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 Lincoln County, Colorado
EPA puts Lincoln County in Zone 1, its highest radon zone, and only 7 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
Highest bordering
71.4%
Kit Carson County
- Kit Carson
- 71.4%
- El Paso
- 42.1%
6 of 9 neighbours have 30+ tests, 2008 to 2017
Nearest county
42.9%
Elbert County, 39 miles
- Elbert
- 42.9%
- Colorado
- 47.0%
Share at 4+ pCi/L, 438 tests, 2008 to 2017
Ground above low
100.0%
Level with Colorado
- Lincoln
- 100.0%
- Colorado
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
17
Too few for a share
- Lincoln
- 17
- Needed
- 30
2005 to 2014, laboratory
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Read a result for Lincoln County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Lincoln County, At a glance
Lincoln County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Lincoln 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 Lincoln County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 100.0% |
| 2015 | 50.0% |
| 2016 | 50.0% |
| 2017 | 60.0% |
| 2018 | 70.0% |
| 2019 | 58.3% |
| 2020 | 72.7% |
| 2021 | 100.0% |
| 2022 | 50.0% |
| 2023 | 57.1% |
2023: 57.1%. Across these years the share ran from 50.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 7 tests were reported to CDC for Lincoln 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).
Lincoln County, Compared
Lincoln County radon figures, compared
Calculated by Radon411CDC's largest figure for Lincoln County rests on 17 tests over the 2005 to 2014 laboratory totals, 7 of them at or above 4 pCi/L, so each test moves its share by 5.9 points and no rank or comparison is drawn from it. Results reached as high as 9.7 pCi/L, with a middle value of 3.2 pCi/L.
Of the counties bordering it, 6 have a figure over the 2008 to 2017 laboratory totals: Kit Carson County reported the largest share at or above 4 pCi/L, 71.4%, and El Paso County the smallest, 42.1%, with Pueblo County at 70.1%, Washington County at 62.8% and Arapahoe County at 45.3% between. Farther out, Bent County (75 miles away) at 59.4%, Adams County (75 miles away) at 41.4% and Otero County (76 miles away) at 57.9% have figures too. Pooled across 63 Colorado counties, 47.0% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Kit Carson County reported the highest share (71.4%) and Alamosa County the lowest (26.6%). EPA's 1993 map puts Lincoln County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Lincoln County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Lincoln 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 Lincoln 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
34%
34 of 100 tests
Median result
2.0 pCi/L
Highest result
25.2 pCi/L
Tests behind these figures
100 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.
Lincoln County, Geology
The ground under Lincoln County
PredictedUSGS's geologic map puts all of Lincoln County's mapped land in one class: high radon potential. The map puts 75.8% of Lincoln County in the area it calls High Plains and 24.2% in Ogallala Formation. 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 | 75.8% |
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 24.2% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lincoln County beside the ground around it
Lincoln County has more high-potential ground than Colorado as a whole: 100% of its land against 74.8%. Of the 9 counties that border it, none has as large a share of high-potential ground; Arapahoe County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Lincoln County, Local resources
Radon testing and mitigation in Lincoln 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
Lincoln County, Questions
Questions about radon in Lincoln County
Are radon levels high in Lincoln County?
In 2023, 57.1% of the radon tests reported to CDC for Lincoln County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.0 pCi/L. Of the counties bordering it, 6 have a figure over the 2008 to 2017 laboratory totals: Kit Carson County reported the largest share at or above 4 pCi/L, 71.4%, and El Paso County the smallest, 42.1%, with Pueblo County at 70.1%, Washington County at 62.8% and Arapahoe County at 45.3% between.
Which counties border Lincoln County?
Lincoln County borders 9 counties: Elbert County, Cheyenne County, Kit Carson County, Crowley County, Kiowa County, Arapahoe County, El Paso County, Washington County and Pueblo County.
Products
Lincoln County, Products
Testing a home in Lincoln County
No CDC figure names Lincoln County; the nearest county with one, Elbert County (39 miles away), reported 42.9% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 1 the year-round level in Lincoln 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
Hello Radon C battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Lincoln County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Lincoln County
Explore
Lincoln County, Bordering counties
Counties bordering Lincoln County
Calculated by Radon411- Radon levels in Crowley CountyEPA zone 1
100.0%at or above 4 pCi/L
Median 4.8 pCi/L · 3 tests
- Radon levels in Kit Carson CountyEPA zone 1
71.4%at or above 4 pCi/L
Median 5.3 pCi/L · 42 tests
- Radon levels in Pueblo CountyEPA zone 1
70.1%at or above 4 pCi/L
Median 6.2 pCi/L · 3,524 tests
- Radon levels in Cheyenne CountyEPA zone 1
66.7%at or above 4 pCi/L
Median 4.9 pCi/L · 6 tests
- Radon levels in Kiowa CountyEPA zone 1
63.6%at or above 4 pCi/L
Median 5.8 pCi/L · 11 tests
- Radon levels in Washington CountyEPA zone 1
62.8%at or above 4 pCi/L
Median 4.6 pCi/L · 86 tests
- Radon levels in Arapahoe CountyEPA zone 1
45.3%at or above 4 pCi/L
Median 3.4 pCi/L · 9,988 tests
- Radon levels in Elbert CountyEPA zone 1
42.9%at or above 4 pCi/L
Median 3.2 pCi/L · 438 tests
- Radon levels in El Paso CountyEPA zone 1
42.1%at or above 4 pCi/L
Median 3.2 pCi/L · 8,520 tests
Lincoln County, Cities and towns
Cities and towns in Lincoln County
Lincoln County's population has barely moved since 2020: 5,645 residents on July 1, 2025 against 5,666 then, by the Census Bureau's estimates. Spread over its land, that is 2.2 people to the square mile. Its largest town, Limon, has 2,021 residents, 35.8% of the total. Together its 4 incorporated places hold 56.0% of those residents; the other 44.0% live outside any of them. Reported testing is thin here: 17 tests over 2005 to 2014, or 3.0 for every 1,000 residents (2025 estimate), where Colorado as a whole comes to 11.4.
From Limon to Genoa, CDC publishes no figure by town: each reads Lincoln County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Limon | 2,021 | −0.8% | 35.8% |
| Hugo | 781 | Level | 13.8% |
| Arriba | 203 | Level | 3.6% |
| Genoa | 156 | +1.3% | 2.8% |
4 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).
Lincoln County, Homes
Homes in Lincoln County
Lincoln County is a place of houses on their own lots: 78% of its 2,385 homes are detached single-family houses, against 62% across Colorado. The homes are older than Colorado's as a whole: half were built before 1969 (1987 for Colorado), and 43% date from before 1960. 71% 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 | Lincoln County | Colorado |
|---|---|---|
| Housing units | 2,385 | 2,545,124 |
| Detached houses | 78% | 62% |
| In buildings of 5 or more | 9% | 22% |
| Mobile homes | 9% | 4% |
| Built before 1960 | 43% | 16% |
| Built since 2000 | 13% | 31% |
| Middle year built | 1969 | 1987 |
| Owner-occupied | 71% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.