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Radon Levels in Las Animas County, Colorado

EPA puts Las Animas County in Zone 1, its highest radon zone, and 19.4% of its 93 reported radon tests (2023) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    19.4%

    19.5 pts below CO

    Las Animas
    19.4%
    Colorado
    38.9%

    93 tests, 2023

  • Median result

    1.1pCi/L

    Below action level

    Las Animas
    1.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    93

    29th of 38 by tests

    Las Animas
    93
    Jefferson
    3,068

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Colorado

    36 of 38

    Lowest quarter

    Las Animas
    19.4%
    Park
    57.5%

    By share, of 38 with 30+ tests

Read a result for Las Animas County

Starts at Las Animas County's median, 1.1 pCi/L

1.1pCi/L

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

EPA’s reading of 1.1 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. Las Animas County's median reported result, 2023.

Interpret this reading

The data

Las Animas County, At a glance

Las Animas County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Las Animas County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 83% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Las Animas County, 2023

Share of reported tests at or above 4 pCi/L, by year, Las Animas County
Share of reported tests at or above 4 pCi/L, by year, Las Animas County
YearShare of reported tests at or above 4 pCi/L
201455.6%
201572.2%
201636.4%
201758.3%
201813.7%
201932.3%
202050.9%
202133.9%
202257.7%
202319.4%

2023: 19.4%. Across these years the share ran from 13.7% to 72.2%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 93 tests reported to CDC for Las Animas County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Las Animas County, Compared

Las Animas County radon figures, compared

Calculated by Radon411

Las Animas County's 93 reported tests in 2023 had a middle value of 1.1 pCi/L and a maximum of 38.4 pCi/L, and 19.4% reached 4 pCi/L. Colorado as a whole (61 Colorado counties, pooled) comes to 38.9%: 19.5 points higher than here.

Among its state's counties it ranks 36th of 38 Colorado counties with 30 or more tests for the same period. Statewide for the same period, Park County reported the highest share (57.5%) and Bent County the lowest (3.7%).

Below the action level, 60 tests (64.5%) came in under 2 pCi/L, against 39.2% statewide, and 15 tests (16.1%) fell between 2 and 4, against 22.0% statewide. The busiest year on file was 2018, with 117 tests reported; the quietest, 2015, had 18.

EPA's 1993 zone map puts Las Animas County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 83% of the county's land high radon potential.

Next door, the shares run from 3.7% in Bent County to 44.4% in Pueblo County, with Bent County below Las Animas County. Over 5 years of annual figures the share rose 5.7 points, from 13.7% in 2018 to 19.4% in 2023; its peak was 50.9% in 2020.

