Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Perry County, Ohio
EPA puts Perry County in Zone 1, its highest radon zone, and high results are common there: 48.9% of the 90 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
48.9%
3.4 pts below OH
- Perry
- 48.9%
- Ohio
- 52.3%
90 tests, 2008 to 2017
Median result
3.8pCi/L
Below action level
- Perry
- 3.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
90
64th of 79 by tests
- Perry
- 90
- Franklin
- 16,142
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Ohio
51 of 79
Middle half
- Perry
- 48.9%
- Pickaway
- 81.4%
By share, of 79 with 30+ tests
Read a result for Perry County
Starts at Perry County's median, 3.8 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.8 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. Perry County's median reported result, 2008 to 2017.
The data
Perry County, At a glance
Perry County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Perry County in
USGS geologic potential: High across 58% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Perry County, 2008 to 2017, laboratory
Under 2 pCi/L: 14%2 to 4 pCi/L: 37%4 pCi/L and above: 49%
Of 90 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 13 | 14.4% |
| 2 to 4 pCi/L | 33 | 36.7% |
| 4 pCi/L and above | 44 | 48.9% |
What these figures count
These are the 90 tests reported to CDC for Perry 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).
Perry County, Compared
Perry County radon figures, compared
Calculated by Radon411In Perry County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (44 of 90) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 13.2 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Perry County runs 3.4 points below its state.
Of 5 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 38.1% (Athens County) to 76.8% (Fairfield County). By share, Perry County is 51st of 79 Ohio counties with 30 or more tests for the same period.
Half the tests came in under 3.8 pCi/L and half over it; the single highest reached 58.7 pCi/L. Below the action level, 13 tests (14.4%) came in under 2 pCi/L, against 23.1% statewide, and 33 tests (36.7%) fell between 2 and 4, against 24.6% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 48.9% share point the same way here. USGS geology rates 58% of the county's land high radon potential. CDC also counts 9 tests taken after mitigation in Perry County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Perry County went from 83 tests (2005 to 2014) to 90 (2008 to 2017), the share going from 55.4% to 48.9%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Perry County, Geology
The ground under Perry County
PredictedUSGS's geologic map splits Perry County: 58.4% of its land is high radon potential and 41.6% moderate. The map puts 41.6% of Perry County in the area it calls Unglaciated Plateau and 31.9% in Glaciated Plateau, with 2 smaller areas beside them. USGS gives the first a radon index of 11, 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 |
|---|---|---|---|---|
| Unglaciated Plateau | Mississippian through Permian limestone, dolomite, and shale. | Moderate | 11 | 41.6% |
| Glaciated Plateau | Pre-Wisconsin glacial deposits derived from high radioactivity marine black shale. | High | 12 | 31.9% |
| Till Plains | Glacial deposits underlain by Ordovician through Devonian limestone and shale. | High | 14 | 13.5% |
| Area of Elevated Radioactivity | Pennsylvanian shale, sandstone, coal, and limestone. | High | 12 | 12.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Perry County beside the ground around it
On high-potential ground Perry County is close to Ohio as a whole: 58.4% of its land against 62.8%. Of the 6 counties that border it, 3 have more high-potential ground, Fairfield County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Perry County, Local resources
Radon testing and mitigation in Perry County
Listed radon businesses with an address in Perry 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: New Lexington, Thornville
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
Perry County, Questions
Questions about radon in Perry County
Are radon levels high in Perry County?
Over the 2008 to 2017 laboratory totals, 48.9% of the radon tests reported to CDC for Perry County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.8 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 50 reported a higher share; pooled, the state comes to 52.3%.
Which counties border Perry County?
Perry County borders 6 counties: Hocking County, Fairfield County, Morgan County, Licking County, Muskingum County and Athens County.
Products
Perry County, Products
Testing a home in Perry County
In Perry County, 48.9% of 90 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 1 the year-round level in Perry County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorAEGTEST
HOUND-1011S rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Perry County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Perry County
Explore
Perry County, Bordering counties
Counties bordering Perry County
Calculated by Radon411- Radon levels in Fairfield CountyEPA zone 1
76.8%at or above 4 pCi/L
Median 7.4 pCi/L · 1,175 tests · 27.9 points above Perry County
- Radon levels in Licking CountyEPA zone 1
71.2%at or above 4 pCi/L
Median 7.0 pCi/L · 4,694 tests · 22.3 points above Perry County
- Radon levels in Muskingum CountyEPA zone 1
56.3%at or above 4 pCi/L
Median 4.9 pCi/L · 391 tests · 7.4 points above Perry County
- Radon levels in Hocking CountyEPA zone 2
53.3%at or above 4 pCi/L
Median 4.0 pCi/L · 60 tests · 4.4 points above Perry County
- Radon levels in Athens CountyEPA zone 2
38.1%at or above 4 pCi/L
Median 3.1 pCi/L · 318 tests · 10.8 points below Perry County
- Radon levels in Morgan CountyEPA zone 2
30.0%at or above 4 pCi/L
Median 3.3 pCi/L · 10 tests · 18.9 points below Perry County
Perry County, Cities and towns
Cities and towns in Perry County
The Census Bureau estimates 35,918 residents in Perry County for July 1, 2025, 459 more than in 2020 (+1.3%). That works out to 88 people per square mile of land. No town dominates: New Lexington, the largest, has 4,465 residents, 12.4% of the total. Reported testing is thin here: 90 tests over 2008 to 2017, or 2.5 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.
From New Lexington to Rendville, CDC publishes no figure by town: each reads Perry County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| New Lexington | 4,465 | +0.9% | 12.4% |
| Crooksville | 2,404 | −0.6% | 6.7% |
| Rosevilleextends beyond Perry County | 1,751 | +0.2% | Counted whole |
| Somerset | 1,482 | +0.1% | 4.1% |
| Thornville | 1,111 | +1.0% | 3.1% |
| Junction City | 722 | +0.1% | 2.0% |
| New Straitsville | 647 | −0.9% | 1.8% |
| Shawnee | 504 | −0.2% | 1.4% |
| Corning | 485 | −0.8% | 1.4% |
| Glenford | 170 | −1.2% | 0.5% |
| Hemlock | 148 | Level | 0.4% |
- Rendville
12 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Perry County is counted whole, so it has no share.
Perry County, Homes
Homes in Perry County
Of Perry County's 15,021 homes, 75% are detached houses, against 69% across Ohio; 17% are mobile homes. Much of Perry County is recent building: 21% of its homes have gone up since 2000 and the middle year built is 1978, against 1970 for Ohio. Owners live in 77% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.
| Homes | Perry County | Ohio |
|---|---|---|
| Housing units | 15,021 | 5,271,573 |
| Detached houses | 75% | 69% |
| In buildings of 5 or more | 6% | 15% |
| Mobile homes | 17% | 4% |
| Built before 1960 | 35% | 38% |
| Built since 2000 | 21% | 16% |
| Middle year built | 1978 | 1970 |
| Owner-occupied | 77% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.