Radon in Nevada
About 1 in 4 homes tested in Nevada were at or above the EPA action level of 4 pCi/L.
- Below 2 pCi/L: 53%
- 2 to 4 pCi/L: 25%
- 4 pCi/L or more: 22%
The EPA puts 9 of Nevada's 17 counties in Zone 1, its highest radon category, 7 in Zone 2 and 1 in Zone 3.
Every county in Nevada
Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.
| County | Homes tested | At or above 4 | Median | EPA zone |
|---|---|---|---|---|
| Pershing County | 18 tests | – | – | 1 |
| Carson City | 41% | 3.3 pCi/L | 1 | |
| Elko County | 40% | 3.1 pCi/L | 2 | |
| White Pine County | 39% | 3.1 pCi/L | 1 | |
| Douglas County | 37% | 3.1 pCi/L | 1 | |
| Mineral County | 4 tests | – | – | 1 |
| Humboldt County | 32% | 2.3 pCi/L | 2 | |
| Lyon County | 30% | 2.6 pCi/L | 1 | |
| Lander County | 15 tests | – | – | 1 |
| Lincoln County | 6 tests | – | – | 1 |
| Washoe County | 22% | 1.9 pCi/L | 2 | |
| Storey County | 18% | 2.3 pCi/L | 2 | |
| Churchill County | 12% | 2.1 pCi/L | 2 | |
| Nye County | 11% | 1.3 pCi/L | 2 | |
| Clark County | 8% | 0.9 pCi/L | 3 | |
| Eureka County | 1 tests | – | – | 1 |
| Esmeralda County | No data | – | – | 2 |
"–" means fewer than 20 tests or no lab data, too few for a reliable figure.
Sources
- EPA Map of Radon Zones (public domain).
- CDC Environmental Public Health Tracking Network, radon tests from labs, 2008–2017. Pre-mitigation tests only.
Last updated October 2026. How we calculate these numbers.