Bon Homme County, SD
FEMA National Risk Index scores, disaster declarations & hazard data
Bon Homme County has experienced 32 federally declared disasters since 1976, most recently Severe Storms, Straight-Line Winds, And Flooding in 2024. Its overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Bon Homme County's highest-rated hazards are drought, ice storm, and winter weather, with its top risk rated "Relatively Moderate" by FEMA's National Risk Index. Recorded storm events have decreased 49% over the past five years compared to the prior five-year period. Community vulnerability is relatively low (19th percentile nationally), indicating stronger recovery capacity than most US counties.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Bon Homme County has been designated in 32 declarations since 1976, covering 6 disaster types including biological (18), severe storm (6), flood (5).
| Year | Type | Event name |
|---|---|---|
| 2024 | Flood | Severe Storms, Straight-Line Winds, And Flooding |
| 2022 | Severe Storm | Severe Storm, Straight-Line Winds, Tornadoes, And Flooding |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 Pandemic |
Showing the 10 most recent of 32 total declarations since 1976.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 53.5 | 0 | 0 | — |
| Inland Flooding | Very Low | 8.9 | 80 | 0 | $2.8M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 13.6 | 1 | — | — |
| Heat Wave | Very Low | 23.2 | 21 | 0 | — |
| Tornado | Relatively Low | 33.2 | 3 | 0 | $6K |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Relatively Low | 52.2 | 44 | 0 | — |
| Strong Wind | Relatively Low | 24.9 | 0 | 0 | — |
| Winter Weather | Relatively Low | 59.8 | 0 | 0 | — |
| Ice Storm | Relatively Moderate | 62.4 | — | — | — |
| Cold Wave | Relatively Low | 50.8 | — | — | — |
| Lightning | Very Low | 13.3 | 0 | 0 | — |
| Drought | Relatively Moderate | 85.7 | 0 | 0 | — |
| Landslide | Very Low | 35.7 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Bon Homme County ranks in the 19th percentile (Very low) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 19th | Very low |
| Socioeconomic status | 31st | Low |
| Household characteristics | 5th | Very low |
| Racial & ethnic minority status | 40th | Low |
| Housing type & transportation | 30th | Low |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 46th | Relatively Moderate |
| Risk to homes | 52nd | Relatively Moderate |
| Buildings in direct exposure zone | 63.3% | — |
NOAA tracked 148 weather events in this county over 2016–2025: 98 in 2016–20 vs 50 in 2021–25 (-49% — frequency decreasing).
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Bon Homme County?
According to the FEMA National Risk Index, the highest-risk hazards in Bon Homme County, South Dakota are drought, ice storm, and winter weather. The county's overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Has Bon Homme County received federal disaster declarations?
Yes. Bon Homme County has received 32 federal disaster declarations since 1976, including declarations in 2024. The most common disaster type on record is biological (18 declarations).
Has Bon Homme County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Bon Homme County include Severe Storms, Straight-Line Winds, And Flooding (2024). See the declarations table above for the full history since 1976.
How does Bon Homme County's natural hazard risk compare to nearby counties?
Among neighboring counties, Yankton County, SD has the highest overall natural hazard risk (Relatively Low) and Douglas County, SD has the lowest (Very Low). Bon Homme County is rated Very Low overall.
How is Bon Homme County's composite disaster risk index calculated?
Bon Homme County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Bon Homme County's composite score of 11 means its overall natural hazard risk is higher than 11% of US counties.