CDC also counts 7 tests taken after mitigation in Las Animas County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Las Animas County against Colorado2018 to 2023, years with 30 or more tests: Las Animas County 13.7% to 19.4%, the state's pooled share 38.9% in 2023.
Las Animas CountyColorado, pooled
Share of reported tests at or above 4 pCi/L by year, Las Animas County against Colorado: data table
YearTestsLas Animas County, at or above 4 pCi/LColorado, pooled
201811713.7%44.2%
20193132.3%44.1%
20205750.9%41.9%
202111233.9%47.3%
20239319.4%38.9%
Las Animas County against Colorado, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Las Animas County
Las Animas County9319.4%1.1 pCi/LThis county
Colorado, pooled61 counties, pooled21,80238.9%Not pooled+19.5 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+14.0 points
Park Countyhighest in the state10657.5%4.6 pCi/L+38.1 points
Mesa Countylowest in the state56718.9%2.2 pCi/L−0.5 points
Pueblo County, COborders it34244.4%3.5 pCi/L+25.0 points
Otero County, COborders it633.3%2.8 pCi/L+13.9 points
Huerfano County, COborders it5328.3%1.3 pCi/L+8.9 points
Bent County, COborders it1083.7%0.1 pCi/L−15.7 points
Costilla County, COborders it20.0%0.5 pCi/L−19.4 points
Where Las Animas County's reported results fell, 2023, beside Colorado and the United States
ResultLas Animas County testsLas Animas County shareColorado shareU.S. shareAgainst Colorado
Under 2 pCi/L6064.5%39.2%41.4%+25.3 points
2 to 4 pCi/L1516.1%22.0%25.2%−5.9 points
4 pCi/L and above1819.4%38.9%33.4%−19.5 points
Las Animas County ranked among the 38 Colorado counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Douglas County28 of 381,63535.8%2.4 pCi/L
Denver County29 of 382,27735.4%2.8 pCi/L
Gunnison County30 of 3814734.7%2.5 pCi/L
El Paso County31 of 381,84434.4%2.5 pCi/L
Boulder County32 of 381,96334.2%2.5 pCi/L
Montezuma County33 of 387233.3%3.0 pCi/L
Huerfano County34 of 385328.3%1.3 pCi/L
Gilpin County35 of 3812926.4%1.1 pCi/L
Las Animas County36 of 389319.4%1.1 pCi/L
Mesa County37 of 3856718.9%2.2 pCi/L
Bent County38 of 381083.7%0.1 pCi/L
Las Animas County radon tests by year, against Colorado's pooled share
YearTestsAt or above 4 pCi/LMedianHighestColorado, pooledChange from the row before
20239319.4%1.1 pCi/L38.4 pCi/L38.9%−38.3 points
20222657.7%4.2 pCi/L42.9 pCi/L38.6%+23.8 points
202111233.9%0.1 pCi/L120.0 pCi/L47.3%−17.0 points
20205750.9%4.0 pCi/L13.6 pCi/L41.9%+18.6 points
20193132.3%3.2 pCi/L26.6 pCi/L44.1%+18.6 points
201811713.7%0.7 pCi/L11.0 pCi/L44.2%−44.6 points
20172458.3%4.7 pCi/L30.4 pCi/L41.0%+21.9 points
20162236.4%2.9 pCi/L9.1 pCi/L38.5%−35.8 points
20151872.2%7.5 pCi/L16.6 pCi/L47.2%+16.6 points
20141855.6%4.4 pCi/L11.9 pCi/L46.5%First on file

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

Las Animas County, State data

Colorado's own radon test data

Measured

What Colorado's own agencies publish about radon tests in Las Animas County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What Colorado CDPHE reports for Las Animas County

Radon data (county results): radon test results received from radon testing labs, primarily short-term household tests taken by the homeowner. Period: 2005-2025.

Share over 4 pCi/L

41.1%

389 of 946 tests

Median result

3.1 pCi/L

Highest result

59.5 pCi/L

Tests behind these figures

946 tests

  • CDPHE says these data do not give actual radon levels in homes that have not been tested.
  • When possible, only tests conducted before a mitigation system was installed are used.
  • Some counties have very small numbers of test results, and their summaries may be less representative.
  • These figures describe tests reported to Colorado CDPHE in this area. They count a different set of tests than CDC's figures and are not a reading of any one home.

Measured: Colorado CDPHE data, 2005-2025.

Las Animas County, Geology

The ground under Las Animas County

Predicted

Most of the ground under Las Animas County is one class on USGS's geologic map: 82.6% of its land is high radon potential, with 17.4% moderate. The map puts 77.1% of Las Animas County in the area it calls High Plains and 17.4% in Southern Great Plains, with 2 smaller areas beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Las Animas County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
High PlainsQuaternary deposits and Cretaceous marine shales that locally have a high radiometric signature.High1277.1%
Southern Great PlainsCretaceous sedimentary rocks including sandstone and shale.Moderate1017.4%
Ogallala FormationTertiary sandstone, in part covered by windblown eolian sand and loess deposits.High123.0%
Rocky MountainsPrecambrian granites, gneiss, amphibolite, variable uranium content, abundant shear zones.Sedimentary rocks shed from the granitic highlands.High152.4%

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

Las Animas County beside the ground around it

On high-potential ground Las Animas County is close to Colorado as a whole: 82.6% of its land against 74.8%. Of the 8 counties that border it, 5 have more high-potential ground, Otero County the most at 100%.

