Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Prowers County, Colorado
EPA puts Prowers County in Zone 1, its highest radon zone, and only 19 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
28.5%
21.0 pts below CO
- Prowers
- 28.5%
- Colorado
- 49.5%
165 tests, 2005 to 2014
Median result
2.9pCi/L
Below action level
- Prowers
- 2.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2005 to 2014
Tests reported
165
32nd of 47 by tests
- Prowers
- 165
- Jefferson
- 8,109
Reported to CDC before any fix, 2005 to 2014
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
47 of 47
Lowest quarter
- Prowers
- 28.5%
- Pueblo
- 69.9%
By share, of 47 with 30+ tests
Read a result for Prowers County
Starts at Prowers County's median, 2.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.9 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. Prowers County's median reported result, 2005 to 2014.
The data
Prowers County, At a glance
Prowers County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Prowers County in
USGS geologic potential: High across 98% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Prowers County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 20.0% |
| 2015 | 20.0% |
| 2016 | 44.4% |
| 2017 | 7.7% |
| 2018 | 18.2% |
| 2019 | 75.0% |
| 2020 | 38.5% |
| 2021 | 29.4% |
| 2022 | 33.3% |
| 2023 | 84.2% |
2023: 84.2%. Across these years the share ran from 7.7% to 84.2%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 19 tests were reported to CDC for Prowers County over 2023, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Prowers County, Compared
Prowers County radon figures, compared
Calculated by Radon411Prowers County's 165 reported tests over the 2005 to 2014 laboratory totals had a middle value of 2.9 pCi/L and a maximum of 17.3 pCi/L, and 28.5% reached 4 pCi/L. Colorado as a whole (63 Colorado counties, pooled) comes to 49.5%: 21.0 points higher than here.
The newest figure, in 2023, counts only 19 tests (84.2% at or above 4 pCi/L), too few to compare, so this reading uses the 165-test figure.
Among its state's counties it ranks 47th of 47 Colorado counties with 30 or more tests for the same period. Statewide for the same period, Pueblo County reported the highest share (69.9%) and Alamosa County the lowest (31.0%).
Below the action level, 43 tests (26.1%) came in under 2 pCi/L, against 29.2% statewide, and 75 tests (45.5%) fell between 2 and 4, against 21.4% statewide. The busiest year on file was 2023, with 19 tests reported; the quietest, 2015, had 5.
EPA's 1993 zone map puts Prowers County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 98% of the county's land high radon potential.
Next door, the shares run from 61.8% in Baca County to 62.5% in Bent County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Prowers County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Prowers 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 Prowers 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
45.0%
94 of 209 tests
Median result
3.5 pCi/L
Highest result
239.0 pCi/L
Tests behind these figures
209 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.
Prowers County, Geology
The ground under Prowers County
PredictedMost of the ground under Prowers County is one class on USGS's geologic map: 98.1% of its land is high radon potential, with 1.9% moderate. The map puts 65.9% of Prowers County in the area it calls High Plains and 32.2% in Ogallala Formation, with one smaller area beside them. USGS gives both a radon index of 12, 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 | 65.9% |
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 32.2% |
| Arkansas River Lowlands | Dune sands and alluvium. | Moderate | 10 | 1.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Prowers County beside the ground around it
Prowers County has more high-potential ground than Colorado as a whole: 98.1% of its land against 74.8%. Of the 6 counties that border it, 4 have more high-potential ground, Greeley County, KS the most at 100%.
The map rates the ground, not the air in any home.
Local help
Prowers County, Local resources
Radon testing and mitigation in Prowers 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
Prowers County, Questions
Questions about radon in Prowers County
Are radon levels high in Prowers County?
In 2023, 84.2% of the radon tests reported to CDC for Prowers County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.9 pCi/L. Of 47 Colorado counties with 30 or more tests for the same period, 46 reported a higher share; pooled, the state comes to 49.5%.
Which counties border Prowers County?
Prowers County borders 6 counties: Hamilton County, KS, Kiowa County, CO, Bent County, CO, Greeley County, KS, Stanton County, KS and Baca County, CO.
Products
Prowers County, Products
Testing a home in Prowers County
In Prowers County, 28.5% of 165 tests reported to CDC over the 2005 to 2014 laboratory totals reached 4 pCi/L, against 49.5% pooled across Colorado. In Zone 1 the year-round level in Prowers 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
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Prowers County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Prowers County
Explore
Prowers County, Bordering counties
Counties bordering Prowers County
Calculated by Radon411- Radon levels in Bent County, COEPA zone 1
62.5%at or above 4 pCi/L
Median 4.9 pCi/L · 32 tests · 34.0 points above Prowers County
- Radon levels in Baca County, COEPA zone 1
61.8%at or above 4 pCi/L
Median 4.5 pCi/L · 34 tests · 33.3 points above Prowers County
- Radon levels in Kiowa County, COEPA zone 1
61.5%at or above 4 pCi/L
Median 4.8 pCi/L · 13 tests · 33.0 points above Prowers County
- Radon levels in Hamilton County, KSEPA zone 1
No CDC figure for 2005 to 2014; its page reads it against its own neighbours.
- Radon levels in Greeley County, KSEPA zone 1
No CDC figure for 2005 to 2014; its page reads it against its own neighbours.
- Radon levels in Stanton County, KSEPA zone 1
No CDC figure for 2005 to 2014; its page reads it against its own neighbours.
Prowers County, Cities and towns
Cities and towns in Prowers County
About 11,884 people live in Prowers County by the Census Bureau's estimate for July 1, 2025, 128 fewer than in 2020 (−1.1%). Spread over its land, that is 7.3 people to the square mile. Lamar alone is home to 7,588 of them, 63.9% of the total. Together its 5 incorporated places hold 78.9% of those residents; the other 21.1% live outside any of them. CDC's 165 reported tests for 2005 to 2014 work out to 13.9 per 1,000 residents (2025 estimate), close to Colorado's 11.4.
From Lamar to Hartman, CDC publishes no figure by town: each reads Prowers County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lamar | 7,588 | −1.4% | 63.9% |
| Holly | 836 | −1.3% | 7.0% |
| Granada | 463 | +3.6% | 3.9% |
| Wiley | 433 | −1.4% | 3.6% |
| Hartman | 55 | −1.8% | 0.5% |
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).
Prowers County, Homes
Homes in Prowers County
Of Prowers County's 5,466 homes, 70% are detached houses, against 62% across Colorado; 15% are mobile homes. The homes are older than Colorado's as a whole: half were built before 1974 (1987 for Colorado), and 38% 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 | Prowers County | Colorado |
|---|---|---|
| Housing units | 5,466 | 2,545,124 |
| Detached houses | 70% | 62% |
| In buildings of 5 or more | 8% | 22% |
| Mobile homes | 15% | 4% |
| Built before 1960 | 38% | 16% |
| Built since 2000 | 11% | 31% |
| Middle year built | 1974 | 1987 |
| Owner-occupied | 70% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.