Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Pueblo County, Colorado
EPA puts Pueblo County in Zone 1, its highest radon zone, and high results are common there: 44.4% of the 342 radon tests reported to CDC (2023) came back 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
Share at 4+ pCi/L
44.4%
5.5 pts above CO
- Pueblo
- 44.4%
- Colorado
- 38.9%
342 tests, 2023
Median result
3.5pCi/L
Below action level
- Pueblo
- 3.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
342
12th of 38 by tests
- Pueblo
- 342
- Jefferson
- 3,068
Reported to CDC before any fix, 2023
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Colorado
14 of 38
Middle half
- Pueblo
- 44.4%
- Park
- 57.5%
By share, of 38 with 30+ tests
Read a result for Pueblo County
Starts at Pueblo County's median, 3.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.5 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Pueblo County's median reported result, 2023.
The data
Pueblo County, At a glance
Pueblo County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Pueblo County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Pueblo County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 61.6% |
| 2015 | 72.3% |
| 2016 | 45.7% |
| 2017 | 39.8% |
| 2018 | 54.6% |
| 2019 | 31.0% |
| 2020 | 48.1% |
| 2021 | 49.9% |
| 2022 | 63.4% |
| 2023 | 44.4% |
2023: 44.4%. Across these years the share ran from 31.0% to 72.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 342 tests reported to CDC for Pueblo 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).
Pueblo County, Compared
Pueblo County radon figures, compared
Calculated by Radon411In Pueblo County, about 4 in 10 reported tests in 2023 (152 of 342) were at or above EPA's action level. Against the national pool of 33.4%, the gap is 11.0 points higher. Across 61 Colorado counties pooled together, 38.9% of tests reached that level, so Pueblo County runs 5.5 points above its state.
Of 5 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 19.4% (Las Animas County) to 50.0% (Fremont County). By share, Pueblo County is 14th of 38 Colorado counties with 30 or more tests for the same period.
Year by year, 2014 opened at 61.6% and 2023 closed at 44.4% (down 17.2 points), with 2015 the high at 72.3%. Half the tests came in under 3.5 pCi/L and half over it; the single highest reached 77.2 pCi/L. Below the action level, 101 tests (29.5%) came in under 2 pCi/L, against 39.2% statewide, and 89 tests (26.0%) fell between 2 and 4, against 22.0% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 44.4% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 56 tests taken after mitigation in Pueblo County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2019, with 915 tests reported; the quietest, 2017, had 98.
Pueblo CountyColorado, pooled
| Year | Tests | Pueblo County, at or above 4 pCi/L | Colorado, pooled |
|---|---|---|---|
| 2014 | 159 | 61.6% | 46.5% |
| 2015 | 159 | 72.3% | 47.2% |
| 2016 | 127 | 45.7% | 38.5% |
| 2017 | 98 | 39.8% | 41.0% |
| 2018 | 350 | 54.6% | 44.2% |
| 2019 | 915 | 31.0% | 44.1% |
| 2020 | 374 | 48.1% | 41.9% |
| 2021 | 463 | 49.9% | 47.3% |
| 2022 | 320 | 63.4% | 38.6% |
| 2023 | 342 | 44.4% | 38.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Pueblo County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Pueblo 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 Pueblo 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
63.2%
3,959 of 6,260 tests
Median result
5.7 pCi/L
Highest result
279.0 pCi/L
Tests behind these figures
6,260 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.
Pueblo County, Geology
The ground under Pueblo County
PredictedUSGS's geologic map puts all of Pueblo County's mapped land in one class: high radon potential. The map puts 90.6% of Pueblo County in the area it calls High Plains and 9.4% in Rocky Mountains. USGS gives the first a radon index of 12 and the second 15, both in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| High Plains | Quaternary deposits and Cretaceous marine shales that locally have a high radiometric signature. | High | 12 | 90.6% |
| Rocky Mountains | Precambrian granites, gneiss, amphibolite, variable uranium content, abundant shear zones.Sedimentary rocks shed from the granitic highlands. | High | 15 | 9.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Pueblo County beside the ground around it
Pueblo County has more high-potential ground than Colorado as a whole: 100% of its land against 74.8%. Of the 8 counties that border it, none has as large a share of high-potential ground; Crowley County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Pueblo County, Local resources
Radon testing and mitigation in Pueblo County
- Colorado's radon programColorado Department of Public Health and EnvironmentColorado's radon program licenses or certifies radon professionals, offers free or discounted test kits and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Colorado.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Order a discounted radon test kit
- Compare kits
- Professionals in Colorado25 professionals are listed in Colorado.
