New Mexico Radon Levels
7Zone 1 (High)
26Zone 2 (Moderate)
0Zone 3 (Low)
21% of counties in New Mexico 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 |
|---|---|---|
| Bernalillo County | Zone 1 | Highest Potential |
| Catron County | Zone 2 | Moderate Potential |
| Chaves County | Zone 2 | Moderate Potential |
| Cibola County | Zone 2 | Moderate Potential |
| Colfax County | Zone 1 | Highest Potential |
| Curry County | Zone 2 | Moderate Potential |
| De Baca County | Zone 2 | Moderate Potential |
| Dona Ana County | Zone 2 | Moderate Potential |
| Eddy County | Zone 2 | Moderate Potential |
| Grant County | Zone 2 | Moderate Potential |
| Guadalupe County | Zone 2 | Moderate Potential |
| Harding County | Zone 2 | Moderate Potential |
| Hidalgo County | Zone 2 | Moderate Potential |
| Lea County | Zone 2 | Moderate Potential |
| Lincoln County | Zone 2 | Moderate Potential |
| Los Alamos County | Zone 2 | Moderate Potential |
| Luna County | Zone 2 | Moderate Potential |
| McKinley County | Zone 2 | Moderate Potential |
| Mora County | Zone 1 | Highest Potential |
| Otero County | Zone 2 | Moderate Potential |
| Quay County | Zone 2 | Moderate Potential |
| Rio Arriba County | Zone 1 | Highest Potential |
| Roosevelt County | Zone 2 | Moderate Potential |
| Sandoval County | Zone 2 | Moderate Potential |
| San Juan County | Zone 2 | Moderate Potential |
| San Miguel County | Zone 1 | Highest Potential |
| Santa Fe County | Zone 1 | Highest Potential |
| Sierra County | Zone 2 | Moderate Potential |
| Socorro County | Zone 2 | Moderate Potential |
| Taos County | Zone 1 | Highest Potential |
| Torrance County | Zone 2 | Moderate Potential |
| Union County | Zone 2 | Moderate Potential |
| Valencia County | Zone 2 | Moderate Potential |