Listed for: TestingMitigation
Verified:Kansas state license
No phone or website on the list. Licenses on the profile.
Locations and reports
Radon in Manhattan, Kansas
Manhattan lies in 2 counties, in EPA Zone 1; 93.9% of it is in Riley County, where 31.3% of 800 reported tests (2022) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so the only way to know your home's level is to test it.
Data checked By Radon411Methodology
Share at 4+ pCi/L
31.3%
0.7 pts below KS
- Riley
- 31.3%
- Kansas
- 32.0%
Riley, 22nd of 38 in KS, 2022
Median result
1.9pCi/L
Below action level
- Riley
- 1.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Riley's tests, 2022
Highest county
31.3%
Riley
- Riley
- 31.3%
- Pottawatomie
- 25.2%
2 counties, 2 with 30+ tests, 2022
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Riley; Pottawatomie Zone 1
Tests reported
800
In Riley
- Riley
- 800
- Pottawatomie
- 206
Reported to CDC before any fix, 2022
Read a result for Manhattan
Starts at Riley County's median, 1.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.9 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Riley County's median reported result, 2022.
The data
Manhattan, What is published
What is published for Manhattan
Information:
Every figure for Manhattan is a county's
Radon data is published by county, not by city, and Manhattan reaches into 2 counties: Riley County and Pottawatomie County. Each has its own EPA zone and its own CDC test figures, set side by side below and each labelled with its county. Only a test tells you about one home.
Manhattan covers 19.9 square miles of land: 93.9% of it lies in Riley County and 6.1% in Pottawatomie County. About 54,673 people live there, 2,744 to the square mile.
Manhattan, Counties
Manhattan's counties, side by side
MeasuredEach county's own EPA zone and its own published CDC figures for 2022, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.
- Riley County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 31.3%
- Median result
- 1.9 pCi/L
- Tests reported
- 800 tests
- Annual years on file
- 7
- Pottawatomie County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 25.2%
- Median result
- 1.7 pCi/L
- Tests reported
- 206 tests
- Annual years on file
- 7
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| Riley County | Zone 1: Highest predicted potential | 31.3% | 1.9 pCi/L | 800 tests | 7 |
| Pottawatomie County | Zone 1: Highest predicted potential | 25.2% | 1.7 pCi/L | 206 tests | 7 |
Manhattan spans 2 counties, each with its own EPA zone and its own CDC figure: Riley County (Zone 1, 31.3% of 800 tests) and Pottawatomie County (Zone 1, 25.2% of 206 tests).
Riley County ranks 22nd of 38 Kansas counties with 30 or more tests for that period, 0.7 points below the 32.0% pooled across Kansas's counties, 7.4 points above the national pool of 23.9%. Of the city's other county, Pottawatomie County reported 25.2%.
Measured from the middle of Manhattan, the nearest counties with a CDC figure for 2022 are Geary County (15 miles, 25.2% of 365 tests), Wabaunsee County (27 miles, 29.0% of 31 tests) and Clay County (32 miles, 55.8% of 77 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 25.2% to 55.8%; the farthest of them, Cloud County, is 59 miles away at 54.6%.
The directory lists 7 businesses with an address in Manhattan, 7 for testing and 2 for mitigation. Kansas's other cities with a page of their own: Wichita, Lawrence and Topeka.
Against Kansas and its other counties
Shares of tests people chose to run and report, by county (2022); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.
The counties around Manhattan
By distance from the middle of Manhattan; counties with 30 or more tests.
The median reported pre-mitigation result for 2022 was 1.9 pCi/L in Riley County and 1.7 pCi/L in Pottawatomie County.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2022.
Manhattan, Geology
The ground under Manhattan
PredictedUSGS's geologic map puts all of Manhattan's mapped land in one class: high radon potential. All of it lies in the area the map calls Mid-Continent Rift Zone, to which USGS gives 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 |
|---|---|---|---|---|
| Mid-Continent Rift Zone | Faulted and fractured Permian limestone, dolomite, shale, and sandstone related to the Mid-Continent Rift zone. | High | 12 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Manhattan beside its counties and Kansas
All of Manhattan, like all of Riley County, is rated high. Manhattan has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%.
The map rates the ground, not the air in any home.
Manhattan, Homes
Homes in Manhattan
Manhattan has 24,334 homes, and many share a building: 31% are in buildings of five or more, 45% are detached houses, against 48% across Riley County. Half of its homes were built before 1983, close to Riley County's 1984: 21% date from before 1960 and 31% from 2000 or later. Most occupied homes here are rented: owners live in 41% (Riley County: 45%). A tenant can run a test; a fix is the landlord's to make.
| Homes | Manhattan | Riley County | Kansas |
|---|---|---|---|
| Housing units | 24,334 | 30,674 | 1,285,221 |
| Detached houses | 45% | 48% | 72% |
| In buildings of 5 or more | 31% | 26% | 13% |
| Mobile homes | 4% | 5% | 4% |
| Built before 1960 | 21% | 22% | 33% |
| Built since 2000 | 31% | 31% | 20% |
| Middle year built | 1983 | 1984 | 1975 |
| Owner-occupied | 41% | 45% | 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
Manhattan, Professionals
Radon professionals listed in Manhattan
Businesses whose listed city is Manhattan, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Manhattan: 1 of 6
7 listings with Manhattan as the city. See radon mitigation and testing in Manhattan, or all radon professionals in Kansas.
Manhattan, Local resources
Local resources for Manhattan
Who to ask in Kansas: its radon program, test kits and professionals.
What it means
Manhattan, Questions
Questions about radon in Manhattan
What radon zone is Manhattan in?
Both counties Manhattan reaches into (Riley County and Pottawatomie County) are in Zone 1, the map's highest class: a predicted county average above 4 pCi/L. EPA zones counties, not cities, so that is the zone for every part of Manhattan.
What are radon levels in Manhattan?
Around Manhattan, 31.3% of 800 tests reported from Riley County for 2022 reached 4 pCi/L or more, so a high result is no surprise here. The median reported result was 1.9 pCi/L. Pottawatomie County reported 25.2% of 206 tests; the counties are kept apart.
Should I test my home in Manhattan?
Yes. Riley County reported about 250 of its 800 tests at or above 4 pCi/L. That is about what Kansas as a whole reports (32.0%), and ranks Riley County 22nd of the 38 Kansas counties with 30 or more tests. Which homes they were, no map can say. How to test a home.
What ground is Manhattan built on, as far as radon goes?
USGS's geologic map puts all of Manhattan on one named area, "Mid-Continent Rift Zone", rated high for radon potential, radon index 12.
Is radon higher in the counties around Manhattan?
It depends which way you go. 6 of the 8 nearest counties with a figure report a larger share than Riley County's 31.3% and 2 a smaller one: from Geary County (25.2%, 15 miles off) to Clay County (55.8%, 32 miles off).
Who tests for or fixes radon in Manhattan?
Manhattan is the address of 7 businesses in Radon411's directory, 7 listed for testing and 2 for mitigation. Each entry names the public list it came from. Radon professionals in Manhattan.
The answers use the published figures of Riley County and Pottawatomie County, the counties Manhattan lies in.
Explore