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Radon Levels in Pike County, Illinois

EPA puts Pike County in Zone 1, its highest radon zone, and only 12 radon tests from it are on file with CDC (2017). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    46.3%

    3.2 pts above IL

    Pike
    46.3%
    Illinois
    43.1%

    108 tests, 2008 to 2017

  • Median result

    3.8pCi/L

    Below action level

    Pike
    3.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    108

    70th of 93 by tests

    Pike
    108
    Cook
    14,199

    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 Illinois

    38 of 93

    Middle half

    Pike
    46.3%
    Stark
    80.5%

    By share, of 93 with 30+ tests

Read a result for Pike County

Starts at Pike County's median, 3.8 pCi/L

3.8pCi/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

  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. Pike County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Pike County, At a glance

Pike County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Pike 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 Pike County, 2017

Share of reported tests at or above 4 pCi/L, by year, Pike County
Share of reported tests at or above 4 pCi/L, by year, Pike County
YearShare of reported tests at or above 4 pCi/L
201428.6%
2015100.0%
201725.0%

2017: 25.0%. Across these years the share ran from 25.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 12 tests were reported to CDC for Pike County over 2017, 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: 2017. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Pike County, Compared

Pike County radon figures, compared

Calculated by Radon411

In Pike County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (50 of 108) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 10.6 points higher. Across 102 Illinois counties pooled together, 43.1% of tests reached that level, so Pike County runs 3.2 points above its state.

The newest figure, in 2017, counts only 12 tests (25.0% at or above 4 pCi/L), too few to compare, so this reading uses the 108-test figure.

Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 32.6% (Ralls County, MO) to 64.5% (Morgan County). By share, Pike County is 38th of 93 Illinois 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 48.8 pCi/L. Below the action level, 30 tests (27.8%) came in under 2 pCi/L, against 31.6% statewide, and 28 tests (25.9%) fell between 2 and 4, against 25.3% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 46.3% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 5 tests taken after mitigation in Pike County for the same period: tests in homes where a fix was already in.

The busiest year on file was 2014, with 42 tests reported; the quietest, 2015, had 3.

Pike County against Illinois, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Pike County
Pike County10846.3%3.8 pCi/LThis county
Illinois, pooled102 counties, pooled108,90943.1%Not pooled−3.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−10.6 points
Stark Countyhighest in the state8780.5%7.4 pCi/L+34.2 points
Williamson Countylowest in the state60113.3%1.3 pCi/L−33.0 points
Calhoun County, ILborders it666.7%4.5 pCi/L+20.4 points
Morgan County, ILborders it16964.5%5.8 pCi/L+18.2 points
Adams County, ILborders it3,67755.2%4.5 pCi/L+8.9 points
Scott County, ILborders it1250.0%4.4 pCi/L+3.7 points
Greene County, ILborders it2142.9%3.5 pCi/L−3.4 points
Marion County, MOborders it28241.8%3.2 pCi/L−4.5 points
Pike County, MOborders it3540.0%2.9 pCi/L−6.3 points
Brown County, ILborders it3737.8%2.9 pCi/L−8.5 points
Ralls County, MOborders it4332.6%2.7 pCi/L−13.7 points
Where Pike County's reported results fell, 2008 to 2017, laboratory, beside Illinois and the United States
ResultPike County testsPike County shareIllinois shareU.S. shareAgainst Illinois
Under 2 pCi/L3027.8%31.6%39.6%−3.8 points
2 to 4 pCi/L2825.9%25.3%24.7%+0.6 points
4 pCi/L and above5046.3%43.1%35.7%+3.2 points
Pike County ranked among the 93 Illinois 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 County33 of 9329748.1%3.6 pCi/L
Moultrie County34 of 936947.8%3.8 pCi/L
Whiteside County35 of 9364147.0%3.7 pCi/L
Kendall County36 of 931,12846.9%3.6 pCi/L
Christian County37 of 9323146.3%3.7 pCi/L
Pike County38 of 9310846.3%3.8 pCi/L
DeKalb County39 of 931,90246.2%3.6 pCi/L
Macon County40 of 9374444.5%3.4 pCi/L
St. Clair County41 of 932,77144.2%3.5 pCi/L
Winnebago County42 of 931,54944.2%3.4 pCi/L
Bond County43 of 938644.2%3.3 pCi/L
Pike County radon tests by year, against Illinois' pooled share
YearTestsAt or above 4 pCi/LMedianHighestIllinois, pooledChange from the row before
20171225.0%2.8 pCi/L6.2 pCi/L33.7%−75.0 points
20153100.0%6.1 pCi/L6.1 pCi/L36.6%+71.4 points
20144228.6%1.8 pCi/L4.4 pCi/L37.8%First on file

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

Pike County, Geology

The ground under Pike County

Predicted

Most of the ground under Pike County is one class on USGS's geologic map: 99.9% of its land is high radon potential, with 0.1% moderate. All of it lies in the area the map calls Galesburg Plain, to which USGS gives a radon index of 13, in the high band (12 to 17).

