Alara Property Services
Indianapolis, IN
Listed for: Services not stated on the list
Licenses on file: see the profile
Locations and reports
Radon in Indianapolis, Indiana
EPA puts Marion County, where Indianapolis is, in Zone 1, its highest radon zone, and high results are common there: 40.1% of the 3,668 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
40.1%
1.2 pts above IN
- Marion
- 40.1%
- Indiana
- 38.9%
Marion, 42nd of 69 in IN, 2008 to 2017
Median result
3.1pCi/L
Below action level
- Marion
- 3.1 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Marion's tests, 2008 to 2017
Nearest county
41.5%
Hendricks, 19 miles
- Hendricks
- 41.5%
- Marion
- 40.1%
1,170 tests, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Marion, where Indianapolis is
Tests reported
3,668
In Marion
- Marion
- 3,668
- Hendricks
- 1,170
Reported to CDC before any fix, 2008 to 2017
Read a result for Indianapolis
Starts at Marion County's median, 3.1 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.1 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. Marion County's median reported result, 2008 to 2017.
The data
Indianapolis, What is published
What is published for Indianapolis
Information:
Every figure for Indianapolis is a county's
Radon data is published by county, not by city, so for Indianapolis it is Marion County's: its EPA zone (Zone 1) and the 3,668 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.
Indianapolis covers 362 square miles of land, all of it in Marion County. About 901,116 people live there, 2,492 to the square mile.
Indianapolis, Counties
The county Indianapolis lies in
MeasuredMarion County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.
Marion CountyZone 1Highest predicted potential
- 40.1%
- Reported tests at or above 4 pCi/L
- 3.1 pCi/L
- Median reported result
- 3,668 tests
- Tests reported to CDC
- None
- Yearly figures on file
Marion County ranks 42nd of 69 Indiana counties with 30 or more tests for that period, 1.2 points above the 38.9% pooled across Indiana's counties, 4.4 points above the national pool of 35.7%.
The counties nearest Indianapolis with a CDC figure for 2008 to 2017, laboratory, measured from the middle of the city: Hendricks County (19 miles, 41.5% of 1,170 tests), Johnson County (20 miles, 39.4% of 556 tests) and Hancock County (20 miles, 33.9% of 271 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 33.9% to 50.0%; the farthest of them, Madison County, is 35 miles away at 49.0%.
The directory lists 5 businesses with an address in Indianapolis, 1 for testing. Indiana's other cities with a page of their own: Bloomington, Fort Wayne and Valparaiso.
The counties around Indianapolis
By distance from the middle of Indianapolis; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Indianapolis, Geology
The ground under Indianapolis
PredictedUSGS's geologic map puts all of Indianapolis' 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.
Indianapolis beside its county and Indiana
All of Indianapolis, like all of Marion County, is rated high. Indianapolis has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%.
The map rates the ground, not the air in any home.
Indianapolis, Homes
Homes in Indianapolis
Of Indianapolis' 399,634 homes, 59% are detached houses, against 60% across Marion County; 23% are in buildings of five or more homes. Half of its homes were built before 1972, close to Marion County's 1972: 34% date from before 1960 and 17% from 2000 or later. 55% of occupied homes are lived in by their owner (Marion County: 56%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Indianapolis | Marion County | Indiana |
|---|---|---|---|
| Housing units | 399,634 | 439,034 | 2,953,344 |
| Detached houses | 59% | 60% | 73% |
| In buildings of 5 or more | 23% | 22% | 13% |
| Mobile homes | 1% | 2% | 4% |
| Built before 1960 | 34% | 34% | 32% |
| Built since 2000 | 17% | 17% | 21% |
| Middle year built | 1972 | 1972 | 1976 |
| Owner-occupied | 55% | 56% | 70% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Indianapolis, Professionals
Radon professionals listed in Indianapolis
Businesses whose listed city is Indianapolis, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Indianapolis: 1 of 5
5 listings with Indianapolis as the city. See radon testing in Indianapolis, or all radon professionals in Indiana.
Indianapolis, Local resources
Local resources for Indianapolis
Who to ask in Indiana: its radon program, test kits and professionals.
- Indiana's radon programIndiana Department of Health, phone 1-800-272-9723.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 Indiana5 listings cover Indianapolis.
The program's own words on licensing are on the Indiana page.
What it means
Indianapolis, Questions
Questions about radon in Indianapolis
What radon zone is Indianapolis in?
Indianapolis takes its zone from Marion County, which EPA puts in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in Indianapolis?
40.1% of the 3,668 tests reported from Marion County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home: high results are ordinary around Indianapolis. The median reported result was 3.1 pCi/L.
Should I test my home in Indianapolis?
Yes. About 1,471 of the 3,668 tests reported from Marion County were at or above 4 pCi/L. That is about what Indiana as a whole reports (38.9%), and ranks Marion County 42nd of the 69 Indiana counties with 30 or more tests. No map says which homes those are. How to test a home.
What ground is Indianapolis built on, as far as radon goes?
USGS's geologic map puts all of Indianapolis on one named area, "Huron-Erie Lobe", rated high for radon potential, radon index 13.
Is radon higher in the counties around Indianapolis?
Some are and some are not. Against Marion County's 40.1%, 4 of the 8 nearest counties with a figure report more and 4 less, from Hancock County (33.9%, 20 miles off) to Shelby County (50.0%, 26 miles off).
Who tests for or fixes radon in Indianapolis?
Radon411's directory has 5 businesses with an address in Indianapolis, all listed for testing, none for mitigation. Every entry names the public list it was taken from. Radon professionals in Indianapolis.
The answers use the published figures of Marion County, the county Indianapolis lies in.
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