Based on NOAA Storm Events Database records from 1996 to 2025, these are the Utah counties with the most recorded flood events. Washington County tops the list with 292 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.
| Rank | County | Total Events | River Floods | Flash Floods |
|---|---|---|---|---|
| 1 | Washington County | 292 | 15 | 277 |
| 2 | Kane County | 208 | 7 | 201 |
| 3 | Wayne County | 164 | 5 | 159 |
| 4 | Garfield County | 140 | 5 | 135 |
| 5 | Grand County | 94 | 15 | 79 |
| 6 | San Juan County | 69 | 10 | 59 |
| 7 | Iron County | 53 | 1 | 52 |
| 8 | Emery County | 49 | 3 | 46 |
| 9 | Salt Lake County | 43 | 14 | 29 |
| 10 | Utah County | 36 | 5 | 31 |
| 11 | Tooele County | 24 | 7 | 17 |
| 12 | Duchesne County | 21 | 6 | 15 |
| 13 | Carbon County | 19 | 1 | 18 |
| 14 | Weber County | 18 | 14 | 4 |
| 15 | Cache County | 16 | 13 | 3 |
| 16 | Uintah County | 15 | 4 | 11 |
| 17 | Sevier County | 14 | 2 | 12 |
| 18 | Davis County | 13 | 3 | 10 |
| 19 | Sanpete County | 13 | 2 | 11 |
| 20 | Daggett County | 11 | 1 | 10 |
| 21 | Piute County | 11 | 1 | 10 |
| 22 | Millard County | 10 | 3 | 7 |
| 23 | Morgan County | 7 | 6 | 1 |
| 24 | Box Elder County | 6 | 4 | 2 |
| 25 | Summit County | 6 | 5 | 1 |
| 26 | Beaver County | 4 | 0 | 4 |
| 27 | Juab County | 3 | 0 | 3 |
| 28 | Rich County | 3 | 2 | 1 |
| 29 | Wasatch County | 3 | 1 | 2 |
Source: NOAA Storm Events Database (1996–2025).
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