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Radon Levels in Doña Ana County, New Mexico

EPA puts Doña Ana County in Zone 2, its middle radon zone, and most reported tests there come back low, though 12.5% of 104 (2008 to 2017, laboratory totals) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    12.5%

    16.0 pts below NM

    Doña Ana
    12.5%
    New Mexico
    28.5%

    104 tests, 2008 to 2017

  • Median result

    1.3pCi/L

    Below action level

    Doña Ana
    1.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    104

    5th of 8 by tests

    Doña Ana
    104
    Santa Fe
    1,819

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in New Mexico

    7 of 8

    Lowest quarter

    Doña Ana
    12.5%
    Taos
    77.1%

    By share, of 8 with 30+ tests

Read a result for Doña Ana County

Starts at Doña Ana County's median, 1.3 pCi/L

1.3pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 1.3 pCi/L

Below 2 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Doña Ana County's median reported result, 2008 to 2017.

Interpret this reading

The data

Doña Ana County, At a glance

Doña Ana County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Doña Ana County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: High across 43% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Doña Ana County, 2008 to 2017, laboratory

Reported results by concentration band, Doña Ana County, 2008 to 2017, laboratory
Under 2 pCi/L: 66%2 to 4 pCi/L: 21%4 pCi/L and above: 13%

Of 104 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Doña Ana County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L6966.3%
2 to 4 pCi/L2221.2%
4 pCi/L and above1312.5%
What these figures count

These are the 104 tests reported to CDC for Doña Ana County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Doña Ana County, Compared

Doña Ana County radon figures, compared

Calculated by Radon411

Doña Ana County reports fewer high tests than New Mexico overall. 12.5% of its 104 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 16.0 points below the 28.5% pooled from 29 New Mexico counties.

Ordered from highest share down, it comes 7th of 8 New Mexico counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Doña Ana County sits 23.2 points below it.

El Paso County, TX, the one bordering county with a figure for the same period, reported 0.0%. Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 12.5% share point the same way here.

Half the tests came in under 1.3 pCi/L and half over it; the single highest reached 18.4 pCi/L. The rest split 66.3% under 2 pCi/L and 21.2% from 2 to 4 (New Mexico: 41.3% and 30.2%).

CDC's ten-year totals for Doña Ana County went from 116 tests (2005 to 2014) to 104 (2008 to 2017), the share going from 14.7% to 12.5%.

Doña Ana County against New Mexico, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Doña Ana County
Doña Ana County10412.5%1.3 pCi/LThis county
New Mexico, pooled29 counties, pooled3,72128.5%Not pooled+16.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+23.2 points
Taos Countyhighest in the state8377.1%8.5 pCi/L+64.6 points
Curry Countylowest in the state1353.7%0.6 pCi/L−8.8 points
Luna County, NMborders it540.0%2.5 pCi/L+27.5 points
Otero County, NMborders it2313.0%1.2 pCi/L+0.5 points
Sierra County, NMborders it20.0%2.2 pCi/L−12.5 points
El Paso County, TXborders it570.0%0.7 pCi/L−12.5 points
Where Doña Ana County's reported results fell, 2008 to 2017, laboratory, beside New Mexico and the United States
ResultDoña Ana County testsDoña Ana County shareNew Mexico shareU.S. shareAgainst New Mexico
Under 2 pCi/L6966.3%41.3%39.6%+25.0 points
2 to 4 pCi/L2221.2%30.2%24.7%−9.0 points
4 pCi/L and above1312.5%28.5%35.7%−16.0 points
Doña Ana County ranked among the 8 New Mexico counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Taos County1 of 88377.1%8.5 pCi/L
Los Alamos County2 of 87838.5%3.0 pCi/L
San Juan County3 of 85633.9%2.4 pCi/L
Santa Fe County4 of 81,81931.2%2.7 pCi/L
Bernalillo County5 of 81,05224.3%2.1 pCi/L
Sandoval County6 of 814021.4%1.5 pCi/L
Doña Ana County7 of 810412.5%1.3 pCi/L
Curry County8 of 81353.7%0.6 pCi/L
Doña Ana County ten-year laboratory totals, against New Mexico's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestNew Mexico, pooledChange from the row before
2008 to 201710412.5%1.3 pCi/L18.4 pCi/L28.5%−2.4 points
2007 to 201611414.9%1.3 pCi/L18.4 pCi/L30.0%−1.4 points
2006 to 201510416.3%1.4 pCi/L44.9 pCi/L30.3%+1.6 points
2005 to 201411614.7%1.3 pCi/L58.9 pCi/L29.7%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Doña Ana County, Geology

