Landslide Risk in Washington
All Washington counties ranked by FEMA National Risk Index landslide score
Landslide risk — downhill movement of rock, soil, and debris on unstable slopes — is rated for 39 of 39 Washington counties in FEMA's National Risk Index. Snohomish County carries the state's highest landslide score at 100.0, with $25M in expected annual landslide losses.
8 Washington counties are rated High or Very High for landslide, and expected annual losses from landslide total roughly $40M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Landslide
| # | County | Landslide Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Snohomish County | Very High | 4.12 / yr | $25M | |
| 2 | Island County | High | 0.40 / yr | $6M | |
| 3 | Kitsap County | High | 2.80 / yr | $2M | |
| 4 | King County | High | 4.28 / yr | $2M | |
| 5 | Thurston County | High | 5.08 / yr | $2M | |
| 6 | Yakima County | High | 4.51 / yr | $656K | |
| 7 | Kittitas County | High | 2.34 / yr | $657K | |
| 8 | Mason County | High | 10.89 / yr | $500K | |
| 9 | Whatcom County | Medium | 2.03 / yr | $559K | |
| 10 | Pierce County | Medium | 3.36 / yr | $366K | |
| 11 | Ferry County | Medium | 1.67 / yr | $165K | |
| 12 | Lewis County | Medium | 5.75 / yr | $195K | |
| 13 | Jefferson County | Medium | 17.00 / yr | $123K | |
| 14 | Stevens County | Medium | 1.12 / yr | $147K | |
| 15 | Chelan County | Medium | 3.98 / yr | $142K | |
| 16 | Grays Harbor County | Medium | 11.54 / yr | $113K | |
| 17 | Okanogan County | Medium | 4.50 / yr | $82K | |
| 18 | Skagit County | Medium | 2.50 / yr | $83K | |
| 19 | Whitman County | Medium | 1.99 / yr | $83K | |
| 20 | Lincoln County | Medium | 0.68 / yr | $50K | |
| 21 | Pend Oreille County | Medium | 0.68 / yr | $56K | |
| 22 | Clallam County | Low | 7.16 / yr | $29K | |
| 23 | Pacific County | Low | 4.43 / yr | $24K | |
| 24 | Cowlitz County | Low | 2.30 / yr | $26K | |
| 25 | Clark County | Low | 2.18 / yr | $24K | |
| 26 | Skamania County | Low | 2.77 / yr | $22K | |
| 27 | Klickitat County | Low | 0.69 / yr | $13K | |
| 28 | Wahkiakum County | Low | 1.80 / yr | $14K | |
| 29 | Grant County | Low | 0.54 / yr | $11K | |
| 30 | Benton County | Low | 0.48 / yr | $13K | |
| 31 | Asotin County | Low | 0.44 / yr | $6K | |
| 32 | Walla Walla County | Low | 1.04 / yr | $5K | |
| 33 | Columbia County | Low | 1.12 / yr | $4K | |
| 34 | San Juan County | Very Low | 0.33 / yr | $3K | |
| 35 | Garfield County | Very Low | 0.58 / yr | $3K | |
| 36 | Spokane County | Very Low | 0.54 / yr | $3K | |
| 37 | Franklin County | Very Low | 0.37 / yr | $2K | |
| 38 | Douglas County | Very Low | 0.85 / yr | $1K | |
| 39 | Adams County | Very Low | 0.36 / yr | $335 |
39 Washington counties with measurable landslide risk. See the national landslide ranking or all Washington counties by overall risk.
Frequently Asked Questions
Which Washington county has the highest landslide risk?
Snohomish County has the highest FEMA landslide risk score in Washington at 100.0 (Very High), with $25M in expected annual losses and about 4.12 events per year.
How many Washington counties face significant landslide risk?
39 Washington counties record measurable landslide risk in FEMA's National Risk Index; 8 of them are rated High or Very High.