New Mexico: 33 counties covered
Of 33 rated New Mexico counties, 7 are in EPA's highest radon-potential zone (Zone 1) — but every county page links to testing guidance regardless of zone, because a county rating is a county-wide average, not a reading for any one house.
- Bernalillo County
- Doña Ana County
- Santa Fe County
- Sandoval County
- San Juan County
- Valencia County
- Lea County
- Otero County
- McKinley County
- Chaves County
- Eddy County
- Curry County
- Rio Arriba County
- Taos County
- Grant County
- Cibola County
- San Miguel County
- Luna County
- Lincoln County
- Los Alamos County
- Roosevelt County
- Torrance County
- Socorro County
- Colfax County
- Sierra County
- Quay County
- Guadalupe County
- Mora County
- Hidalgo County
- Union County
- Catron County
- De Baca County
- Harding County