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 Howard County, Indiana
EPA puts Howard County in Zone 1, its highest radon zone, and high results are common there: 49.1% of the 216 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
49.1%
10.2 pts above IN
- Howard
- 49.1%
- Indiana
- 38.9%
216 tests, 2008 to 2017
Median result
3.8pCi/L
Below action level
- Howard
- 3.8 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
216
28th of 69 by tests
- Howard
- 216
- St. Joseph
- 7,346
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 Indiana
19 of 69
Middle half
- Howard
- 49.1%
- Miami
- 63.3%
By share, of 69 with 30+ tests
Read a result for Howard County
Starts at Howard 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. Howard County's median reported result, 2008 to 2017.
The data
Howard County, At a glance
Howard County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Howard 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 Howard County, 2008 to 2017, laboratory
Under 2 pCi/L: 28%2 to 4 pCi/L: 23%4 pCi/L and above: 49%
Of 216 pre-mitigation tests reported to CDC, not homes in this area.
| Result band | Tests Measured | Share Measured |
|---|---|---|
| Under 2 pCi/L | 61 | 28.2% |
| 2 to 4 pCi/L | 49 | 22.7% |
| 4 pCi/L and above | 106 | 49.1% |
What these figures count
These are the 216 tests reported to CDC for Howard 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).
Howard County, Compared
Howard County radon figures, compared
Calculated by Radon411In Howard County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (106 of 216) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 13.4 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Howard County runs 10.2 points above its state.
Of 6 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 34.1% (Cass County) to 63.3% (Miami County). By share, Howard County is 19th of 69 Indiana 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 39.8 pCi/L. Below the action level, 61 tests (28.2%) came in under 2 pCi/L, against 32.8% statewide, and 49 tests (22.7%) fell between 2 and 4, against 28.3% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 49.1% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 11 tests taken after mitigation in Howard County for the same period: tests in homes where a fix was already in.
CDC's ten-year totals for Howard County went from 129 tests (2005 to 2014) to 216 (2008 to 2017), the share going from 53.5% to 49.1%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Howard County, Geology
The ground under Howard County
PredictedUSGS's geologic map puts all of Howard 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.
Howard County beside the ground around it
Howard County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 6 counties that border it, none has as large a share of high-potential ground; Carroll County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Howard County, Local resources
Radon testing and mitigation in Howard 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
Howard County, Questions
Questions about radon in Howard County
Are radon levels high in Howard County?
Over the 2008 to 2017 laboratory totals, 49.1% of the radon tests reported to CDC for Howard County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.8 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 18 reported a higher share; pooled, the state comes to 38.9%.
Which counties border Howard County?
Howard County borders 6 counties: Tipton County, Miami County, Clinton County, Grant County, Carroll County and Cass County.
Products
Howard County, Products
Testing a home in Howard County
In Howard County, 49.1% of 216 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 38.9% pooled across Indiana. In Zone 1 the year-round level in Howard 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
MonitorPYZYCKYH
RD17 plug-in radon detector with a rechargeable battery and color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 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
Howard County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Howard County
Explore
Howard County, Bordering counties
Counties bordering Howard County
Calculated by Radon411- Radon levels in Miami CountyEPA zone 1
63.3%at or above 4 pCi/L
Median 5.3 pCi/L · 30 tests · 14.2 points above Howard County
- Radon levels in Carroll CountyEPA zone 1
60.5%at or above 4 pCi/L
Median 5.8 pCi/L · 38 tests · 11.4 points above Howard County
- Radon levels in Grant CountyEPA zone 1
58.2%at or above 4 pCi/L
Median 4.6 pCi/L · 79 tests · 9.1 points above Howard County
- Radon levels in Tipton CountyEPA zone 1
49.3%at or above 4 pCi/L
Median 3.9 pCi/L · 69 tests · 0.2 points above Howard County
- Radon levels in Clinton CountyEPA zone 1
45.9%at or above 4 pCi/L
Median 3.5 pCi/L · 85 tests · 3.2 points below Howard County
- Radon levels in Cass CountyEPA zone 1
34.1%at or above 4 pCi/L
Median 2.6 pCi/L · 91 tests · 15.0 points below Howard County
Howard County, Cities and towns
Cities and towns in Howard County
Howard County's population has barely moved since 2020: 83,904 residents on July 1, 2025 against 83,589 then, by the Census Bureau's estimates. That works out to 286 people per square mile of land. Kokomo alone is home to 59,999 of them, 71.5% of the total. Together its 3 incorporated places hold 75.9% of those residents; the other 24.1% live outside any of them. Reported testing is thin here: 216 tests over 2008 to 2017, or 2.6 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.
From Kokomo to Russiaville, CDC publishes no figure by town: each reads Howard County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Kokomo | 59,999 | +0.7% | 71.5% |
| Greentown | 2,366 | −1.1% | 2.8% |
| Russiaville | 1,312 | −0.5% | 1.6% |
3 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).
Howard County, Homes
Homes in Howard County
Howard County is a place of houses on their own lots: 76% of its 39,795 homes are detached single-family houses, against 73% across Indiana. The homes are older than Indiana's as a whole: half were built before 1968 (1976 for Indiana), and 38% date from before 1960. 72% 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 | Howard County | Indiana |
|---|---|---|
| Housing units | 39,795 | 2,953,344 |
| Detached houses | 76% | 73% |
| In buildings of 5 or more | 12% | 13% |
| Mobile homes | 3% | 4% |
| Built before 1960 | 38% | 32% |
| Built since 2000 | 13% | 21% |
| Middle year built | 1968 | 1976 |
| Owner-occupied | 72% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.