Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Harper County, Kansas
EPA puts Harper County in Zone 2, its middle radon zone, and only 6 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
32.8%
Sumner County
- Sumner
- 32.8%
1 of 5 neighbours have 30+ tests, 2019
Nearest county
32.8%
Sumner County, 33 miles
- Sumner
- 32.8%
- Kansas
- 33.7%
Share at 4+ pCi/L, 58 tests, 2019
Ground above low
99.5%
0.5 pts below Kansas
- Harper
- 99.5%
- Kansas
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
15
Too few for a share
- Harper
- 15
- Needed
- 30
2021
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Harper 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
Harper County, At a glance
Harper County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Harper County is a
USGS geologic potential: Moderate across 94% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Harper County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 20.0% |
| 2017 | 33.3% |
| 2018 | 50.0% |
| 2019 | 50.0% |
| 2020 | 33.3% |
| 2021 | 0.0% |
| 2022 | 16.7% |
2022: 16.7%. Across these years the share ran from 0.0% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 6 tests were reported to CDC for Harper 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).
Harper County, Compared
Harper County radon figures, compared
Calculated by Radon411CDC's largest figure for Harper County rests on 15 tests in 2021, 0 of them at or above 4 pCi/L, so each test moves its share by 6.7 points and no rank or comparison is drawn from it. Results reached as high as 3.7 pCi/L, with a middle value of 2.5 pCi/L.
Sumner County, the one bordering county with a figure in 2019, reported 32.8% of its tests at or above 4 pCi/L. Farther out, Sedgwick County (48 miles away) at 24.0%, Reno County (53 miles away) at 20.8% and Cowley County (68 miles away) at 41.6% 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 Harper County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 94% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Harper County, Geology
The ground under Harper County
PredictedMost of the ground under Harper County is one class on USGS's geologic map: 93.6% of its land is moderate radon potential, with 5.8% high and 0.5% low. The map puts 93.6% of Harper County in the area it calls Glaciated Area and 5.8% in Ogallala Formation, with one smaller area beside them. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glaciated Area | Glacial till underlain by Pennsylvanian and Permian marine and nonmarine sedimentary shale, sandstone, limestone, coal. | Moderate | 9 | 93.6% |
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and loess deposits. | High | 12 | 5.8% |
| Central Oklahoma Plains and Hills | Nonmarine Permian and Tertiary rocks, including shale, sandstone, and conglomerate in the western part, and Mississippian and Pennsylvanian rocks in the eastern part. | Low | 7 | 0.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Harper County beside the ground around it
Kansas as a whole has more high-potential ground than Harper County: 59.9% of its land, against 5.8% here. Of the 5 counties that border it, 2 have more high-potential ground, Kingman County the most at 51.8%.
The map rates the ground, not the air in any home.
Local help
Harper County, Local resources
Radon testing and mitigation in Harper 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
Harper County, Questions
Questions about radon in Harper County
Are radon levels high in Harper County?
In 2022, 16.7% of the radon tests reported to CDC for Harper County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Sumner County, the one bordering county with a figure in 2019, reported 32.8% of its tests at or above 4 pCi/L.
Which counties border Harper County?
Harper County borders 5 counties: Kingman County, KS, Grant County, OK, Alfalfa County, OK, Barber County, KS and Sumner County, KS.
Products
Harper County, Products
Testing a home in Harper County
No CDC figure names Harper County; the nearest county with one, Sumner County (33 miles away), reported 32.8% of its tests at or above 4 pCi/L in 2019, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Harper County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Harper County, Bordering counties
Counties bordering Harper County
Calculated by Radon411- Radon levels in Sumner County, KSEPA zone 2
32.8%at or above 4 pCi/L
Median 2.2 pCi/L · 58 tests
- Radon levels in Kingman County, KSEPA zone 1
4.0%at or above 4 pCi/L
Median 1.6 pCi/L · 25 tests
- Radon levels in Barber County, KSEPA zone 2
0.0%at or above 4 pCi/L
Median 1.6 pCi/L · 7 tests
- Radon levels in Grant County, OKEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in Alfalfa County, OKEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
Harper County, Cities and towns
Cities and towns in Harper County
About 5,370 people live in Harper County by the Census Bureau's estimate for July 1, 2025, 101 fewer than in 2020 (−1.8%). Spread over its land, that is 6.7 people to the square mile. Its largest town, Anthony, has 2,034 residents, 37.9% of the total. Together its 6 incorporated places hold 72.6% of those residents; the other 27.4% live outside any of them. Reported testing is thin here: 15 tests over 2021, or 2.8 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 23.5.
From Anthony to Waldron, CDC publishes no figure by town: each reads Harper County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Anthony | 2,034 | −2.4% | 37.9% |
| Harper | 1,287 | −1.3% | 24.0% |
| Attica | 499 | −2.7% | 9.3% |
| Bluff City | 44 | −2.2% | 0.8% |
| Danville | 28 | −3.4% | 0.5% |
| Waldron | 8 | Level | 0.1% |
6 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).
Harper County, Homes
Homes in Harper County
Harper County is a place of houses on their own lots: 85% of its 3,026 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 56% date from before 1960. 74% of occupied homes are lived in by their owner (Kansas: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Harper County | Kansas |
|---|---|---|
| Housing units | 3,026 | 1,285,221 |
| Detached houses | 85% | 72% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 56% | 33% |
| Built since 2000 | 6% | 20% |
| Middle year built | 1957 | 1975 |
| Owner-occupied | 74% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.