Listed for: TestingMitigation
Verified:Kansas state license
Call Advanced Environmental Services INC at (785) 231-9443No website listed
Locations and reports
Radon in Topeka, Kansas
EPA puts Shawnee County, where Topeka is, in Zone 2, its middle radon zone, and 34.5% of its 388 reported radon tests (2022) were 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
34.5%
2.5 pts above KS
- Shawnee
- 34.5%
- Kansas
- 32.0%
Shawnee, 17th of 38 in KS, 2022
Median result
2.6pCi/L
Below action level
- Shawnee
- 2.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Shawnee's tests, 2022
Nearest county
39.6%
Jefferson, 22 miles
- Jefferson
- 39.6%
- Shawnee
- 34.5%
53 tests, 2022
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
Shawnee, where Topeka is
Tests reported
388
In Shawnee
- Shawnee
- 388
- Jefferson
- 53
Reported to CDC before any fix, 2022
Read a result for Topeka
Starts at Shawnee County's median, 2.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.6 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Shawnee County's median reported result, 2022.
The data
Topeka, What is published
What is published for Topeka
Information:
Every figure for Topeka is a county's
Radon data is published by county, not by city, so for Topeka it is Shawnee County's: its EPA zone (Zone 2) and the 388 tests reported to CDC for 2022. Only a test tells you about one home.
Topeka covers 61.4 square miles of land, all of it in Shawnee County. About 125,795 people live there, 2,047 to the square mile.
Topeka, Counties
The county Topeka lies in
MeasuredShawnee County's EPA zone and the figures CDC publishes for it, 2022.
Shawnee CountyZone 2Moderate predicted potential
- 34.5%
- Reported tests at or above 4 pCi/L
- 2.6 pCi/L
- Median reported result
- 388 tests
- Tests reported to CDC
- 7
- Annual years on file
Shawnee County ranks 17th of 38 Kansas counties with 30 or more tests for that period, 2.5 points above the 32.0% pooled across Kansas's counties, 10.6 points above the national pool of 23.9%.
The counties nearest Topeka with a CDC figure for 2022, measured from the middle of the city: Jefferson County (22 miles, 39.6% of 53 tests), Douglas County (24 miles, 25.8% of 868 tests) and Wabaunsee County (28 miles, 29.0% of 31 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 25.2% to 41.7%; the farthest of them, Lyon County, is 47 miles away at 31.9%.
The directory lists 6 businesses with an address in Topeka, 6 for testing and 1 for mitigation. Kansas's other cities with a page of their own: Wichita, Lawrence and Manhattan.
The counties around Topeka
By distance from the middle of Topeka; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2022.
Topeka, Geology
The ground under Topeka
PredictedMost of the ground under Topeka is one class on USGS's geologic map: 92.6% of its land is moderate radon potential, with 7.4% high. The map puts 92.6% of Topeka in the area it calls Glaciated Area and 7.4% in Glacial Drift. 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 | 92.6% |
| Glacial Drift | Glacial drift and loess of varying thickness, largely locally derived from underlying and nearby Paleozoic sedimentary rocks. | High | 12 | 7.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Topeka beside its county and Kansas
Shawnee County as a whole has more high-potential ground than Topeka: 20.7% of the county against 7.4% of the city. Kansas as a whole has more high-potential ground than Topeka: 59.9% of its land, against 7.4% here.
The map rates the ground, not the air in any home.
Topeka, Homes
Homes in Topeka
Of Topeka's 59,971 homes, 65% are detached houses, against 72% across Shawnee County; 19% are in buildings of five or more homes. Half of its homes were built before 1967, close to Shawnee County's 1971: 40% date from before 1960 and 11% from 2000 or later. 59% of occupied homes are lived in by their owner (Shawnee County: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Topeka | Shawnee County | Kansas |
|---|---|---|---|
| Housing units | 59,971 | 80,884 | 1,285,221 |
| Detached houses | 65% | 72% | 72% |
| In buildings of 5 or more | 19% | 14% | 13% |
| Mobile homes | 3% | 3% | 4% |
| Built before 1960 | 40% | 33% | 33% |
| Built since 2000 | 11% | 14% | 20% |
| Middle year built | 1967 | 1971 | 1975 |
| Owner-occupied | 59% | 67% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Topeka, Professionals
Radon professionals listed in Topeka
Businesses whose listed city is Topeka, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Topeka: 1 of 6
6 listings with Topeka as the city. See radon mitigation and testing in Topeka, or all radon professionals in Kansas.
Topeka, Local resources
Local resources for Topeka
Who to ask in Kansas: its radon program, test kits and professionals.
What it means
Topeka, Questions
Questions about radon in Topeka
What radon zone is Topeka in?
Topeka takes its zone from Shawnee County, which EPA puts in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.
What are radon levels in Topeka?
A high result is no surprise around Topeka: 34.5% of 388 tests reported from Shawnee County for 2022 reached 4 pCi/L or more. The median reported result was 2.6 pCi/L.
Should I test my home in Topeka?
Yes. About 134 of the 388 tests reported from Shawnee County were at or above 4 pCi/L. That is above Kansas' pooled 32.0%, and ranks Shawnee County 17th of the 38 Kansas counties with 30 or more tests. No map says which homes those are. How to test a home.
What ground is Topeka built on, as far as radon goes?
92.6% of Topeka sits on what USGS's map calls "Glaciated Area", rated moderate for radon potential, radon index 9; another 7.4% is "Glacial Drift", rated high for radon potential, radon index 12. So the ground changes within Topeka itself.
Is radon higher in the counties around Topeka?
Some are and some are not. Against Shawnee County's 34.5%, 2 of the 8 nearest counties with a figure report more and 6 less, from Pottawatomie County (25.2%, 42 miles off) to Atchison County (41.7%, 40 miles off).
Who tests for or fixes radon in Topeka?
Radon411's directory has 6 businesses with an address in Topeka, 6 listed for testing and 1 for mitigation. Every entry names the public list it was taken from. Radon professionals in Topeka.
The answers use the published figures of Shawnee County, the county Topeka lies in.
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