Riskiest Counties for Volcanic Activity

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 →

County Rankings

#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.

Volcanic Activity Risk by State