Volcanic Activity Risk in Utah
All Utah counties ranked by FEMA National Risk Index volcanic activity score
Volcanic Activity risk — eruptions producing ashfall, lava, and pyroclastic hazards — is rated for 23 of 29 Utah counties in FEMA's National Risk Index. Kane County carries the state's highest volcanic activity score at 76.2, with $251 in expected annual volcanic activity losses.
No Utah county reaches the High band for volcanic activity, and expected annual losses from volcanic activity total roughly $1K statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Volcanic Activity
| # | County | Volcanic Activity Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Kane County | Very Low | 0.00 / yr | $251 | |
| 2 | Garfield County | Very Low | 0.00 / yr | $188 | |
| 3 | Salt Lake County | Very Low | 0.00 / yr | $281 | |
| 4 | Iron County | Very Low | 0.00 / yr | $212 | |
| 5 | Millard County | Very Low | 0.00 / yr | $128 | |
| 6 | Utah County | Very Low | 0.00 / yr | $157 | |
| 7 | Washington County | Very Low | 0.00 / yr | $74 | |
| 8 | Sanpete County | Very Low | 0.00 / yr | $11 | |
| 9 | Davis County | Very Low | 0.00 / yr | $17 | |
| 10 | Sevier County | Very Low | 0.00 / yr | $10 | |
| 11 | Summit County | Very Low | 0.00 / yr | $10 | |
| 12 | Wasatch County | Very Low | 0.00 / yr | $8 | |
| 13 | Carbon County | Very Low | 0.00 / yr | $5 | |
| 14 | Emery County | Very Low | 0.00 / yr | $4 | |
| 15 | Beaver County | Very Low | 0.00 / yr | $3 | |
| 16 | Juab County | Very Low | 0.00 / yr | $3 | |
| 17 | Wayne County | Very Low | 0.00 / yr | $1 | |
| 18 | Duchesne County | Very Low | 0.00 / yr | $2 | |
| 19 | Piute County | Very Low | 0.00 / yr | $1 | |
| 20 | San Juan County | Very Low | 0.00 / yr | $0 | |
| 21 | Morgan County | Very Low | 0.00 / yr | $0 | |
| 22 | Tooele County | Very Low | 0.00 / yr | $0 | |
| 23 | Box Elder County | Very Low | 0.00 / yr | $0 |
23 Utah counties with measurable volcanic activity risk. See the national volcanic activity ranking or all Utah counties by overall risk.
Frequently Asked Questions
Which Utah county has the highest volcanic activity risk?
Kane County has the highest FEMA volcanic activity risk score in Utah at 76.2 (Very Low), with $251 in expected annual losses and about 0.00 events per year.
How many Utah counties face significant volcanic activity risk?
23 Utah counties record measurable volcanic activity risk in FEMA's National Risk Index; 0 of them are rated High or Very High.