USGS's geologic areas under Pike County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Galesburg PlainIllinoian glacial deposits and loess over Paleozoic sedimentary rocks.High1399.9%

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

Pike County beside the ground around it

Pike County has more high-potential ground than Illinois as a whole: 99.9% of its land against 64.5%. Of the 9 counties that border it, 5 have more high-potential ground, Brown County the most at 100%.

Share of land by USGS radon potential: Pike County, the 9 counties bordering it and Illinois
AreaEPA zoneLow potentialModerate potentialHigh potential
Pike CountyZone 1None0.1%99.9%
Pike County, MOZone 2None95.6%4.4%
Scott CountyZone 1NoneNone100%
Brown CountyZone 1NoneNone100%
Adams CountyZone 1None0.1%99.9%
Ralls County, MOZone 2None100%None
Greene CountyZone 1NoneNone100%
Calhoun CountyZone 1None0.6%99.4%
Marion County, MOZone 2None98.5%1.5%
Morgan CountyZone 1NoneNone100%
Illinois102 counties, pooled by land areaVaries0.9%34.5%64.5%

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

Local help

Pike County, Local resources

Radon testing and mitigation in Pike County

What Illinois's program says
Phone
(800) 325-1245
Licensing of radon professionals
The Agency also licenses and regulates the individuals who provide radon measurement and mitigation to the public.
Disclosure when a home is sold or rented
Illinois Radon Awareness Act - This is the legislation that requires the seller to provide to the buyer of any interest in residential real property the IEMA-OHS pamphlet entitled "Radon Testing Guidelines for Real Estate Transactions" and the Illinois Disclosure of Information on Radon Hazards.

What it means

Pike County, Questions

Questions about radon in Pike County

Are radon levels high in Pike County?

In 2017, 25.0% of the radon tests reported to CDC for Pike County, Illinois were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 93 Illinois counties with 30 or more tests for the same period, 37 reported a higher share; pooled, the state comes to 43.1%.

Which counties border Pike County?

Pike County borders 9 counties: Pike County, MO, Scott County, IL, Brown County, IL, Adams County, IL, Ralls County, MO, Greene County, IL, Calhoun County, IL, Marion County, MO and Morgan County, IL.

Products

Pike County, Products

Testing a home in Pike County

In Pike County, 46.3% of 108 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.1% pooled across Illinois. In Zone 1 the year-round level in Pike 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

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

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Pike County, Bordering counties

Counties bordering Pike County

Calculated by Radon411

Pike County, Cities and towns

Cities and towns in Pike County

About 14,231 people live in Pike County by the Census Bureau's estimate for July 1, 2025, 404 fewer than in 2020 (−2.8%). That works out to 17 people per square mile of land. Its largest town, Pittsfield, has 4,041 residents, 28.4% of the total. CDC's 108 reported tests for 2008 to 2017 work out to 7.6 per 1,000 residents (2025 estimate), close to Illinois' 8.6.

From Pittsfield to Time, CDC publishes no figure by town: each reads Pike County's.

The 12 largest cities and towns in Pike County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Pittsfield4,041−3.1%28.4%
Barry1,247−3.6%8.8%
Griggsville1,047−4.0%7.4%
Pleasant Hill895−2.1%6.3%
Hull376−4.1%2.6%
New Canton325−2.4%2.3%
Perry302−3.2%2.1%
Nebo270−2.2%1.9%
Milton206−1.4%1.4%
Kinderhook188−1.6%1.3%
Baylis165−2.4%1.2%
New Salem116−3.3%0.8%
  • Pearl
  • Detroit
  • El Dara
  • Florence
  • Valley City
  • Time

18 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).

Pike County, Homes

Homes in Pike County

Pike County is a place of houses on their own lots: 84% of its 7,296 homes are detached single-family houses, against 58% across Illinois. The homes are older than Illinois' as a whole: half were built before 1960 (1970 for Illinois), and 50% date from before 1960. Owners live in 78% of the occupied homes (Illinois: 67%), so for most households a test and a fix are their own to order.

Homes in Pike County, Illinois, 2019 to 2023
HomesPike CountyIllinois
Housing units7,2965,443,501
Detached houses84%58%
In buildings of 5 or more2%22%
Mobile homes9%2%
Built before 196050%38%
Built since 200010%16%
Middle year built19601970
Owner-occupied78%67%

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