Based on NOAA Storm Events Database records from 1996 to 2025, these are the Arizona counties with the most recorded flood events. Mohave County tops the list with 697 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.
| Rank | County | Total Events | River Floods | Flash Floods |
|---|---|---|---|---|
| 1 | Mohave County | 697 | 41 | 656 |
| 2 | Maricopa County | 661 | 81 | 580 |
| 3 | Pima County | 564 | 43 | 521 |
| 4 | Yavapai County | 350 | 32 | 318 |
| 5 | Coconino County | 325 | 47 | 278 |
| 6 | Gila County | 253 | 22 | 231 |
| 7 | Cochise County | 234 | 14 | 220 |
| 8 | Pinal County | 157 | 26 | 131 |
| 9 | Navajo County | 141 | 28 | 113 |
| 10 | La Paz County | 133 | 8 | 125 |
| 11 | Apache County | 107 | 9 | 98 |
| 12 | Santa Cruz County | 86 | 3 | 83 |
| 13 | Yuma County | 72 | 16 | 56 |
| 14 | Graham County | 52 | 3 | 49 |
| 15 | Greenlee County | 26 | 5 | 21 |
Source: NOAA Storm Events Database (1996–2025).
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