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 Teller County, Colorado
EPA puts Teller County in Zone 1, its highest radon zone, and high results are common there: 56.8% of the 162 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
56.8%
17.9 pts above CO
- Teller
- 56.8%
- Colorado
- 38.9%
162 tests, 2023
Median result
4.9pCi/L
Action level reached
- Teller
- 4.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
162
21st of 38 by tests
- Teller
- 162
- 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
2 of 38
Top quarter
- Teller
- 56.8%
- Park
- 57.5%
By share, of 38 with 30+ tests
Read a result for Teller County
Starts at Teller County's median, 4.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.9 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. Teller County's median reported result, 2023.
The data
Teller County, At a glance
Teller County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Teller 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 Teller County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 69.4% |
| 2015 | 67.4% |
| 2016 | 36.7% |
| 2017 | 44.7% |
| 2018 | 61.4% |
| 2019 | 53.3% |
| 2020 | 46.4% |
| 2021 | 55.3% |
| 2022 | 37.2% |
| 2023 | 56.8% |
2023: 56.8%. Across these years the share ran from 36.7% to 69.4%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 162 tests reported to CDC for Teller 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).
Teller County, Compared
Teller County radon figures, compared
Calculated by Radon411More than half: 56.8% of the 162 radon tests reported to CDC for Teller County in 2023 read at least 4 pCi/L. That places it 2nd of 38 Colorado counties with 30 or more tests for the same period. That is 17.9 points above the 38.9% pooled from 61 Colorado counties.
The median result, 4.9 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 368.9 pCi/L. The rest split 19.8% under 2 pCi/L and 23.5% from 2 to 4 (Colorado: 39.2% and 22.0%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 56.8% share point the same way here.
1 of its 5 bordering counties with figures ran higher, led by Park County at 57.5%; El Paso County reported 34.4%. Statewide for the same period, Park County reported the highest share (57.5%) and Bent County the lowest (3.7%).
The busiest year on file was 2021, with 389 tests reported; the quietest, 2016, had 90.
Over 10 years of annual figures the share fell 12.6 points, from 69.4% in 2014 to 56.8% in 2023; its peak was 69.4% in 2014. Nationally, every county with a figure for the same period pools to 33.4%; Teller County sits 23.4 points above it. CDC also counts 29 tests taken after mitigation in Teller County for the same period: tests in homes where a fix was already in.
Teller CountyColorado, pooled
56.8% % of tests38.9% % of tests
| Year | Tests | Teller County, at or above 4 pCi/L | Colorado, pooled |
|---|---|---|---|
| 2014 | 111 | 69.4% | 46.5% |
| 2015 | 95 | 67.4% | 47.2% |
| 2016 | 90 | 36.7% | 38.5% |
| 2017 | 123 | 44.7% | 41.0% |
| 2018 | 277 | 61.4% | 44.2% |
| 2019 | 349 | 53.3% | 44.1% |
| 2020 | 306 | 46.4% | 41.9% |
| 2021 | 389 | 55.3% | 47.3% |
| 2022 | 347 | 37.2% | 38.6% |
| 2023 | 162 | 56.8% | 38.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Teller County, State data
Colorado's own radon test data
MeasuredWhat Colorado's own agencies publish about radon tests in Teller 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 Teller 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
54.9%
1,497 of 2,727 tests
Median result
4.7 pCi/L
Highest result
957.4 pCi/L
Tests behind these figures
2,727 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.
Teller County, Geology
The ground under Teller County
PredictedUSGS's geologic map puts all of Teller County's mapped land in one class: high radon potential. All of it lies in the area the map calls Rocky Mountains, to which USGS gives a radon index of 15, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Rocky Mountains | Precambrian granites, gneiss, amphibolite, variable uranium content, abundant shear zones.Sedimentary rocks shed from the granitic highlands. | High | 15 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Teller County beside the ground around it
Teller County has more high-potential ground than Colorado as a whole: 100% of its land against 74.8%. Of the 5 counties that border it, none has as large a share of high-potential ground; Douglas County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Teller County, Local resources
Radon testing and mitigation in Teller 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
Teller County, Questions
Questions about radon in Teller County
Are radon levels high in Teller County?
In 2023, 56.8% of the radon tests reported to CDC for Teller County, Colorado were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.9 pCi/L. Of 38 Colorado counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Teller County?
Teller County borders 5 counties: Douglas County, Park County, El Paso County, Jefferson County and Fremont County.
Products
Teller County, Products
Testing a home in Teller County
In Teller County, 56.8% of 162 tests reported to CDC in 2023 reached 4 pCi/L, against 38.9% pooled across Colorado. In Zone 1 the year-round level in Teller 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
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Teller County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Teller County
Explore
Teller County, Bordering counties
Counties bordering Teller County
Calculated by Radon411- Radon levels in Park CountyEPA zone 1
57.5%at or above 4 pCi/L
Median 4.6 pCi/L · 106 tests · 0.7 points above Teller County
- Radon levels in Fremont CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 66 tests · 6.8 points below Teller County
- Radon levels in Jefferson CountyEPA zone 1
41.8%at or above 4 pCi/L
Median 3.2 pCi/L · 3,068 tests · 15.0 points below Teller County
- Radon levels in Douglas CountyEPA zone 1
35.8%at or above 4 pCi/L
Median 2.4 pCi/L · 1,635 tests · 21.0 points below Teller 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 · 22.4 points below Teller County
Teller County, Cities and towns
Cities and towns in Teller County
Teller County's population has barely moved since 2020: 24,756 residents on July 1, 2025 against 24,746 then, by the Census Bureau's estimates. That works out to 44 people per square mile of land. Its largest town, Woodland Park, has 8,014 residents, 32.4% of the total. Testing is reported here more often than across the state: CDC's 162 reported tests for 2023 come to 6.5 for every 1,000 residents (2025 estimate), against 3.6 for Colorado.
From Woodland Park to Victor, CDC publishes no figure by town: each reads Teller County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Woodland Park | 8,014 | +1.2% | 32.4% |
| Cripple Creek | 1,120 | −2.9% | 4.5% |
| Green Mountain Fallsextends beyond Teller County | 601 | −7.1% | Counted whole |
| Victor | 361 | −6.2% | 1.5% |
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). A place that extends beyond Teller County is counted whole, so it has no share.
Teller County, Homes
Homes in Teller County
Teller County is a place of houses on their own lots: 86% of its 13,516 homes are detached single-family houses, against 62% across Colorado. Half of its homes were built before 1989, close to Colorado's 1987: 9% date from before 1960 and 25% from 2000 or later. Owners live in 82% of the occupied homes (Colorado: 66%), so for most households a test and a fix are their own to order.
| Homes | Teller County | Colorado |
|---|---|---|
| Housing units | 13,516 | 2,545,124 |
| Detached houses | 86% | 62% |
| In buildings of 5 or more | 5% | 22% |
| Mobile homes | 5% | 4% |
| Built before 1960 | 9% | 16% |
| Built since 2000 | 25% | 31% |
| Middle year built | 1989 | 1987 |
| Owner-occupied | 82% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.