Is radon high in New Mexico?

New Mexico's population-weighted predicted basement average is 2.1 pCi/L, about 1.2× the US average of 1.8. 0 of its 32 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 27 are in the 2-4 "consider fixing" range and 5 are below 2. 0% of New Mexico ZIP codes are predicted at 4 or higher.

Which New Mexico county has the highest radon?

Taos County has the highest predicted basement average in New Mexico at 2.9 pCi/L (EPA Zone 1). The lowest is Doña Ana County at 1.9 pCi/L. These are modeled area averages; individual homes in any county can test far higher.

How many EPA Zone 1 counties are in New Mexico?

7 of New Mexico's 33 counties (21%) are EPA Zone 1 (highest potential), 26 are Zone 2 and 0 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.

Should I test for radon in New Mexico?

Yes - with some urgency. New Mexico's predicted average is in the moderate range, and 79.1% of its ZIP codes are predicted at 2 pCi/L or higher. A short-term charcoal kit or a continuous digital monitor will tell you your actual level within days.

Radon levels in New Mexico: Moderate

The model predicts a population-weighted basement average of 2.1 pCi/L across New Mexico's 32 counties - about 1.2× the US average of 1.8 pCi/L. Above-ground floors average 1.5 pCi/L.

Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

7 / 33

EPA Zone 1 counties (21%)

26 / 0

Zone 2 / Zone 3 counties

counties predicted ≥ 4 pCi/L

of ZIP codes predicted ≥ 4 pCi/L

New Mexico counties by predicted radon

Sorted highest to lowest predicted basement average. 33 counties.

County	Predicted basement	Upstairs	Grade	EPA zone	ZIPs
Taos County	2.9 pCi/L	2.4	Moderate	EPA Zone 1	12
Rio Arriba County	2.8 pCi/L	1.9	Moderate	EPA Zone 1	18
Mora County	2.8 pCi/L	1.8	Moderate	EPA Zone 1	6
Colfax County	2.6 pCi/L	2.0	Moderate	EPA Zone 1	7
McKinley County	2.5 pCi/L	1.8	Moderate	EPA Zone 2	9
San Miguel County	2.5 pCi/L	1.7	Moderate	EPA Zone 1	12
Otero County	2.5 pCi/L	1.4	Moderate	EPA Zone 2	11
San Juan County	2.5 pCi/L	1.7	Moderate	EPA Zone 2	11
Santa Fe County	2.5 pCi/L	2.3	Moderate	EPA Zone 1	12
Union County	2.4 pCi/L	1.4	Moderate	EPA Zone 2	7
Sierra County	2.4 pCi/L	1.4	Moderate	EPA Zone 2	7
Lincoln County	2.4 pCi/L	1.6	Moderate	EPA Zone 2	13
Cibola County	2.4 pCi/L	1.6	Moderate	EPA Zone 2	8
Torrance County	2.2 pCi/L	1.6	Moderate	EPA Zone 2	5
Catron County	2.2 pCi/L	1.5	Moderate	EPA Zone 2	6
Grant County	2.2 pCi/L	1.5	Moderate	EPA Zone 2	8
Quay County	2.1 pCi/L	1.2	Moderate	EPA Zone 2	7
Roosevelt County	2.1 pCi/L	1.0	Moderate	EPA Zone 2	7
Chaves County	2.1 pCi/L	1.3	Moderate	EPA Zone 2	7
Harding County	2.1 pCi/L	1.2	Moderate	EPA Zone 2	4
Socorro County	2.1 pCi/L	1.4	Moderate	EPA Zone 2	8
Eddy County	2.1 pCi/L	1.2	Moderate	EPA Zone 2	3
Guadalupe County	2.1 pCi/L	1.1	Moderate	EPA Zone 2	3
Valencia County	2.0 pCi/L	1.4	Moderate	EPA Zone 2	4
Sandoval County	2.0 pCi/L	1.3	Moderate	EPA Zone 2	18
Bernalillo County	2.0 pCi/L	1.4	Moderate	EPA Zone 1	20
Curry County	2.0 pCi/L	0.7	Moderate	EPA Zone 2	4
Lea County	2.0 pCi/L	1.0	Low	EPA Zone 2	8
De Baca County	2.0 pCi/L	1.0	Low	EPA Zone 2	3
Hidalgo County	2.0 pCi/L	1.1	Low	EPA Zone 2	2
Luna County	2.0 pCi/L	1.1	Low	EPA Zone 2	1
Doña Ana County	1.9 pCi/L	1.1	Low	EPA Zone 2	17
Los Alamos County	n/a	-	zone only	EPA Zone 2	0

New Mexico radon questions

Is radon high in New Mexico?: New Mexico's population-weighted predicted basement average is 2.1 pCi/L, about 1.2× the US average of 1.8. 0 of its 32 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 27 are in the 2-4 "consider fixing" range and 5 are below 2. 0% of New Mexico ZIP codes are predicted at 4 or higher.
Which New Mexico county has the highest radon?: Taos County has the highest predicted basement average in New Mexico at 2.9 pCi/L (EPA Zone 1). The lowest is Doña Ana County at 1.9 pCi/L. These are modeled area averages; individual homes in any county can test far higher.
How many EPA Zone 1 counties are in New Mexico?: 7 of New Mexico's 33 counties (21%) are EPA Zone 1 (highest potential), 26 are Zone 2 and 0 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
Should I test for radon in New Mexico?: Yes - with some urgency. New Mexico's predicted average is in the moderate range, and 79.1% of its ZIP codes are predicted at 2 pCi/L or higher. A short-term charcoal kit or a continuous digital monitor will tell you your actual level within days.

New Mexico radon program

Many states offer free or discounted test kits and keep lists of certified mitigators. Find the New Mexico radon office through the EPA state radon contacts page. Then read how to test and what mitigation costs.