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Radon zones in New Mexico

The EPA assigns every county in New Mexico to one of three radon potential zones. 7 are in Zone 1, the highest category, home to about 45% of the state's residents.

33
Counties
7
Zone 1 counties
Predicted average above 4 pCi/L
26
Zone 2 counties
Predicted average 2-4 pCi/L
0
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across New Mexico

Every county in New Mexico, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 7Zone 2 · 26Zone 3 · 0

Hover a county · click to open it

County by county

All 33 New Mexico counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Bernalillo County1672k5.6%12.0%19.8
Colfax County112k8.1%13.2%14.0
Mora County14,1236.6%10.6% -
Rio Arriba County140k7.0%14.2%16.5
San Miguel County127k6.5%11.6%20.5
Santa Fe County1156k6.3%10.0%15.6
Taos County134k7.0%11.2%14.4
Catron County23,82511.3%14.8% -
Chaves County264k7.4%15.1%30.4
Cibola County227k8.4%19.4%16.6
Curry County247k6.7%14.4%34.9
De Baca County21,6578.8%14.1% -
Doña Ana County2225k6.0%12.1%21.2
Eddy County260k5.9%13.3%26.9
Grant County227k8.5%12.7%23.0
Guadalupe County24,2926.4%13.9% -
Harding County262410.8%14.3% -
Hidalgo County23,9658.3%14.7% -
Lea County272k6.3%14.8%28.0
Lincoln County220k8.5%12.6%20.0
Los Alamos County219k3.7%7.1% -
Luna County225k9.5%16.9%30.4
McKinley County269k11.5%26.8%9.1
Otero County269k7.2%14.9%28.8
Quay County28,5109.9%15.8%26.7
Roosevelt County219k6.6%13.4%31.5
San Juan County2121k9.2%20.1%21.5
Sandoval County2156k5.6%11.2%19.4
Sierra County211k11.9%15.8%33.4
Socorro County216k8.1%15.5%19.5
Torrance County216k9.6%17.0%22.1
Union County23,9648.4%15.3% -
Valencia County279k6.6%13.5%25.6

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in New Mexico

These 7 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere