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
Locations and reports
Radon Levels in Pickaway County, Ohio
EPA puts Pickaway County in Zone 1, its highest radon zone, and high results are common there: 81.4% of the 183 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
81.4%
29.1 pts above OH
- Pickaway
- 81.4%
- Ohio
- 52.3%
183 tests, 2008 to 2017
Median result
9.5pCi/L
Action level reached
- Pickaway
- 9.5 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
183
56th of 79 by tests
- Pickaway
- 183
- 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
1 of 79
Top quarter
- Pickaway
- 81.4%
- Pickaway
- 81.4%
By share, of 79 with 30+ tests
Read a result for Pickaway County
Starts at Pickaway County's median, 9.5 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 9.5 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. Pickaway County's median reported result, 2008 to 2017.
The data
Pickaway County, At a glance
Pickaway County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Pickaway County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Pickaway County, 2008 to 2017, laboratory
Under 2 pCi/L: 8%2 to 4 pCi/L: 10%4 pCi/L and above: 82%
Of 183 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 15 | 8.2% |
| 2 to 4 pCi/L | 19 | 10.4% |
| 4 pCi/L and above | 149 | 81.4% |
What these figures count
These are the 183 tests reported to CDC for Pickaway 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).
Pickaway County, Compared
Pickaway County radon figures, compared
Calculated by Radon411More than half: 81.4% of the 183 radon tests reported to CDC for Pickaway County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 1st of 79 Ohio counties with 30 or more tests for the same period. That is 29.1 points above the 52.3% pooled from 88 Ohio counties.
The median result, 9.5 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 127.9 pCi/L. The rest split 8.2% under 2 pCi/L and 10.4% from 2 to 4 (Ohio: 23.1% and 24.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 81.4% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Fairfield County at 76.8%, the lowest Hocking County at 53.3%. Statewide for the same period, Fairfield County reported the highest share (76.8%) and Cuyahoga County the lowest (21.7%).
CDC's ten-year totals for Pickaway County went from 150 tests (2005 to 2014) to 183 (2008 to 2017), the share going from 77.3% to 81.4%.
Nationally, every county with a figure for the same period pools to 35.7%; Pickaway County sits 45.7 points above it. CDC also counts 13 tests taken after mitigation in Pickaway County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Pickaway County, Geology
The ground under Pickaway County
PredictedUSGS's geologic map puts all of Pickaway County's 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.
Pickaway County beside the ground around it
Pickaway County has more high-potential ground than Ohio as a whole: 100% of its land against 62.8%. Of the 6 counties that border it, none has as large a share of high-potential ground; Fairfield County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Pickaway County, Local resources
Radon testing and mitigation in Pickaway County
Listed radon businesses with an address in Pickaway 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: Circleville
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
Pickaway County, Questions
Questions about radon in Pickaway County
Are radon levels high in Pickaway County?
Over the 2008 to 2017 laboratory totals, 81.4% of the radon tests reported to CDC for Pickaway County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 9.5 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 52.3%.
Which counties border Pickaway County?
Pickaway County borders 6 counties: Ross County, Fayette County, Franklin County, Madison County, Fairfield County and Hocking County.
Products
Pickaway County, Products
Testing a home in Pickaway County
In Pickaway County, 81.4% of 183 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 Pickaway 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
Monitor
RM-65 rechargeable radon detector with a color screen and alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Pickaway County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Pickaway County
Explore
Pickaway County, Bordering counties
Counties bordering Pickaway 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 · 4.6 points below Pickaway County
- Radon levels in Franklin CountyEPA zone 1
71.9%at or above 4 pCi/L
Median 6.8 pCi/L · 16,142 tests · 9.5 points below Pickaway County
- Radon levels in Madison CountyEPA zone 1
67.4%at or above 4 pCi/L
Median 5.7 pCi/L · 549 tests · 14.0 points below Pickaway County
- Radon levels in Ross CountyEPA zone 1
67.1%at or above 4 pCi/L
Median 7.0 pCi/L · 368 tests · 14.3 points below Pickaway County
- Radon levels in Fayette CountyEPA zone 1
58.3%at or above 4 pCi/L
Median 5.5 pCi/L · 12 tests · 23.1 points below Pickaway County
- Radon levels in Hocking CountyEPA zone 2
53.3%at or above 4 pCi/L
Median 4.0 pCi/L · 60 tests · 28.1 points below Pickaway County
Pickaway County, Cities and towns
Cities and towns in Pickaway County
Pickaway County is growing: the Census Bureau puts it at 62,978 residents on July 1, 2025, up 7.4% from 58,659 in 2020. That works out to 126 people per square mile of land. Its largest town, Circleville, has 14,634 residents, 23.2% of the total. Reported testing is thin here: 183 tests over 2008 to 2017, or 2.9 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.
From Circleville to Darbyville, CDC publishes no figure by town: each reads Pickaway County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Circleville | 14,634 | +4.9% | 23.2% |
| Ashville | 4,819 | +5.9% | 7.7% |
| South Bloomfield | 4,164 | +93.9% | 6.6% |
| Commercial Point | 3,271 | +5.8% | 5.2% |
| Williamsport | 1,027 | +5.2% | 1.6% |
| New Hollandextends beyond Pickaway County | 833 | +4.1% | Counted whole |
| Harrisburgextends beyond Pickaway County | 313 | −0.3% | Counted whole |
| Tarltonextends beyond Pickaway County | 269 | +5.9% | Counted whole |
| Lockbourneextends beyond Pickaway County | 228 | −3.8% | Counted whole |
| Darbyville | 189 | +2.2% | 0.3% |
10 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 Pickaway County is counted whole, so it has no share.
Pickaway County, Homes
Homes in Pickaway County
Pickaway County is a place of houses on their own lots: 79% of its 22,591 homes are detached single-family houses, against 69% across Ohio. Much of Pickaway County is recent building: 25% of its homes have gone up since 2000 and the middle year built is 1978, against 1970 for Ohio. 72% of occupied homes are lived in by their owner (Ohio: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Pickaway County | Ohio |
|---|---|---|
| Housing units | 22,591 | 5,271,573 |
| Detached houses | 79% | 69% |
| In buildings of 5 or more | 5% | 15% |
| Mobile homes | 7% | 4% |
| Built before 1960 | 28% | 38% |
| Built since 2000 | 25% | 16% |
| Middle year built | 1978 | 1970 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.