Nevada Radon Levels
9Zone 1 (High)
7Zone 2 (Moderate)
1Zone 3 (Low)
53% of counties in Nevada are classified as EPA Zone 1 (highest radon potential), meaning predicted average indoor radon levels exceed 4 pCi/L — the EPA action level. The EPA recommends that all homes be tested for radon, regardless of zone classification.
| County | EPA Zone | Risk Level |
|---|---|---|
| Churchill County | Zone 2 | Moderate Potential |
| Clark County | Zone 3 | Lowest Potential |
| Douglas County | Zone 1 | Highest Potential |
| Elko County | Zone 2 | Moderate Potential |
| Esmeralda County | Zone 2 | Moderate Potential |
| Eureka County | Zone 1 | Highest Potential |
| Humboldt County | Zone 2 | Moderate Potential |
| Lander County | Zone 1 | Highest Potential |
| Lincoln County | Zone 1 | Highest Potential |
| Lyon County | Zone 1 | Highest Potential |
| Mineral County | Zone 1 | Highest Potential |
| Nye County | Zone 2 | Moderate Potential |
| Pershing County | Zone 1 | Highest Potential |
| Storey County | Zone 2 | Moderate Potential |
| Washoe County | Zone 2 | Moderate Potential |
| White Pine County | Zone 1 | Highest Potential |
| Carson City | Zone 1 | Highest Potential |