Walworth County, South Dakota: hazard risk
FEMA rates Walworth County's overall risk Very Low (score 39.5 of 100, higher than 39% of rated U.S. counties). Its storm record holds 663 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Cold Wave | Relatively Moderate | 88.8 | $5.3M |
| Winter Weather | Relatively Moderate | 82.3 | $196K |
| Wildfire | Relatively Low | 80.7 | $361K |
| Hail | Relatively Low | 63.5 | $356K |
| Drought | Relatively Low | 41.8 | $66K |
| Tornado | Relatively Low | 27.7 | $367K |
| Strong Wind | Relatively Low | 18.5 | $134K |
| Riverine Flooding | Very Low | 34.8 | $3.4M |
| Ice Storm | Very Low | 27.0 | $22K |
| Heat Wave | Very Low | 18.4 | $44K |
| Lightning | Very Low | 11.1 | $31K |
| Earthquake | Very Low | 7.0 | $6K |
| Landslide | Very Low | 4.2 | $5 |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Severe thunderstorm wind | 190 | 0 | $101K | 9th of 66 | 1725th of 3,080 |
| Hail | 178 | 0 | – | 23rd of 66 | 1039th of 3,080 |
| Winter storms | 91 | 1 | – | 36th of 66 | 1191st of 3,077 |
| High wind and dust storms | 68 | 0 | – | 11th of 66 | 370th of 3,080 |
| Extreme cold | 41 | 1 | – | 13th of 66 | 391st of 3,076 |
| Drought | 35 | 0 | – | 23rd of 66 | 952nd of 3,063 |
| Tornadoes | 28 | 0 | $4.3M | 22nd of 66 | 1578th of 3,080 |
| Floods | 18 | 0 | $7.5M | 38th of 66 | 2219th of 3,080 |
| Heat | 8 | 0 | – | 32nd of 66 | 1390th of 3,076 |
| Wildfires | 1 | 0 | – | 20th of 66 | 1033rd of 2,972 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Walworth County record: every hazard by year and month, the deadliest events and FEMA's declarations.