Utah inland flooding risk
Washington County has the highest inland flooding risk in Utah, scoring 93.4 out of 100 — rated "Relatively High" by FEMA's National Risk Index. Recorded inland flooding events across Utah have increased 132% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Washington County | 93.4 | Relatively High | 119 |
| 2 | Salt Lake County | 92.9 | Relatively Moderate | 15 |
| 3 | Utah County | 90.5 | Relatively Moderate | 18 |
| 4 | Weber County | 67.6 | Relatively Low | 4 |
| 5 | Davis County | 59.5 | Relatively Low | 5 |
| 6 | Kane County | 56.4 | Relatively Low | 90 |
| 7 | Summit County | 49.6 | Relatively Low | 1 |
| 8 | Garfield County | 48.8 | Relatively Low | 68 |
| 9 | Cache County | 45.8 | Relatively Low | 3 |
| 10 | Iron County | 44.6 | Relatively Low | 27 |
| 11 | Wasatch County | 32.3 | Very Low | 3 |
| 12 | Grand County | 25.4 | Very Low | 32 |
| 13 | Sanpete County | 24.5 | Very Low | 1 |
| 14 | San Juan County | 24 | Very Low | 13 |
| 15 | Carbon County | 22.8 | Very Low | 8 |
| 16 | Sevier County | 22.1 | Very Low | 3 |
| 17 | Box Elder County | 19.5 | Very Low | 5 |
| 18 | Tooele County | 18.3 | Very Low | 13 |
| 19 | Millard County | 16.3 | Very Low | 4 |
| 20 | Duchesne County | 15.3 | Very Low | 8 |
| 21 | Emery County | 12.4 | Very Low | 20 |
| 22 | Morgan County | 10.7 | Very Low | 1 |
| 23 | Uintah County | 10.3 | Very Low | 2 |
| 24 | Beaver County | 8 | Very Low | 4 |
| 25 | Wayne County | 6.9 | Very Low | 71 |
| 26 | Juab County | 4.8 | Very Low | 1 |
| 27 | Piute County | 3.4 | Very Low | 4 |
| 28 | Rich County | 3 | Very Low | 3 |
| 29 | Daggett County | 0.9 | Very Low | 1 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Inland Flooding risk nationally:
Other hazard risks in Utah:
Frequently asked questions
What is the highest inland flooding risk county in Utah?
Washington County, UT has the highest inland flooding risk in Utah, with a FEMA National Risk Index score of 93.4 out of 100 (rated "Relatively High").
What causes inland flooding risk in Utah?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.