Washington coastal flooding risk
Grays Harbor County has the highest coastal flooding risk in Washington, scoring 99 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Grays Harbor County | 99 | Very High |
| 2 | Skagit County | 91.4 | Relatively High |
| 3 | Kitsap County | 79.4 | Relatively Moderate |
| 4 | Snohomish County | 77.6 | Relatively Moderate |
| 5 | Mason County | 75.2 | Relatively Moderate |
| 6 | Pacific County | 75 | Relatively Moderate |
| 7 | Island County | 73.4 | Relatively Moderate |
| 8 | Pierce County | 71.4 | Relatively Moderate |
| 9 | King County | 71 | Relatively Moderate |
| 10 | Wahkiakum County | 70.4 | Relatively Moderate |
| 11 | Jefferson County | 64.4 | Relatively Moderate |
| 12 | Whatcom County | 63.2 | Relatively Moderate |
| 13 | Thurston County | 58.6 | Relatively Low |
| 14 | San Juan County | 58.4 | Relatively Low |
| 15 | Clallam County | 55.8 | Relatively Low |
| 16 | Cowlitz County | 51 | Relatively Low |
| 17 | Clark County | 29.2 | Very Low |
| 18 | Skamania County | 17.4 | Very Low |
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.
Coastal Flooding risk nationally:
Other hazard risks in Washington:
Frequently asked questions
What is the highest coastal flooding risk county in Washington?
Grays Harbor County, WA has the highest coastal flooding risk in Washington, with a FEMA National Risk Index score of 99 out of 100 (rated "Very High").
How many counties in Washington are rated Very High for coastal flooding risk?
1 of 18 scored Washington counties are rated "Very High" for coastal flooding risk by FEMA's National Risk Index.
What causes coastal flooding risk in Washington?
Coastal flooding scores cover storm surge, wave action, and tidal flooding along the Gulf, Atlantic, and Pacific coasts, and Great Lakes shoreline. Inland flooding is scored separately. Counties with "Not Applicable" ratings have no significant coastal exposure. Coastal flood events are reported at zone level in NOAA Storm Events and are not included in county-level counts.