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 Jay County, Indiana
EPA puts Jay County in Zone 1, its highest radon zone, and only 9 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
63.7%
Darke County
- Darke
- 63.7%
- Wells
- 47.8%
5 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
48.5%
Adams County, 22 miles
- Adams
- 48.5%
- Indiana
- 38.9%
Share at 4+ pCi/L, 66 tests, 2008 to 2017
Ground above low
100.0%
Level with Indiana
- Jay
- 100.0%
- Indiana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
10
Too few for a share
- Jay
- 10
- Needed
- 30
2007 to 2016, laboratory
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Read a result for Jay County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 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.
The data
Jay County, At a glance
Jay County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Jay 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 Jay County, 2008 to 2017, laboratory
CDC holds 9 reported tests for Jay County over the 2008 to 2017 laboratory totals, with a median of 2.7 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Jay County beside the counties around it is how this page reads it.
What these figures count
Only 9 tests were reported to CDC for Jay County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Jay County, Compared
Jay County radon figures, compared
Calculated by Radon411CDC's largest figure for Jay County rests on 10 tests over the 2007 to 2016 laboratory totals, 4 of them at or above 4 pCi/L, so each test moves its share by 10.0 points and no rank or comparison is drawn from it. Results reached as high as 5.7 pCi/L, with a middle value of 2.7 pCi/L.
Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Darke County, OH reported the largest share at or above 4 pCi/L, 63.7%, and Wells County the smallest, 47.8%, with Mercer County, OH at 57.7%, Delaware County at 55.1% and Adams County at 48.5% between. Farther out, Grant County (35 miles away) at 58.2%, Huntington County (37 miles away) at 43.8% and Wayne County (40 miles away) at 56.4% have figures too. Pooled across 92 Indiana counties, 38.9% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%). EPA's 1993 map puts Jay County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Jay County, Geology
The ground under Jay County
PredictedUSGS's geologic map puts all of Jay County's mapped land in one class: high radon potential. All of it lies in the area the map calls Huron-Erie Lobe, to which USGS gives a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Huron-Erie Lobe | Calcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks. | High | 13 | 99.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Jay County beside the ground around it
Jay County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 7 counties that border it, none has as large a share of high-potential ground; Adams County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Jay County, Local resources
Radon testing and mitigation in Jay County
- Indiana's radon programIndiana Department of HealthIndiana's radon program licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Indiana.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
To purchase a low-cost radon short term or long term test kit, please visit the American Lung Association
- Compare kits
- Professionals in Indiana17 professionals are listed in Indiana.
What Indiana's program says
- Phone
- 1-800-272-9723
- Licensing of radon professionals
According to the Indiana Radon Rule, 410 IAC 5.1, everyone who is serving Indiana by doing radon testing, analysis and mitigation (radon reduction) in residential structures must be certified by the Indiana State Department of Health.
What it means
Jay County, Questions
Questions about radon in Jay County
Are radon levels high in Jay County?
Over the 2008 to 2017 laboratory totals, 44.4% of the radon tests reported to CDC for Jay County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of the counties bordering it, 5 have a figure over the 2008 to 2017 laboratory totals: Darke County, OH reported the largest share at or above 4 pCi/L, 63.7%, and Wells County the smallest, 47.8%, with Mercer County, OH at 57.7%, Delaware County at 55.1% and Adams County at 48.5% between.
Which counties border Jay County?
Jay County borders 7 counties: Blackford County, IN, Randolph County, IN, Mercer County, OH, Wells County, IN, Adams County, IN, Delaware County, IN and Darke County, OH.
Products
Jay County, Products
Testing a home in Jay County
No CDC figure names Jay County; the nearest county with one, Adams County (22 miles away), reported 48.5% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 1 the year-round level in Jay 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
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
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
Jay County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Jay County
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Jay County, Bordering counties
Counties bordering Jay County
Calculated by Radon411- Radon levels in Darke County, OHEPA zone 1
63.7%at or above 4 pCi/L
Median 5.6 pCi/L · 270 tests
- Radon levels in Randolph County, INEPA zone 1
60.7%at or above 4 pCi/L
Median 4.5 pCi/L · 28 tests
- Radon levels in Mercer County, OHEPA zone 1
57.7%at or above 4 pCi/L
Median 5.1 pCi/L · 149 tests
- Radon levels in Delaware County, INEPA zone 1
55.1%at or above 4 pCi/L
Median 4.2 pCi/L · 187 tests
- Radon levels in Adams County, INEPA zone 1
48.5%at or above 4 pCi/L
Median 3.8 pCi/L · 66 tests
- Radon levels in Wells County, INEPA zone 1
47.8%at or above 4 pCi/L
Median 3.6 pCi/L · 161 tests
- Radon levels in Blackford County, INEPA zone 1
36.4%at or above 4 pCi/L
Median 3.6 pCi/L · 11 tests
Jay County, Cities and towns
Cities and towns in Jay County
About 20,118 people live in Jay County by the Census Bureau's estimate for July 1, 2025, 362 fewer than in 2020 (−1.8%). That works out to 52 people per square mile of land. Its largest town, Portland, has 6,237 residents, 31.0% of the total. Reported testing is thin here: 10 tests over 2007 to 2016, or 0.5 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 5.7.
From Portland to Salamonia, CDC publishes no figure by town: each reads Jay County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Portland | 6,237 | −1.5% | 31.0% |
| Dunkirkextends beyond Jay County | 2,097 | −3.1% | Counted whole |
| Redkey | 1,071 | −2.0% | 5.3% |
| Pennville | 614 | −1.4% | 3.1% |
| Bryant | 236 | −1.3% | 1.2% |
| Salamonia | 149 | −0.7% | 0.7% |
6 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 Jay County is counted whole, so it has no share.
Jay County, Homes
Homes in Jay County
Jay County is a place of houses on their own lots: 84% of its 8,908 homes are detached single-family houses, against 73% across Indiana. The homes are older than Indiana's as a whole: half were built before 1958 (1976 for Indiana), and 52% date from before 1960. Owners live in 78% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.
| Homes | Jay County | Indiana |
|---|---|---|
| Housing units | 8,908 | 2,953,344 |
| Detached houses | 84% | 73% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 52% | 32% |
| Built since 2000 | 9% | 21% |
| Middle year built | 1958 | 1976 |
| Owner-occupied | 78% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.