Nevada volcanic activity risk
Churchill County has the highest volcanic activity risk in Nevada, scoring 86.6 out of 100 — rated "Relatively Low" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Churchill County | 86.6 | Relatively Low |
| 2 | Washoe County | 78.5 | Very Low |
| 3 | Lyon County | 50.8 | Very Low |
| 4 | Carson City | 49.8 | Very Low |
| 5 | Nye County | 41.4 | Very Low |
| 6 | Mineral County | 41 | Very Low |
| 7 | Douglas County | 40.7 | Very Low |
| 8 | Clark County | 36.5 | Very Low |
| 9 | Humboldt County | 33.6 | Very Low |
| 10 | Pershing County | 31.3 | Very Low |
| 11 | Lander County | 30.6 | Very Low |
| 12 | Esmeralda County | 27.4 | Very Low |
| 13 | Storey County | 23.5 | Very Low |
| 14 | Eureka County | 16.6 | Very Low |
| 15 | Lincoln County | 10.7 | Very Low |
| 16 | Elko County | 10.4 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Volcanic Activity risk nationally:
Other hazard risks in Nevada:
Frequently asked questions
What is the highest volcanic activity risk county in Nevada?
Churchill County, NV has the highest volcanic activity risk in Nevada, with a FEMA National Risk Index score of 86.6 out of 100 (rated "Relatively Low").
What causes volcanic activity risk in Nevada?
Volcanic activity risk reflects expected losses from lava flows, tephra fall, lahars (volcanic mudflows), and volcanic gases. The highest-risk counties are in Washington (Mt. Rainier), Oregon (Mt. Hood), and Hawaii (Kilauea, Mauna Loa). Alaska's Aleutian chain contains many active volcanoes affecting nearby communities and trans-Pacific air traffic. Volcanic ashfall events are reported at forecast-zone level in NOAA Storm Events and are not included in county-level counts.