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
Pueblo County, Questions
Questions about radon in Pueblo County
Are radon levels high in Pueblo County?
In 2023, 44.4% of the radon tests reported to CDC for Pueblo County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 38 Colorado counties with 30 or more tests for the same period, 13 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Pueblo County?
Pueblo County borders 8 counties: Huerfano County, Custer County, Otero County, Crowley County, Las Animas County, El Paso County, Fremont County and Lincoln County.
Products
Pueblo County, Products
Testing a home in Pueblo County
In Pueblo County, 44.4% of 342 tests reported to CDC in 2023 reached 4 pCi/L, against 38.9% pooled across Colorado. In Zone 1 the year-round level in Pueblo 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
Monitor
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Pueblo County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Pueblo County
Explore
Pueblo County, Bordering counties
Counties bordering Pueblo County
Calculated by Radon411- Radon levels in Lincoln CountyEPA zone 1
57.1%at or above 4 pCi/L
Median 4.0 pCi/L · 7 tests · 12.7 points above Pueblo County
- Radon levels in Fremont CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 66 tests · 5.6 points above Pueblo County
- Radon levels in Custer CountyEPA zone 1
45.7%at or above 4 pCi/L
Median 3.5 pCi/L · 35 tests · 1.3 points above Pueblo County
- Radon levels in El Paso CountyEPA zone 1
34.4%at or above 4 pCi/L
Median 2.5 pCi/L · 1,844 tests · 10.0 points below Pueblo County
- Radon levels in Otero CountyEPA zone 1
33.3%at or above 4 pCi/L
Median 2.8 pCi/L · 6 tests · 11.1 points below Pueblo County
- Radon levels in Huerfano CountyEPA zone 1
28.3%at or above 4 pCi/L
Median 1.3 pCi/L · 53 tests · 16.1 points below Pueblo County
- Radon levels in Las Animas CountyEPA zone 1
19.4%at or above 4 pCi/L
Median 1.1 pCi/L · 93 tests · 25.0 points below Pueblo County
- Radon levels in Crowley CountyEPA zone 1
No CDC figure for 2023; its page reads it against its own neighbours.
Pueblo County, Cities and towns
Cities and towns in Pueblo County
The Census Bureau estimates 169,277 residents in Pueblo County for July 1, 2025, 943 more than in 2020 (+0.6%). That works out to 71 people per square mile of land. Pueblo alone is home to 110,404 of them, 65.2% of the total. Together its 3 incorporated places hold 65.5% of those residents; the other 34.5% live outside any of them. Reported testing is thin here: 342 tests over 2023, or 2.0 for every 1,000 residents (2025 estimate), where Colorado as a whole comes to 3.6.
From Pueblo to Rye, CDC publishes no figure by town: each reads Pueblo County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Pueblo | 110,404 | −1.3% | 65.2% |
| Boone | 305 | Level | 0.2% |
| Rye | 201 | −3.4% | 0.1% |
3 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).
Pueblo County, Homes
Homes in Pueblo County
Pueblo County is a place of houses on their own lots: 76% of its 73,031 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1974 (1987 for Colorado), and 35% date from before 1960. 68% 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 | Pueblo County | Colorado |
|---|---|---|
| Housing units | 73,031 | 2,545,124 |
| Detached houses | 76% | 62% |
| In buildings of 5 or more | 10% | 22% |
| Mobile homes | 5% | 4% |
| Built before 1960 | 35% | 16% |
| Built since 2000 | 21% | 31% |
| Middle year built | 1974 | 1987 |
| Owner-occupied | 68% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.