At Your Service DBA WIN Home Inspection
Columbus, OH
Listed for: Testing
Verified:Ohio state license
Call At Your Service DBA WIN Home Inspection at (614) 781-1070No website listed
Locations and reports
Radon in Columbus, Ohio
Columbus lies in 3 counties, in EPA Zone 1; 97.8% of it is in Franklin County, where 71.9% of 16,142 reported tests (2008 to 2017, laboratory totals) 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
71.9%
19.6 pts above OH
- Franklin
- 71.9%
- Ohio
- 52.3%
Franklin, 6th of 79 in OH, 2008 to 2017
Median result
6.8pCi/L
Action level reached
- Franklin
- 6.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Franklin's tests, 2008 to 2017
Highest county
76.8%
Fairfield
- Fairfield
- 76.8%
- Franklin
- 71.9%
3 counties, 3 with 30+ tests, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Franklin; Delaware Zone 1, Fairfield Zone 1
Tests reported
16,142
In Franklin
- Franklin
- 16,142
- Delaware
- 3,730
Reported to CDC before any fix, 2008 to 2017
Read a result for Columbus
Starts at Franklin County's median, 6.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 6.8 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. Franklin County's median reported result, 2008 to 2017.
The data
Columbus, What is published
What is published for Columbus
Information:
Every figure for Columbus is a county's
Radon data is published by county, not by city, and Columbus reaches into 3 counties: Franklin County, Delaware County and Fairfield 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.
Columbus covers 220 square miles of land across 3 counties: 97.8% in Franklin County, 1.5% in Delaware County and 0.8% in Fairfield County. About 938,396 people live there, 4,265 to the square mile.
Columbus, Counties
Columbus's counties, side by side
MeasuredEach county's own EPA zone and its own published CDC figures for 2008 to 2017, laboratory, 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.
- Franklin County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 71.9%
- Median result
- 6.8 pCi/L
- Tests reported
- 16,142 tests
- Annual years on file
- None
- Delaware County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 72.2%
- Median result
- 6.4 pCi/L
- Tests reported
- 3,730 tests
- Annual years on file
- None
- Fairfield County
- EPA zone
- Zone 1: Highest predicted potential
- At or above 4 pCi/L
- 76.8%
- Median result
- 7.4 pCi/L
- Tests reported
- 1,175 tests
- Annual years on file
- None
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| Franklin County | Zone 1: Highest predicted potential | 71.9% | 6.8 pCi/L | 16,142 tests | None |
| Delaware County | Zone 1: Highest predicted potential | 72.2% | 6.4 pCi/L | 3,730 tests | None |
| Fairfield County | Zone 1: Highest predicted potential | 76.8% | 7.4 pCi/L | 1,175 tests | None |
Columbus spans 3 counties, each with its own EPA zone and its own CDC figure: Franklin County (Zone 1, 71.9% of 16,142 tests), Delaware County (Zone 1, 72.2% of 3,730 tests) and Fairfield County (Zone 1, 76.8% of 1,175 tests).
Franklin County ranks 6th of 79 Ohio counties with 30 or more tests for that period, 19.6 points above the 52.3% pooled across Ohio's counties, 36.2 points above the national pool of 35.7%. Of the city's other counties, Delaware County reported 72.2% and Fairfield County reported 76.8%.
The counties nearest Columbus with a CDC figure for 2008 to 2017, laboratory, measured from the middle of the city: Madison County (23 miles, 67.4% of 549 tests), Pickaway County (24 miles, 81.4% of 183 tests) and Licking County (28 miles, 71.2% of 4,694 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 57.5% to 81.4%; the farthest of them, Clark County, is 43 miles away at 57.5%.
The directory lists 31 businesses with an address in Columbus, 23 for testing and 11 for mitigation. Ohio's other cities with a page of their own: Dayton, Cincinnati, Toledo and Cleveland.
Against Ohio and its other counties
Shares of tests people chose to run and report, by county (2008 to 2017, laboratory); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.
The counties around Columbus
By distance from the middle of Columbus; counties with 30 or more tests.
The median reported pre-mitigation result for 2008 to 2017, laboratory was 6.8 pCi/L in Franklin County, 6.4 pCi/L in Delaware County and 7.4 pCi/L in Fairfield County.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Columbus, Geology
The ground under Columbus
PredictedUSGS's geologic map puts all of Columbus' mapped land in one class: high radon potential. All of it lies in the area the map calls Till Plains, to which USGS gives a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Till Plains | Glacial deposits underlain by Ordovician through Devonian limestone and shale. | High | 14 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Columbus beside its counties and Ohio
All of Columbus, like all of Franklin County, is rated high. Columbus has more high-potential ground than Ohio as a whole: 100% of its land against 62.8%.
The map rates the ground, not the air in any home.
Columbus, Homes
Homes in Columbus
Columbus has 420,068 homes, and many share a building: 31% are in buildings of five or more, 45% are detached houses, against 53% across Franklin County. Half of its homes were built before 1980, close to Franklin County's 1979: 26% date from before 1960 and 22% from 2000 or later. Most occupied homes here are rented: owners live in 44% (Franklin County: 53%). A tenant can run a test; a fix is the landlord's to make.
| Homes | Columbus | Franklin County | Ohio |
|---|---|---|---|
| Housing units | 420,068 | 588,892 | 5,271,573 |
| Detached houses | 45% | 53% | 69% |
| In buildings of 5 or more | 31% | 25% | 15% |
| Mobile homes | 1% | 1% | 4% |
| Built before 1960 | 26% | 26% | 38% |
| Built since 2000 | 22% | 22% | 16% |
| Middle year built | 1980 | 1979 | 1970 |
| Owner-occupied | 44% | 53% | 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
Columbus, Professionals
Radon professionals listed in Columbus
Businesses whose listed city is Columbus, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Columbus: 1 of 6
31 listings with Columbus as the city. See radon mitigation and testing in Columbus, or all radon professionals in Ohio.
Columbus, Local resources
Local resources for Columbus
Who to ask in Ohio: its radon program, test kits and professionals.
What it means
Columbus, Questions
Questions about radon in Columbus
What radon zone is Columbus in?
All 3 counties Columbus reaches into (Franklin County, Delaware County and Fairfield 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 Columbus.
What are radon levels in Columbus?
71.9% of the 16,142 tests reported from Franklin County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home: high results are ordinary around Columbus. The median reported result was 6.8 pCi/L. Delaware County reported 72.2% of 3,730 tests and Fairfield County reported 76.8% of 1,175 tests; the counties are kept apart.
Should I test my home in Columbus?
Yes. About 11,606 of the 16,142 tests reported from Franklin County were at or above 4 pCi/L. That is above Ohio's pooled 52.3%, and ranks Franklin County 6th of the 79 Ohio counties with 30 or more tests. No map says which homes those are. How to test a home.
What ground is Columbus built on, as far as radon goes?
USGS's geologic map puts all of Columbus on one named area, "Till Plains", rated high for radon potential, radon index 14.
Is radon higher in the counties around Columbus?
Some are and some are not. Against Franklin County's 71.9%, 2 of the 8 nearest counties with a figure report more and 6 less, from Clark County (57.5%, 43 miles off) to Pickaway County (81.4%, 24 miles off).
Who tests for or fixes radon in Columbus?
Radon411's directory has 31 businesses with an address in Columbus, 23 listed for testing and 11 for mitigation. Every entry names the public list it was taken from. Radon professionals in Columbus.
The answers use the published figures of Franklin County, Delaware County and Fairfield County, the counties Columbus lies in.
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