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Radon Levels in Tippecanoe County, Indiana

EPA puts Tippecanoe County in Zone 1, its highest radon zone, and 36.8% of its 1,218 reported radon tests (2008 to 2017, laboratory totals) were 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    36.8%

    2.1 pts below IN

    Tippecanoe
    36.8%
    Indiana
    38.9%

    1,218 tests, 2008 to 2017

  • Median result

    2.7pCi/L

    Below action level

    Tippecanoe
    2.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,218

    10th of 69 by tests

    Tippecanoe
    1,218
    St. Joseph
    7,346

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Indiana

    48 of 69

    Middle half

    Tippecanoe
    36.8%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Tippecanoe County

Starts at Tippecanoe County's median, 2.7 pCi/L

2.7pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 2.7 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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. Tippecanoe County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Tippecanoe County, At a glance

Tippecanoe County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Tippecanoe County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

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 Tippecanoe County, 2008 to 2017, laboratory

Reported results by concentration band, Tippecanoe County, 2008 to 2017, laboratory
Under 2 pCi/L: 39%2 to 4 pCi/L: 24%4 pCi/L and above: 37%

Of 1,218 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Tippecanoe County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L47238.8%
2 to 4 pCi/L29824.5%
4 pCi/L and above44836.8%
What these figures count

These are the 1,218 tests reported to CDC for Tippecanoe 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).

How to read these figures

Tippecanoe County, Compared

Tippecanoe County radon figures, compared

Calculated by Radon411

In Tippecanoe County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (448 of 1,218) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.1 points higher. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Tippecanoe County runs 2.1 points below its state.

Of 6 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 35.7% (White County) to 61.8% (Benton County). By share, Tippecanoe County is 48th of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 62.0 pCi/L. Below the action level, 472 tests (38.8%) came in under 2 pCi/L, against 32.8% statewide, and 298 tests (24.5%) fell between 2 and 4, against 28.3% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 36.8% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 36 tests taken after mitigation in Tippecanoe County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Tippecanoe County went from 1,379 tests (2005 to 2014) to 1,218 (2008 to 2017), the share going from 35.7% to 36.8%.

Tippecanoe County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Tippecanoe County
Tippecanoe County1,21836.8%2.7 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled+2.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−1.1 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+26.5 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−22.7 points
Benton County, INborders it3461.8%5.7 pCi/L+25.0 points
Carroll County, INborders it3860.5%5.8 pCi/L+23.7 points
Fountain County, INborders it6055.0%4.6 pCi/L+18.2 points
Clinton County, INborders it8545.9%3.5 pCi/L+9.1 points
Montgomery County, INborders it15241.4%2.9 pCi/L+4.6 points
White County, INborders it4235.7%2.7 pCi/L−1.1 points
Warren County, INborders it2733.3%3.5 pCi/L−3.5 points
Where Tippecanoe County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultTippecanoe County testsTippecanoe County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L47238.8%32.8%39.6%+6.0 points
2 to 4 pCi/L29824.5%28.3%24.7%−3.8 points
4 pCi/L and above44836.8%38.9%35.7%−2.1 points
Tippecanoe County ranked among the 69 Indiana counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Boone County43 of 6961439.7%3.0 pCi/L
Marshall County44 of 6938339.7%3.2 pCi/L
Johnson County45 of 6955639.4%2.9 pCi/L
Owen County46 of 6911039.1%2.8 pCi/L
Hamilton County47 of 693,47937.6%2.7 pCi/L
Tippecanoe County48 of 691,21836.8%2.7 pCi/L
White County49 of 694235.7%2.7 pCi/L
Lawrence County50 of 6926735.6%2.7 pCi/L
Posey County51 of 6921535.3%2.8 pCi/L
Ripley County52 of 696835.3%2.9 pCi/L
Jennings County53 of 695735.1%2.8 pCi/L
Tippecanoe County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 20171,21836.8%2.7 pCi/L62.0 pCi/L38.9%+0.5 points
2007 to 20161,30236.3%2.6 pCi/L62.0 pCi/L39.2%−0.3 points
2006 to 20151,34836.6%2.7 pCi/L62.0 pCi/L39.6%+0.9 points
2005 to 20141,37935.7%2.7 pCi/L62.0 pCi/L39.3%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Tippecanoe County, Geology

The ground under Tippecanoe County

Predicted

USGS's geologic map puts all of Tippecanoe 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).

USGS's geologic areas under Tippecanoe County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Huron-Erie LobeCalcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks.High13100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Tippecanoe County beside the ground around it

Tippecanoe 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; Benton County comes nearest at 100%.

Share of land by USGS radon potential: Tippecanoe County, the 7 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Tippecanoe CountyZone 1NoneNone100%
Carroll CountyZone 1NoneNone100%
Montgomery CountyZone 1None5.9%94.1%
Clinton CountyZone 1NoneNone100%
Fountain CountyZone 1None5.0%95.0%
White CountyZone 1None0.7%99.3%
Benton CountyZone 1NoneNone100%
Warren CountyZone 1NoneNone100%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

The map rates the ground, not the air in any home.

Local help

Tippecanoe County, Local resources

Radon testing and mitigation in Tippecanoe County

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

Tippecanoe County, Questions

Questions about radon in Tippecanoe County

Are radon levels high in Tippecanoe County?

Over the 2008 to 2017 laboratory totals, 36.8% of the radon tests reported to CDC for Tippecanoe County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 47 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Tippecanoe County?

Tippecanoe County borders 7 counties: Carroll County, Montgomery County, Clinton County, Fountain County, White County, Benton County and Warren County.

Products

Tippecanoe County, Products

Testing a home in Tippecanoe County

In Tippecanoe County, 36.8% of 1,218 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 Tippecanoe 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

Tippecanoe County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Tippecanoe County

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Tippecanoe County, Bordering counties

Counties bordering Tippecanoe County

Calculated by Radon411

Tippecanoe County, Cities and towns

Cities and towns in Tippecanoe County

The Census Bureau estimates 190,456 residents in Tippecanoe County for July 1, 2025, 4,073 more than in 2020 (+2.2%). That works out to 382 people per square mile of land. Its largest town, Lafayette, has 71,238 residents, 37.4% of the total. CDC's 1,218 reported tests for 2008 to 2017 work out to 6.4 per 1,000 residents (2025 estimate), close to Indiana's 6.2.

From Lafayette to Clarks Hill, CDC publishes no figure by town: each reads Tippecanoe County's.

The cities and towns in Tippecanoe County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Lafayette71,238+0.7%37.4%
West Lafayette45,747+2.4%24.0%
Battle Ground1,905+3.3%1.0%
Shadeland1,841+4.4%1.0%
Dayton1,368+3.0%0.7%
Otterbeinextends beyond Tippecanoe County1,139−0.3%Counted whole
Clarks Hill621+4.0%0.3%

7 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 Tippecanoe County is counted whole, so it has no share.

Tippecanoe County, Homes

Homes in Tippecanoe County

Of Tippecanoe County's 79,327 homes, 59% are detached houses, against 73% across Indiana; 27% are in buildings of five or more homes. Much of Tippecanoe County is recent building: 31% of its homes have gone up since 2000 and the middle year built is 1986, against 1976 for Indiana. 54% 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 in Tippecanoe County, Indiana, 2019 to 2023
HomesTippecanoe CountyIndiana
Housing units79,3272,953,344
Detached houses59%73%
In buildings of 5 or more27%13%
Mobile homes3%4%
Built before 196025%32%
Built since 200031%21%
Middle year built19861976
Owner-occupied54%70%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.