Columbia County, Wisconsin Natural Disaster Risk
FEMA National Risk Index assessment · WI
MediumComposite Risk Score
National percentile: 81th
Columbia County faces medium composite natural disaster risk (NRI Risk Index score 81.4, 81th national percentile), driven primarily by hail and cold wave exposure. Expected annual loss across all 18 hazard types is $51M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
FEMA's National Risk Index rates Columbia County at medium composite risk, with a National Risk Index score of 81.4 out of 100 — placing it in the 81st 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.
Most of Columbia County's expected losses come from hail (ice stones from severe thunderstorms that damage property and crops) at Very High risk — $21M in expected annual loss and about 3.64 events per year; cold wave (prolonged spells of dangerously low temperatures) at Medium risk — $5M in expected annual loss and about 5.95 events per year; and heat wave (prolonged periods of extreme heat that threaten health and infrastructure) at Medium risk — $2M in expected annual loss and about 2.79 events per year. Across all hazards, FEMA estimates $51M in expected annual loss for a population of 58K.
Beyond physical exposure, Columbia County has a low social vulnerability rating (how susceptible the population is to harm) and a very high community resilience rating (its capacity to prepare for and recover from disasters). A less vulnerable population paired with strong resilience helps the community absorb and recover from events.
The federal record bears this out: Columbia County has received 11 federal disaster declarations since 1976, including 5 for severe storm events and 2 for biological events. The most recent was Covid-19 Pandemic (biological), declared in April 2020.
Among 72 Wisconsin counties, Columbia County ranks #10 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Hail | Very High | 3.64 / yr | $21M |
| Cold Wave | Medium | 5.95 / yr | $5M |
| Heat Wave | Medium | 2.79 / yr | $2M |
| Tornado | Medium | 0.58 / yr | $4M |
| Riverine Flood | Medium | 1.96 / yr | $19M |
| Landslide | Low | 0.16 / yr | $9K |
| Strong Wind | Medium | 3.82 / yr | $1M |
| Winter Weather | Low | 15.53 / yr | $77K |
| Wildfire | Very Low | 0.00 / yr | $34K |
| Drought | Low | 2.46 / yr | $67K |
| Lightning | Low | 35.52 / yr | $165K |
| Ice Storm | Low | 0.43 / yr | $50K |
| Earthquake | Very Low | 0.00 / yr | $74K |
| Hurricane | Very Low | 0.01 / yr | $2K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Columbia County has received 11 federal disaster declarations since 1976, most recently Covid-19 Pandemic in April 2020. Most frequent causes: Severe Storm (5), Biological (2), Hurricane (1).
| Declared | Type | Disaster |
|---|---|---|
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| June 2008 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
| August 2007 | Severe Storm | Severe Storms and Flooding |
| September 2005 | Hurricane | Hurricane Katrina Evacuation |
| June 2004 | Severe Storm | Severe Storms and Flooding |
| January 2001 | Snowstorm | Snow |
| June 2000 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
| July 1993 | Severe Storm | Severe Storms, Tornadoes & Flooding |
| June 1976 | Drought | Drought |
Showing the 10 most recent of 11 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Columbia County?
Columbia County has a composite FEMA National Risk Index score of 81.4 out of 100, placing it in the Medium category and the 81th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Columbia County?
The three highest-rated hazards are Hail (Very High, $21M EAL), Cold Wave (Medium, $5M EAL), Heat Wave (Medium, $2M EAL). These account for most of the county's expected annual losses.
How does Columbia County compare to other Wisconsin counties?
Columbia County ranks #10 of 72 Wisconsin counties for overall natural disaster risk, with a medium rating.
How many federally declared disasters has Columbia County had?
FEMA records 11 federal disaster declarations for Columbia County since 1976, most often 5 for severe storm events and 2 for biological events. The most recent was Covid-19 Pandemic, declared in April 2020.
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. Columbia County's $51M EAL is a statistical average, not a guarantee for any specific year or address.