Riskiest Counties for Tsunami

Ranked by FEMA National Risk Index tsunami hazard score · code TSUN

Tsunami risk reflects series of ocean waves triggered by undersea earthquakes or landslides. FEMA's National Risk Index scores each county's tsunami hazard from its expected annual loss, annualized event frequency, and exposed population. Grays Harbor County, Washington currently leads the nation with a tsunami score of 100.0 and $121M in expected annual loss. California, Oregon, Washington account for much of the highest-rated tsunami risk in this dataset.

Read the full tsunami risk guide — how FEMA scores it and how to prepare →

County Rankings

#CountyStateTsunami ScoreRatingAnn. Freq.Ann. Loss
1Grays Harbor CountyWA
100.0
Very High 0.13 / yr$121M
2Del Norte CountyCA
98.5
Very High 0.23 / yr$114M
3Clatsop CountyOR
96.9
Very High 0.15 / yr$100M
4Pacific CountyWA
95.4
Very High 0.13 / yr$84M
5Humboldt CountyCA
93.8
High 0.23 / yr$33M
6Honolulu CountyHI
92.3
High 0.66 / yr$48M
7Maui CountyHI
90.8
High 0.66 / yr$31M
8Curry CountyOR
89.2
High 0.15 / yr$17M
9Aleutians West Census AreaAK
87.7
Medium 0.35 / yr$20M
10Hawaii CountyHI
86.2
Medium 0.66 / yr$15M
11Coos CountyOR
84.6
Medium 0.15 / yr$11M
12Clallam CountyWA
83.1
Medium 0.13 / yr$10M
13Kenai Peninsula BoroughAK
81.5
Medium 0.30 / yr$10M
14Kodiak Island BoroughAK
80.0
Medium 0.31 / yr$11M
15Tillamook CountyOR
78.5
Medium 0.15 / yr$9M
16Lincoln CountyOR
76.9
Medium 0.15 / yr$6M
17Kauai CountyHI
75.4
Medium 0.66 / yr$9M
18Santa Cruz CountyCA
73.8
Medium 0.39 / yr$8M
19San Francisco CountyCA
72.3
Medium 0.34 / yr$6M
20San Mateo CountyCA
70.8
Medium 0.34 / yr$7M
21Marin CountyCA
69.2
Medium 0.34 / yr$6M
22King CountyWA
67.7
Low 0.06 / yr$6M
23Aleutians East BoroughAK
66.2
Low 0.35 / yr$2M
24Los Angeles CountyCA
64.6
Low 0.39 / yr$3M
25San Luis Obispo CountyCA
63.1
Low 0.38 / yr$3M

Showing the top 25 seeded counties for tsunami risk.

Tsunami Risk by State

CaliforniaHawaiiWashingtonOregonAlaska