Share of land by USGS radon potential: Las Animas County, the 8 counties bordering it and Colorado
AreaEPA zoneLow potentialModerate potentialHigh potential
Las Animas CountyZone 1None17.4%82.6%
Otero CountyZone 1NoneNone100%
Pueblo CountyZone 1NoneNone100%
Huerfano CountyZone 1None12.3%87.7%
Bent CountyZone 1NoneNone100%
Colfax County, NMZone 1None95.2%4.8%
Union County, NMZone 2None67.0%33.0%
Baca CountyZone 1None2.2%97.8%
Costilla CountyZone 2None61.4%38.6%
Colorado64 counties, pooled by land areaVariesNone25.2%74.8%

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

Local help

Las Animas County, Local resources

Radon testing and mitigation in Las Animas County

What Colorado's program says
Licensing of radon professionals
Listed contractors are certified by the National Radon Proficiency Program or the National Radon Safety Board, and must be licensed by the Colorado Department of Regulatory Agencies.
Disclosure when a home is sold or rented
As of August 7, 2023, landlords in Colorado are required to disclose radon information when a tenant signs a lease agreement.

What it means

Las Animas County, Questions

Questions about radon in Las Animas County

Are radon levels high in Las Animas County?

In 2023, 19.4% of the radon tests reported to CDC for Las Animas County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.1 pCi/L. Of 38 Colorado counties with 30 or more tests for the same period, 35 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Las Animas County?

Las Animas County borders 8 counties: Otero County, CO, Pueblo County, CO, Huerfano County, CO, Bent County, CO, Colfax County, NM, Union County, NM, Baca County, CO and Costilla County, CO.

Products

Las Animas County, Products

Testing a home in Las Animas County

In Las Animas County, 19.4% of 93 tests reported to CDC in 2023 reached 4 pCi/L, against 38.9% pooled across Colorado. In Zone 1 the year-round level in Las Animas County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Las Animas County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Las Animas County

Explore

Las Animas County, Bordering counties

Counties bordering Las Animas County

Calculated by Radon411

Las Animas County, Cities and towns

Cities and towns in Las Animas County

About 14,391 people live in Las Animas County by the Census Bureau's estimate for July 1, 2025, 100 fewer than in 2020 (−0.7%). Spread over its land, that is 3.0 people to the square mile. Trinidad alone is home to 8,091 of them, 56.2% of the total. Together its 6 incorporated places hold 61.5% of those residents; the other 38.5% live outside any of them. Testing is reported here more often than across the state: CDC's 93 reported tests for 2023 come to 6.5 for every 1,000 residents (2025 estimate), against 3.6 for Colorado.

From Trinidad to Branson, CDC publishes no figure by town: each reads Las Animas County's.

The cities and towns in Las Animas County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Trinidad8,091−3.0%56.2%
Aguilar445−1.8%3.1%
Cokedale123−1.6%0.9%
Starkville66+1.5%0.5%
Kim63+1.6%0.4%
Branson57+3.6%0.4%

6 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).

Las Animas County, Homes

Homes in Las Animas County

Las Animas County is a place of houses on their own lots: 77% of its 8,134 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1971 (1987 for Colorado), and 44% date from before 1960. 70% of occupied homes are lived in by their owner (Colorado: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Las Animas County, Colorado, 2019 to 2023
HomesLas Animas CountyColorado
Housing units8,1342,545,124
Detached houses77%62%
In buildings of 5 or more5%22%
Mobile homes10%4%
Built before 196044%16%
Built since 200017%31%
Middle year built19711987
Owner-occupied70%66%

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