Tsunami Risk by State & County

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 →

Tsunami Risk by State

#StateExpected Ann. LossAvg. ScoreRatingCounties Rated
1Washington$231M
18.3
Very Low 39 of 39
2California$192M
18.1
Very Low 58 of 58
3Oregon$143M
13.8
Very Low 36 of 36
4Hawaii$103M
71.1
High 5 of 5
5Alaska$50M
22.8
Low 30 of 30
6District of Columbia$0
0.0
Very Low 1 of 1
7Delaware$0
0.0
Very Low 3 of 3
8New Jersey$0
0.0
Very Low 21 of 21
9Connecticut$0
0.0
Very Low 9 of 9
10Arizona$0
0.0
Very Low 15 of 15
11Massachusetts$0
0.0
Very Low 14 of 14
12Florida$0
0.0
Very Low 67 of 67
13South Carolina$0
0.0
Very Low 46 of 46
14New Hampshire$0
0.0
Very Low 10 of 10
15New York$0
0.0
Very Low 62 of 62
16Pennsylvania$0
0.0
Very Low 67 of 67
17North Carolina$0
0.0
Very Low 100 of 100
18Louisiana$0
0.0
Very Low 64 of 64
19Alabama$0
0.0
Very Low 67 of 67
20Maryland$0
0.0
Very Low 24 of 24
21Wisconsin$0
0.0
Very Low 72 of 72
22New Mexico$0
0.0
Very Low 33 of 33
23Maine$0
0.0
Very Low 16 of 16
24Rhode Island$0
0.0
Very Low 5 of 5
25Oklahoma$0
0.0
Very Low 77 of 77
26Arkansas$0
0.0
Very Low 75 of 75
27Ohio$0
0.0
Very Low 88 of 88
28Illinois$0
0.0
Very Low 102 of 102
29Tennessee$0
0.0
Very Low 95 of 95
30Mississippi$0
0.0
Very Low 82 of 82
31Missouri$0
0.0
Very Low 115 of 115
32Michigan$0
0.0
Very Low 83 of 83
33West Virginia$0
0.0
Very Low 55 of 55
34Texas$0
0.0
Very Low 254 of 254
35Nevada$0
0.0
Very Low 17 of 17
36Indiana$0
0.0
Very Low 92 of 92
37Kentucky$0
0.0
Very Low 120 of 120
38Minnesota$0
0.0
Very Low 87 of 87
39Colorado$0
0.0
Very Low 64 of 64
40Iowa$0
0.0
Very Low 99 of 99
41Georgia$0
0.0
Very Low 159 of 159
42Idaho$0
0.0
Very Low 44 of 44
43Wyoming$0
0.0
Very Low 23 of 23
44Vermont$0
0.0
Very Low 14 of 14
45Utah$0
0.0
Very Low 29 of 29
46Virginia$0
0.0
Very Low 133 of 133
47Montana$0
0.0
Very Low 56 of 56
48Kansas$0
0.0
Very Low 105 of 105
49South Dakota$0
0.0
Very Low 66 of 66
50Nebraska$0
0.0
Very Low 93 of 93
51North Dakota$0
0.0
Very Low 53 of 53

States ranked by total expected annual tsunami losses; the average score is the mean over all counties, counting unrated counties as zero.

Riskiest Counties for Tsunami

#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.