The ground under Doña Ana County

Predicted

No class of ground holds half of Doña Ana County on USGS's geologic map: 43.2% of its land is high radon potential, 17.4% moderate and 39.4% low. The map puts 43.2% of Doña Ana County in the area it calls Rocky Mountains (southern extension) and 39.4% in Basin and Range Southern Mexican Highland, with one smaller area beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Doña Ana County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Rocky Mountains (southern extension)Sandstone, siltstone, shale, volcanic sediments, and valley-fill alluvium.High1243.2%
Basin and Range Southern Mexican HighlandVolcanic, plutonic, and lesser sandstone, shale, limestone; Quaternary velley-fill alluvium.Low839.4%
Datil-Mogollon Volcanic FieldSilicic to intermediate volcanic and volcaniclastic rocks, basin-fill gravel, sand, silt.Moderate1117.4%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Doña Ana County beside the ground around it

Doña Ana County has more high-potential ground than New Mexico as a whole: 43.2% of its land against 19.2%. Of the 4 counties that border it, 2 have more high-potential ground, El Paso County, TX the most at 93.8%.

Share of land by USGS radon potential: Doña Ana County, the 4 counties bordering it and New Mexico
AreaEPA zoneLow potentialModerate potentialHigh potential
Doña Ana CountyZone 239.4%17.4%43.2%
Sierra CountyZone 21.1%48.6%50.4%
Luna CountyZone 288.3%11.7%None
Otero CountyZone 2None60.5%39.5%
El Paso County, TXZone 36.2%None93.8%
New Mexico33 counties, pooled by land areaVaries7.4%73.4%19.2%

The map rates the ground, not the air in any home.

Local help

Doña Ana County, Local resources

Radon testing and mitigation in Doña Ana County

What New Mexico's program says
Phone
(505) 476-8600
Email
radon.questions@env.nm.gov
Licensing of radon professionals
There is not currently a certification program within the state.

What it means

Doña Ana County, Questions

Questions about radon in Doña Ana County

Are radon levels high in Doña Ana County?

Over the 2008 to 2017 laboratory totals, 12.5% of the radon tests reported to CDC for Doña Ana County, New Mexico were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.3 pCi/L. Of 8 New Mexico counties with 30 or more tests for the same period, 6 reported a higher share; pooled, the state comes to 28.5%.

Which counties border Doña Ana County?

Doña Ana County borders 4 counties: Sierra County, NM, Luna County, NM, Otero County, NM and El Paso County, TX.

Products

Doña Ana County, Products

Testing a home in Doña Ana County

In Doña Ana County, 12.5% of 104 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 28.5% pooled across New Mexico. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Doña Ana County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Doña Ana County homes, compared

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Doña Ana County, Bordering counties

Counties bordering Doña Ana County

Calculated by Radon411

Doña Ana County, Cities and towns

Cities and towns in Doña Ana County

The Census Bureau estimates 229,091 residents in Doña Ana County for July 1, 2025, 9,032 more than in 2020 (+4.1%). That works out to 60 people per square mile of land. Las Cruces alone is home to 116,978 of them, 51.1% of the total. Together its 5 incorporated places hold 64.4% of those residents; the other 35.6% live outside any of them. Reported testing is thin here: 104 tests over 2008 to 2017, or 0.5 for every 1,000 residents (2025 estimate), where New Mexico as a whole comes to 1.8.

From Las Cruces to Hatch, CDC publishes no figure by town: each reads Doña Ana County's.

The cities and towns in Doña Ana County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Las Cruces116,978+4.7%51.1%
Sunland Park18,268+8.8%8.0%
Anthony8,900+2.1%3.9%
Mesilla1,818+0.8%0.8%
Hatch1,584+2.3%0.7%

5 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Doña Ana County, Homes

Homes in Doña Ana County

Of Doña Ana County's 91,402 homes, 60% are detached houses, against 65% across New Mexico; 19% are mobile homes. Half of its homes were built before 1990, close to New Mexico's 1984: 11% date from before 1960 and 32% from 2000 or later. 65% of occupied homes are lived in by their owner (New Mexico: 69%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Doña Ana County, New Mexico, 2019 to 2023
HomesDoña Ana CountyNew Mexico
Housing units91,402949,524
Detached houses60%65%
In buildings of 5 or more10%10%
Mobile homes19%16%
Built before 196011%17%
Built since 200032%24%
Middle year built19901984
Owner-occupied65%69%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.