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 Graham County, Kansas
EPA puts Graham County in Zone 1, its highest radon zone, and only 3 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
71.4%
Phillips County
- Phillips
- 71.4%
1 of 6 neighbours have 30+ tests, 2019
Nearest county
71.4%
Phillips County, 41 miles
- Phillips
- 71.4%
- Kansas
- 33.7%
Share at 4+ pCi/L, 35 tests, 2019
Ground above low
100.0%
Level with Kansas
- Graham
- 100.0%
- Kansas
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
12
Too few for a share
- Graham
- 12
- Needed
- 30
2021
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 Graham 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
Graham County, At a glance
Graham County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Graham 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 Graham County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 88.9% |
| 2017 | 62.5% |
| 2018 | 100.0% |
| 2020 | 100.0% |
| 2021 | 75.0% |
| 2022 | 100.0% |
2022: 100.0%. Across these years the share ran from 62.5% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 3 tests were reported to CDC for Graham County over 2022, 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: 2022. Measured data period: 2016 to 2022 (every CDC figure on file).
Graham County, Compared
Graham County radon figures, compared
Calculated by Radon411CDC's largest figure for Graham County rests on 12 tests in 2021, 9 of them at or above 4 pCi/L, so each test moves its share by 8.3 points and no rank or comparison is drawn from it. Results reached as high as 6.8 pCi/L, with a middle value of 6.3 pCi/L.
Phillips County, the one bordering county with a figure in 2019, reported 71.4% of its tests at or above 4 pCi/L. Farther out, Ellis County (43 miles away) at 41.6%, Thomas County (63 miles away) at 45.5% and Scott County (81 miles away) at 61.5% have figures too. Pooled across 102 Kansas counties, 33.7% of reported tests reached that level; across every county in the country with a figure, 29.0%.
Statewide for the same period, Jewell County reported the highest share (71.9%) and Reno County the lowest (20.8%). EPA's 1993 map puts Graham 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.
Graham County, Geology
The ground under Graham County
PredictedUSGS's geologic map puts all of Graham County's mapped land in one class: high radon potential. The map puts 69.0% of Graham County in the area it calls Ogallala Formation and 31.0% in Smoky Hills. 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 |
|---|---|---|---|---|
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 69.0% |
| Smoky Hills | Cretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits. | High | 12 | 31.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Graham County beside the ground around it
Graham County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Gove County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Graham County, Local resources
Radon testing and mitigation in Graham County
- Kansas Radon ProgramKansas Radon Program answers questions about testing, mitigation and the rules in Kansas.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kansas178 professionals are listed in Kansas.
What Kansas's program says
- Phone
- (800) 693-5343
What it means
Graham County, Questions
Questions about radon in Graham County
Are radon levels high in Graham County?
In 2022, 100.0% of the radon tests reported to CDC for Graham County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.7 pCi/L. Phillips County, the one bordering county with a figure in 2019, reported 71.4% of its tests at or above 4 pCi/L.
Which counties border Graham County?
Graham County borders 6 counties: Rooks County, Sheridan County, Norton County, Trego County, Phillips County and Gove County.
Products
Graham County, Products
Testing a home in Graham County
No CDC figure names Graham County; the nearest county with one, Phillips County (41 miles away), reported 71.4% of its tests at or above 4 pCi/L in 2019, the only reading nearby until a test of this home. In Zone 1 the year-round level in Graham 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
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
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
Graham County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Graham County
Explore
Graham County, Bordering counties
Counties bordering Graham County
Calculated by Radon411- Radon levels in Norton CountyEPA zone 1
90.0%at or above 4 pCi/L
Median 7.9 pCi/L · 10 tests
- Radon levels in Rooks CountyEPA zone 1
77.8%at or above 4 pCi/L
Median 6.0 pCi/L · 9 tests
- Radon levels in Gove CountyEPA zone 1
75.0%at or above 4 pCi/L
Median 9.1 pCi/L · 8 tests
- Radon levels in Sheridan CountyEPA zone 1
71.4%at or above 4 pCi/L
Median 4.5 pCi/L · 14 tests
- Radon levels in Phillips CountyEPA zone 1
71.4%at or above 4 pCi/L
Median 6.0 pCi/L · 35 tests
- Radon levels in Trego CountyEPA zone 1
66.7%at or above 4 pCi/L
Median 6.2 pCi/L · 9 tests
Graham County, Cities and towns
Cities and towns in Graham County
About 2,371 people live in Graham County by the Census Bureau's estimate for July 1, 2025, 35 fewer than in 2020 (−1.5%). Spread over its land, that is 2.6 people to the square mile. Hill City alone is home to 1,376 of them, 58.0% of the total. Together its 3 incorporated places hold 69.0% of those residents; the other 31.0% live outside any of them. Reported testing is thin here: 12 tests over 2021, or 5.1 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 23.5.
From Hill City to Morland, CDC publishes no figure by town: each reads Graham County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hill City | 1,376 | −1.4% | 58.0% |
| Bogue | 146 | −2.0% | 6.2% |
| Morland | 115 | −1.7% | 4.9% |
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).
Graham County, Homes
Homes in Graham County
Graham County is a place of houses on their own lots: 88% of its 1,428 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1957 (1975 for Kansas), and 55% date from before 1960. Owners live in 81% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.
| Homes | Graham County | Kansas |
|---|---|---|
| Housing units | 1,428 | 1,285,221 |
| Detached houses | 88% | 72% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 5% | 4% |
| Built before 1960 | 55% | 33% |
| Built since 2000 | 2% | 20% |
| Middle year built | 1957 | 1975 |
| Owner-occupied | 81% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.