Washington landslide risk
Snohomish County has the highest landslide risk in Washington, scoring 100 out of 100 — rated "Very High" by FEMA's National Risk Index. Recorded landslide events across Washington have decreased 54% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Snohomish County | 100 | Very High | 1 |
| 2 | Island County | 99.9 | Relatively High | 0 |
| 3 | Kitsap County | 99.2 | Relatively High | 0 |
| 4 | King County | 99 | Relatively High | 1 |
| 5 | Thurston County | 99 | Relatively High | 0 |
| 6 | Yakima County | 98.4 | Relatively High | 0 |
| 7 | Kittitas County | 98.2 | Relatively High | 0 |
| 8 | Mason County | 98.1 | Relatively High | 0 |
| 9 | Whatcom County | 97.7 | Relatively Moderate | 0 |
| 10 | Pierce County | 97 | Relatively Moderate | 2 |
| 11 | Ferry County | 96.9 | Relatively Moderate | 6 |
| 12 | Lewis County | 96.5 | Relatively Moderate | 0 |
| 13 | Jefferson County | 96 | Relatively Moderate | 0 |
| 14 | Stevens County | 96 | Relatively Moderate | 3 |
| 15 | Chelan County | 95.5 | Relatively Moderate | 17 |
| 16 | Grays Harbor County | 95.3 | Relatively Moderate | 0 |
| 17 | Okanogan County | 94.9 | Relatively Moderate | 25 |
| 18 | Skagit County | 92.4 | Relatively Moderate | 0 |
| 19 | Whitman County | 91.7 | Relatively Moderate | 2 |
| 20 | Lincoln County | 91.4 | Relatively Moderate | 1 |
| 21 | Pend Oreille County | 90 | Relatively Moderate | 2 |
| 22 | Clallam County | 86.8 | Relatively Low | 0 |
| 23 | Pacific County | 84.7 | Relatively Low | 0 |
| 24 | Cowlitz County | 83.7 | Relatively Low | 2 |
| 25 | Clark County | 81.2 | Relatively Low | 0 |
| 26 | Skamania County | 81.2 | Relatively Low | 1 |
| 27 | Klickitat County | 80.7 | Relatively Low | 0 |
| 28 | Wahkiakum County | 80.6 | Relatively Low | 0 |
| 29 | Grant County | 78.9 | Relatively Low | 0 |
| 30 | Benton County | 77.5 | Relatively Low | 0 |
| 31 | Asotin County | 72.3 | Relatively Low | 0 |
| 32 | Walla Walla County | 69.6 | Relatively Low | 0 |
| 33 | Columbia County | 67.3 | Relatively Low | 0 |
| 34 | San Juan County | 62.3 | Very Low | 0 |
| 35 | Garfield County | 60.5 | Very Low | 0 |
| 36 | Spokane County | 56.9 | Very Low | 3 |
| 37 | Franklin County | 51.8 | Very Low | 0 |
| 38 | Douglas County | 49.9 | Very Low | 4 |
| 39 | Adams County | 32.1 | Very Low | 0 |
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.
Landslide risk nationally:
Other hazard risks in Washington:
Frequently asked questions
What is the highest landslide risk county in Washington?
Snohomish County, WA has the highest landslide risk in Washington, with a FEMA National Risk Index score of 100 out of 100 (rated "Very High").
How many counties in Washington are rated Very High for landslide risk?
1 of 39 scored Washington counties are rated "Very High" for landslide risk by FEMA's National Risk Index.
What causes landslide risk in Washington?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.