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 Blackford County, Indiana
EPA puts Blackford County in Zone 1, its highest radon zone, and only 11 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
58.2%
Grant County
- Grant
- 58.2%
- Wells
- 47.8%
3 of 4 neighbours have 30+ tests, 2008 to 2017
Nearest county
55.1%
Delaware County, 17 miles
- Delaware
- 55.1%
- Indiana
- 38.9%
Share at 4+ pCi/L, 187 tests, 2008 to 2017
Ground above low
100.0%
Level with Indiana
- Blackford
- 100.0%
- Indiana
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
11
Too few for a share
- Blackford
- 11
- Needed
- 30
2008 to 2017, 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 Blackford 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
Blackford County, At a glance
Blackford County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Blackford 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 Blackford County, 2008 to 2017, laboratory
CDC holds 11 reported tests for Blackford County over the 2008 to 2017 laboratory totals, with a median of 3.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Blackford County beside the counties around it is how this page reads it.
What these figures count
Only 11 tests were reported to CDC for Blackford 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).
Blackford County, Compared
Blackford County radon figures, compared
Calculated by Radon411CDC's largest figure for Blackford County rests on 11 tests over the 2008 to 2017 laboratory totals, 4 of them at or above 4 pCi/L, so each test moves its share by 9.1 points and no rank or comparison is drawn from it. Results reached as high as 8.5 pCi/L, with a middle value of 3.6 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Grant County reported the largest share at or above 4 pCi/L, 58.2%, and Wells County the smallest, 47.8%, with Delaware County at 55.1% between. Farther out, Huntington County (26 miles away) at 43.8%, Adams County (28 miles away) at 48.5% and Madison County (30 miles away) at 49.0% 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 Blackford 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.
Blackford County, Geology
The ground under Blackford County
PredictedUSGS's geologic map puts all of Blackford 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Blackford County beside the ground around it
Blackford County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 4 counties that border it, none has as large a share of high-potential ground; Delaware County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Blackford County, Local resources
Radon testing and mitigation in Blackford 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
Blackford County, Questions
Questions about radon in Blackford County
Are radon levels high in Blackford County?
Over the 2008 to 2017 laboratory totals, 36.4% of the radon tests reported to CDC for Blackford County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.6 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Grant County reported the largest share at or above 4 pCi/L, 58.2%, and Wells County the smallest, 47.8%, with Delaware County at 55.1% between.
Which counties border Blackford County?
Blackford County borders 4 counties: Jay County, Grant County, Delaware County and Wells County.
Products
Blackford County, Products
Testing a home in Blackford County
No CDC figure names Blackford County; the nearest county with one, Delaware County (17 miles away), reported 55.1% 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 Blackford 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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Blackford County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Blackford County
Explore
Blackford County, Bordering counties
Counties bordering Blackford County
Calculated by Radon411- Radon levels in Grant CountyEPA zone 1
58.2%at or above 4 pCi/L
Median 4.6 pCi/L · 79 tests
- Radon levels in Delaware CountyEPA zone 1
55.1%at or above 4 pCi/L
Median 4.2 pCi/L · 187 tests
- Radon levels in Wells CountyEPA zone 1
47.8%at or above 4 pCi/L
Median 3.6 pCi/L · 161 tests
- Radon levels in Jay CountyEPA zone 1
44.4%at or above 4 pCi/L
Median 2.7 pCi/L · 9 tests
Blackford County, Cities and towns
Cities and towns in Blackford County
About 11,730 people live in Blackford County by the Census Bureau's estimate for July 1, 2025, 378 fewer than in 2020 (−3.1%). That works out to 71 people per square mile of land. Hartford City alone is home to 5,898 of them, 50.3% of the total. Reported testing is thin here: 11 tests over 2008 to 2017, or 0.9 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.
From Hartford City to Shamrock Lakes, CDC publishes no figure by town: each reads Blackford County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hartford City | 5,898 | −3.0% | 50.3% |
| Dunkirkextends beyond Blackford County | 2,097 | −3.1% | Counted whole |
| Montpelier | 1,489 | −3.1% | 12.7% |
| Shamrock Lakes | 215 | −3.2% | 1.8% |
4 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 Blackford County is counted whole, so it has no share.
Blackford County, Homes
Homes in Blackford County
Blackford County is a place of houses on their own lots: 78% of its 5,863 homes are detached single-family houses, against 73% across Indiana. The homes are older than Indiana's as a whole: half were built before 1959 (1976 for Indiana), and 51% date from before 1960. 74% of occupied homes are lived in by their owner (Indiana: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Blackford County | Indiana |
|---|---|---|
| Housing units | 5,863 | 2,953,344 |
| Detached houses | 78% | 73% |
| In buildings of 5 or more | 9% | 13% |
| Mobile homes | 7% | 4% |
| Built before 1960 | 51% | 32% |
| Built since 2000 | 7% | 21% |
| Middle year built | 1959 | 1976 |
| Owner-occupied | 74% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.