Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
Locations and reports
Radon Levels in Chase County, Kansas
EPA puts Chase County in Zone 2, its middle 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
38.0%
Lyon County
- Lyon
- 38.0%
- Butler
- 27.8%
3 of 5 neighbours have 30+ tests, 2019
Nearest county
38.0%
Lyon County, 26 miles
- Lyon
- 38.0%
- Kansas
- 33.7%
Share at 4+ pCi/L, 50 tests, 2019
Ground above low
100.0%
Level with Kansas
- Chase
- 100.0%
- Kansas
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
12
Too few for a share
- Chase
- 12
- Needed
- 30
2018
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 Chase 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
Chase County, At a glance
Chase County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Chase County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Chase County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2017 | 25.0% |
| 2018 | 66.7% |
| 2019 | 50.0% |
| 2022 | 66.7% |
2022: 66.7%. Across these years the share ran from 25.0% to 66.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 3 tests were reported to CDC for Chase 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: 2017 to 2022 (every CDC figure on file).
Chase County, Compared
Chase County radon figures, compared
Calculated by Radon411CDC's largest figure for Chase County rests on 12 tests in 2018, 8 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 31.2 pCi/L, with a middle value of 5.8 pCi/L.
Of the counties bordering it, 3 have a figure in 2019: Lyon County reported the largest share at or above 4 pCi/L, 38.0%, and Butler County the smallest, 27.8%, with Marion County at 35.1% between. Farther out, Harvey County (49 miles away) at 36.2%, Geary County (49 miles away) at 30.9% and Dickinson County (49 miles away) at 30.8% 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 Chase County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Chase County, Geology
The ground under Chase County
PredictedUSGS's geologic map puts all of Chase County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Glaciated Area, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Chase County beside the ground around it
Across Kansas 59.9% of the land is rated high; none of Chase County's is. Of the 5 counties that border it, 2 have more high-potential ground, Morris County the most at 20.0%.
The map rates the ground, not the air in any home.
Local help
Chase County, Local resources
Radon testing and mitigation in Chase 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
Chase County, Questions
Questions about radon in Chase County
Are radon levels high in Chase County?
In 2022, 66.7% of the radon tests reported to CDC for Chase County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.4 pCi/L. Of the counties bordering it, 3 have a figure in 2019: Lyon County reported the largest share at or above 4 pCi/L, 38.0%, and Butler County the smallest, 27.8%, with Marion County at 35.1% between.
Which counties border Chase County?
Chase County borders 5 counties: Marion County, Lyon County, Morris County, Greenwood County and Butler County.
Products
Chase County, Products
Testing a home in Chase County
No CDC figure names Chase County; the nearest county with one, Lyon County (26 miles away), reported 38.0% 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 Chase 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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Chase County, Bordering counties
Counties bordering Chase County
Calculated by Radon411- Radon levels in Morris CountyEPA zone 2
42.9%at or above 4 pCi/L
Median 3.1 pCi/L · 28 tests
- Radon levels in Lyon CountyEPA zone 2
38.0%at or above 4 pCi/L
Median 2.7 pCi/L · 50 tests
- Radon levels in Marion CountyEPA zone 1
35.1%at or above 4 pCi/L
Median 2.5 pCi/L · 37 tests
- Radon levels in Butler CountyEPA zone 2
27.8%at or above 4 pCi/L
Median 2.3 pCi/L · 511 tests
- Radon levels in Greenwood CountyEPA zone 2
16.7%at or above 4 pCi/L
Median 2.1 pCi/L · 6 tests
Chase County, Cities and towns
Cities and towns in Chase County
Chase County's population has barely moved since 2020: 2,572 residents on July 1, 2025 against 2,574 then, by the Census Bureau's estimates. Spread over its land, that is 3.3 people to the square mile. Its largest town, Cottonwood Falls, has 860 residents, 33.4% of the total. Together its 5 incorporated places hold 52.8% of those residents; the other 47.2% live outside any of them. Reported testing is thin here: 12 tests over 2018, or 4.7 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 7.8.
From Cottonwood Falls to Cedar Point, CDC publishes no figure by town: each reads Chase County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cottonwood Falls | 860 | +1.3% | 33.4% |
| Strong City | 385 | −0.5% | 15.0% |
| Matfield Green | 50 | −3.8% | 1.9% |
| Elmdale | 41 | Level | 1.6% |
| Cedar Point | 22 | Level | 0.9% |
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).
Chase County, Homes
Homes in Chase County
Chase County is a place of houses on their own lots: 84% of its 1,397 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1958 (1975 for Kansas), and 53% date from before 1960. 72% 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 | Chase County | Kansas |
|---|---|---|
| Housing units | 1,397 | 1,285,221 |
| Detached houses | 84% | 72% |
| In buildings of 5 or more | under 1% | 13% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 53% | 33% |
| Built since 2000 | 7% | 20% |
| Middle year built | 1958 | 1975 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.