agency, this profile draws on 2,791 tracked U.S. counties in FEMA's Disaster Declarations Summaries dataset, refreshed as of 2026-07-25. Read our methodology - how this data is sourced, computed, and verified.
All federal data sources used on this page
- FEMA OpenFEMA, Disaster Declarations Summaries v2 - all federally-declared disasters for this county. fema.gov/openfema/disaster-declarations
- FEMA National Risk Index (NRI) - per-county per-hazard risk ratings and expected annual loss. hazards.fema.gov/nri
- NOAA NCEI Storm Events Database - state-level storm/severe-weather event records, 2015–2025. ncdc.noaa.gov/stormevents
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainHazard Editorial
Verify with FEMA → · Verify with FEMA NRI → · Verify with NOAA →
Every figure on PlainHazard is rendered directly from FEMA federal disaster data, no number is typed in by an editor. This page draws directly on FEMA federal disaster data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or national statistics report, or report a data error.