Volcanic Activity Risk by State & County

Ranked by FEMA National Risk Index volcanic activity hazard score · code VLCN

Volcanic Activity risk reflects eruptions producing ashfall, lava, and pyroclastic hazards. FEMA's National Risk Index scores each county's volcanic activity hazard from its expected annual loss, annualized event frequency, and exposed population. Hawaii County, Hawaii currently leads the nation with a volcanic activity score of 100.0 and $26M in expected annual loss. Washington, Oregon, California account for much of the highest-rated volcanic activity risk in this dataset.

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

Volcanic Activity Risk by State

#StateExpected Ann. LossAvg. ScoreRatingCounties Rated
1Hawaii$29M
43.3
Medium 5 of 5
2Washington$23M
55.2
Medium 39 of 39
3Alaska$4M
56.7
Medium 30 of 30
4California$2M
51.4
Medium 58 of 58
5Oregon$2M
65.6
High 36 of 36
6Nevada$4K
35.8
Low 17 of 17
7Arizona$3K
29.3
Low 15 of 15
8Colorado$3K
21.2
Low 64 of 64
9Utah$1K
34.6
Low 29 of 29
10Idaho$1K
34.7
Low 44 of 44
11New Mexico$107
16.9
Very Low 33 of 33
12Wyoming$106
12.2
Very Low 23 of 23
13Montana$2
2.0
Very Low 56 of 56
14District of Columbia$0
0.0
Very Low 1 of 1
15Delaware$0
0.0
Very Low 3 of 3
16New Jersey$0
0.0
Very Low 21 of 21
17Connecticut$0
0.0
Very Low 9 of 9
18Massachusetts$0
0.0
Very Low 14 of 14
19Florida$0
0.0
Very Low 67 of 67
20South Carolina$0
0.0
Very Low 46 of 46
21New Hampshire$0
0.0
Very Low 10 of 10
22New York$0
0.0
Very Low 62 of 62
23Pennsylvania$0
0.0
Very Low 67 of 67
24North Carolina$0
0.0
Very Low 100 of 100
25Louisiana$0
0.0
Very Low 64 of 64
26Alabama$0
0.0
Very Low 67 of 67
27Maryland$0
0.0
Very Low 24 of 24
28Wisconsin$0
0.0
Very Low 72 of 72
29Maine$0
0.0
Very Low 16 of 16
30Rhode Island$0
0.0
Very Low 5 of 5
31Oklahoma$0
0.0
Very Low 77 of 77
32Arkansas$0
0.0
Very Low 75 of 75
33Ohio$0
0.0
Very Low 88 of 88
34Illinois$0
0.0
Very Low 102 of 102
35Tennessee$0
0.0
Very Low 95 of 95
36Mississippi$0
0.0
Very Low 82 of 82
37Missouri$0
0.0
Very Low 115 of 115
38Michigan$0
0.0
Very Low 83 of 83
39West Virginia$0
0.0
Very Low 55 of 55
40Texas$0
0.0
Very Low 254 of 254
41Indiana$0
0.0
Very Low 92 of 92
42Kentucky$0
0.0
Very Low 120 of 120
43Minnesota$0
0.0
Very Low 87 of 87
44Iowa$0
0.0
Very Low 99 of 99
45Georgia$0
0.0
Very Low 159 of 159
46Vermont$0
0.0
Very Low 14 of 14
47Virginia$0
0.0
Very Low 133 of 133
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 volcanic activity losses; the average score is the mean over all counties, counting unrated counties as zero.

Riskiest Counties for Volcanic Activity

#CountyStateVolcanic Activity ScoreRatingAnn. Freq.Ann. Loss
1Hawaii CountyHI
100.0
Very High 0.02 / yr$26M
2Cowlitz CountyWA
99.7
High 0.01 / yr$8M
3Pierce CountyWA
99.3
High 0.01 / yr$7M
4Skagit CountyWA
99.0
High 0.00 / yr$3M
5Aleutians West Census AreaAK
98.7
High 0.16 / yr$3M
6Maui CountyHI
98.4
High 0.00 / yr$2M
7Siskiyou CountyCA
98.0
High 0.00 / yr$2M
8Aleutians East BoroughAK
97.7
High 0.08 / yr$895K
9King CountyWA
97.4
High 0.01 / yr$2M
10Skamania CountyWA
97.1
High 0.01 / yr$2M
11Lake CountyCA
96.7
Medium 0.00 / yr$484K
12Snohomish CountyWA
96.4
Medium 0.01 / yr$675K
13Deschutes CountyOR
96.1
Medium 0.00 / yr$554K
14Clackamas CountyOR
95.8
Medium 0.01 / yr$495K
15Hood River CountyOR
95.4
Medium 0.01 / yr$491K
16Lewis CountyWA
95.1
Medium 0.01 / yr$287K
17Shasta CountyCA
94.8
Medium 0.00 / yr$245K
18Lane CountyOR
94.5
Medium 0.01 / yr$197K
19Thurston CountyWA
94.1
Medium 0.01 / yr$195K
20Sitka City and BoroughAK
93.8
Medium 0.00 / yr$141K
21Multnomah CountyOR
93.5
Medium 0.01 / yr$159K
22Whatcom CountyWA
93.2
Medium 0.00 / yr$128K
23Marion CountyOR
92.8
Medium 0.01 / yr$84K
24Tehama CountyCA
92.5
Low 0.00 / yr$58K
25Klickitat CountyWA
92.2
Low 0.01 / yr$31K

Showing the top 25 seeded counties for volcanic activity risk.