Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Brown County, Ohio
EPA puts Brown County in Zone 2, its middle radon zone, and high results are common there: 47.1% of the 70 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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
47.1%
5.2 pts below OH
- Brown
- 47.1%
- Ohio
- 52.3%
70 tests, 2008 to 2017
Median result
3.3pCi/L
Below action level
- Brown
- 3.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
70
67th of 79 by tests
- Brown
- 70
- Franklin
- 16,142
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Ohio
53 of 79
Middle half
- Brown
- 47.1%
- Pickaway
- 81.4%
By share, of 79 with 30+ tests
Read a result for Brown County
Starts at Brown County's median, 3.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.3 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. Brown County's median reported result, 2008 to 2017.
The data
Brown County, At a glance
Brown County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Brown 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 Brown County, 2008 to 2017, laboratory
Under 2 pCi/L: 27%2 to 4 pCi/L: 26%4 pCi/L and above: 47%
Of 70 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 19 | 27.1% |
| 2 to 4 pCi/L | 18 | 25.7% |
| 4 pCi/L and above | 33 | 47.1% |
What these figures count
These are the 70 tests reported to CDC for Brown County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Brown County, Compared
Brown County radon figures, compared
Calculated by Radon411In Brown County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (33 of 70) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 11.4 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Brown County runs 5.2 points below its state.
Of 4 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 25.0% (Mason County, KY) to 56.7% (Highland County). By share, Brown County is 53rd of 79 Ohio counties with 30 or more tests for the same period.
Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 15.6 pCi/L. Below the action level, 19 tests (27.1%) came in under 2 pCi/L, against 23.1% statewide, and 18 tests (25.7%) fell between 2 and 4, against 24.6% statewide.
Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 47.1% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.
CDC's ten-year totals for Brown County went from 59 tests (2005 to 2014) to 70 (2008 to 2017), the share going from 49.2% to 47.1%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Brown County, Geology
The ground under Brown County
PredictedUSGS's geologic map puts all of Brown County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Till Plains, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Till Plains | Ordovician shale and limestone; glacial till. | Moderate | 11 | 99.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Brown County beside the ground around it
Across Ohio 62.8% of the land is rated high; none of Brown County's is. Of the 6 counties that border it, 5 have more high-potential ground, Clinton County the most at 74.0%.
The map rates the ground, not the air in any home.
Local help
Brown County, Local resources
Radon testing and mitigation in Brown County
Listed radon businesses with an address in Brown County:
- Radon Education and Licensing ProgramRadon Education and Licensing Program, run by Ohio Department of Health, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Ohio.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Free radon test kits are available for Ohio homeowners.
- Compare kits
- Professionals in Ohio479 professionals are listed in Ohio.
Listed radon professionals by town: Georgetown
What Ohio's program says
- Phone
- 614-728-0272
- indoor.radon@odh.ohio.gov
- Licensing of radon professionals
This program licenses companies and persons directly involved with the radon testing and mitigation industry.
What it means
Brown County, Questions
Questions about radon in Brown County
Are radon levels high in Brown County?
Over the 2008 to 2017 laboratory totals, 47.1% of the radon tests reported to CDC for Brown County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 52 reported a higher share; pooled, the state comes to 52.3%.
Which counties border Brown County?
Brown County borders 6 counties: Clermont County, OH, Bracken County, KY, Mason County, KY, Adams County, OH, Highland County, OH and Clinton County, OH.
Products
Brown County, Products
Testing a home in Brown County
In Brown County, 47.1% of 70 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Brown 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
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Brown County, Bordering counties
Counties bordering Brown County
Calculated by Radon411- Radon levels in Highland County, OHEPA zone 2
56.7%at or above 4 pCi/L
Median 4.8 pCi/L · 67 tests · 9.6 points above Brown County
- Radon levels in Clinton County, OHEPA zone 1
52.4%at or above 4 pCi/L
Median 4.2 pCi/L · 103 tests · 5.3 points above Brown County
- Radon levels in Clermont County, OHEPA zone 2
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 1,363 tests · 2.9 points above Brown County
- Radon levels in Adams County, OHEPA zone 1
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 18 tests · 2.9 points above Brown County
- Radon levels in Mason County, KYEPA zone 2
25.0%at or above 4 pCi/L
Median 2.6 pCi/L · 32 tests · 22.1 points below Brown County
- Radon levels in Bracken County, KYEPA zone 2
20.0%at or above 4 pCi/L
Median 2.0 pCi/L · 5 tests · 27.1 points below Brown County
Brown County, Cities and towns
Cities and towns in Brown County
The Census Bureau estimates 44,397 residents in Brown County for July 1, 2025, 713 more than in 2020 (+1.6%). That works out to 91 people per square mile of land. No town dominates: Georgetown, the largest, has 4,450 residents, 10.0% of the total. Reported testing is thin here: 70 tests over 2008 to 2017, or 1.6 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.
From Georgetown to Higginsport, CDC publishes no figure by town: each reads Brown County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Georgetown | 4,450 | −0.1% | 10.0% |
| Mount Orab | 4,418 | +1.5% | 10.0% |
| Ripley | 1,597 | +1.3% | 3.6% |
| Aberdeen | 1,551 | +2.2% | 3.5% |
| Sardiniaextends beyond Brown County | 1,101 | +1.8% | Counted whole |
| Russellville | 548 | +1.7% | 1.2% |
| Hamersville | 503 | +1.6% | 1.1% |
| Fayetteville | 318 | +0.6% | 0.7% |
| Higginsport | 219 | +1.4% | 0.5% |
9 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). A place that extends beyond Brown County is counted whole, so it has no share.
Brown County, Homes
Homes in Brown County
Brown County is a place of houses on their own lots: 76% of its 19,460 homes are detached single-family houses, against 69% across Ohio. Much of Brown County is recent building: 17% of its homes have gone up since 2000 and the middle year built is 1982, against 1970 for Ohio. Owners live in 76% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.
| Homes | Brown County | Ohio |
|---|---|---|
| Housing units | 19,460 | 5,271,573 |
| Detached houses | 76% | 69% |
| In buildings of 5 or more | 4% | 15% |
| Mobile homes | 15% | 4% |
| Built before 1960 | 26% | 38% |
| Built since 2000 | 17% | 16% |
| Middle year built | 1982 | 1970 |
| Owner-occupied | 76% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.