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Radon Levels in Schuyler County, Illinois

EPA puts Schuyler County in Zone 1, its highest radon zone, and only 9 radon tests from it are on file with CDC (2015). 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

    57.1%

    13.4 pts above IL

    Schuyler
    57.1%
    Illinois
    43.7%

    49 tests, 2007 to 2016

  • Median result

    5.3pCi/L

    Action level reached

    Schuyler
    5.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2007 to 2016

  • Tests reported

    49

    84th of 92 by tests

    Schuyler
    49
    Cook
    13,699

    Reported to CDC before any fix, 2007 to 2016

  • 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

    19 of 92

    Top quarter

    Schuyler
    57.1%
    Stark
    79.4%

    By share, of 92 with 30+ tests

Read a result for Schuyler County

Starts at Schuyler County's median, 5.3 pCi/L

5.3pCi/L

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

EPA’s reading of 5.3 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Schuyler County's median reported result, 2007 to 2016.

Interpret this readingWhat a fix costs

The data

Schuyler County, At a glance

Schuyler County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Schuyler 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 Schuyler County, 2015

Share of reported tests at or above 4 pCi/L, by year, Schuyler County
Share of reported tests at or above 4 pCi/L, by year, Schuyler County
YearShare of reported tests at or above 4 pCi/L
201425.0%
20150.0%

2015: 0.0%. Across these years the share ran from 0.0% to 25.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 9 tests were reported to CDC for Schuyler County over 2015, 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: 2015. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Schuyler County, Compared

Schuyler County radon figures, compared

Calculated by Radon411

More than half: 57.1% of the 49 radon tests reported to CDC for Schuyler County over the 2007 to 2016 laboratory totals read at least 4 pCi/L. That places it 19th of 92 Illinois counties with 30 or more tests for the same period. That is 13.4 points above the 43.7% pooled from 102 Illinois counties.

The newest figure, in 2015, counts only 9 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 49-test figure.

The median result, 5.3 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 14.5 pCi/L. The rest split 12.2% under 2 pCi/L and 30.6% from 2 to 4 (Illinois: 31.2% and 25.1%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 57.1% share point the same way here.

1 of its 7 bordering counties with figures ran higher, led by Fulton County at 63.8%; Mason County reported 40.4%. Statewide for the same period, Stark County reported the highest share (79.4%) and Johnson County the lowest (12.2%).

The busiest year on file was 2014, with 24 tests reported; the quietest, 2015, had 9.

Nationally, every county with a figure for the same period pools to 35.8%; Schuyler County sits 21.3 points above it.

Schuyler County against Illinois, the United States and nearby counties, 2007 to 2016, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Schuyler County
Schuyler County4957.1%5.3 pCi/LThis county
Illinois, pooled102 counties, pooled105,29343.7%Not pooled−13.4 points
United States, pooled2,666 counties, pooled1,939,02535.8%Not pooled−21.3 points
Stark Countyhighest in the state6879.4%7.8 pCi/L+22.3 points
Johnson Countylowest in the state4912.2%1.8 pCi/L−44.9 points
Fulton County, ILborders it34863.8%5.0 pCi/L+6.7 points
Adams County, ILborders it3,26156.7%4.7 pCi/L−0.4 points
McDonough County, ILborders it73054.7%4.4 pCi/L−2.4 points
Hancock County, ILborders it16443.9%3.5 pCi/L−13.2 points
Cass County, ILborders it4942.9%3.3 pCi/L−14.2 points
Brown County, ILborders it3941.0%3.2 pCi/L−16.1 points
Mason County, ILborders it8940.4%3.4 pCi/L−16.7 points
Where Schuyler County's reported results fell, 2007 to 2016, laboratory, beside Illinois and the United States
ResultSchuyler County testsSchuyler County shareIllinois shareU.S. shareAgainst Illinois
Under 2 pCi/L612.2%31.2%39.6%−19.0 points
2 to 4 pCi/L1530.6%25.1%24.6%+5.5 points
4 pCi/L and above2857.1%43.7%35.8%+13.4 points
Schuyler County ranked among the 92 Illinois counties with 30 or more tests, by share at or above 4 pCi/L, 2007 to 2016, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Ogle County14 of 9273361.3%5.3 pCi/L
Henry County15 of 921,41061.2%5.1 pCi/L
Tazewell County16 of 924,68560.1%5.1 pCi/L
Jo Daviess County17 of 9298258.1%4.7 pCi/L
Bureau County18 of 9228557.2%4.4 pCi/L
Schuyler County19 of 924957.1%5.3 pCi/L
Adams County20 of 923,26156.7%4.7 pCi/L
McDonough County21 of 9273054.7%4.4 pCi/L
Putnam County22 of 926654.5%4.8 pCi/L
Shelby County23 of 9210354.4%4.4 pCi/L
Sangamon County24 of 923,17654.1%4.3 pCi/L
Schuyler County radon tests by year, against Illinois' pooled share
YearTestsAt or above 4 pCi/LMedianHighestIllinois, pooledChange from the row before
201590.0%2.9 pCi/L3.6 pCi/L36.6%−25.0 points
20142425.0%2.6 pCi/L7.6 pCi/L37.8%First on file

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

Schuyler County, Geology

The ground under Schuyler County

Predicted

USGS's geologic map puts all of Schuyler County's mapped land in one class: high radon potential. 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 Schuyler County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Galesburg PlainIllinoian glacial deposits and loess over Paleozoic 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.

Schuyler County beside the ground around it

Schuyler County has more high-potential ground than Illinois as a whole: 100% of its land against 64.5%. Of the 7 counties that border it, none has as large a share of high-potential ground; Brown County comes nearest at 100%.

Share of land by USGS radon potential: Schuyler County, the 7 counties bordering it and Illinois
AreaEPA zoneLow potentialModerate potentialHigh potential
Schuyler CountyZone 1NoneNone100%
Brown CountyZone 1NoneNone100%
Cass CountyZone 1NoneNone100%
McDonough CountyZone 1NoneNone100%
Adams CountyZone 1None0.1%99.9%
Fulton CountyZone 1NoneNone100%
Hancock CountyZone 1NoneNone100%
Mason 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

Schuyler County, Local resources

Radon testing and mitigation in Schuyler 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

Schuyler County, Questions

Questions about radon in Schuyler County

Are radon levels high in Schuyler County?

In 2015, 0.0% of the radon tests reported to CDC for Schuyler County, Illinois were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.9 pCi/L. Of 92 Illinois counties with 30 or more tests for the same period, 18 reported a higher share; pooled, the state comes to 43.7%.

Which counties border Schuyler County?

Schuyler County borders 7 counties: Brown County, Cass County, McDonough County, Adams County, Fulton County, Hancock County and Mason County.

Products

Schuyler County, Products

Testing a home in Schuyler County

In Schuyler County, 57.1% of 49 tests reported to CDC over the 2007 to 2016 laboratory totals reached 4 pCi/L, against 43.7% pooled across Illinois. In Zone 1 the year-round level in Schuyler 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

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

Explore

Schuyler County, Bordering counties

Counties bordering Schuyler County

Calculated by Radon411

Schuyler County, Cities and towns

Cities and towns in Schuyler County

About 6,657 people live in Schuyler County by the Census Bureau's estimate for July 1, 2025, 208 fewer than in 2020 (−3.0%). That works out to 15 people per square mile of land. Its largest town, Rushville, has 2,857 residents, 42.9% of the total. Together its 4 incorporated places hold 47.5% of those residents; the other 52.5% live outside any of them. CDC's 49 reported tests for 2007 to 2016 work out to 7.4 per 1,000 residents (2025 estimate), close to Illinois' 8.3.

From Rushville to Camden, CDC publishes no figure by town: each reads Schuyler County's.

The cities and towns in Schuyler County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Rushville2,857−3.5%42.9%
Littleton134−2.9%2.0%
Browning112−3.4%1.7%
Camden61−3.2%0.9%

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).

Schuyler County, Homes

Homes in Schuyler County

Schuyler County is a place of houses on their own lots: 80% of its 3,317 homes are detached single-family houses, against 58% across Illinois. Half of its homes were built before 1971, close to Illinois' 1970: 39% date from before 1960 and 15% from 2000 or later. Owners live in 80% of the occupied homes (Illinois: 67%), so for most households a test and a fix are their own to order.

Homes in Schuyler County, Illinois, 2019 to 2023
HomesSchuyler CountyIllinois
Housing units3,3175,443,501
Detached houses80%58%
In buildings of 5 or more3%22%
Mobile homes11%2%
Built before 196039%38%
Built since 200015%16%
Middle year built19711970
Owner-occupied80%67%

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