Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Jasper County, Illinois
EPA puts Jasper County in Zone 2, its middle radon zone, and only 6 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
Share at 4+ pCi/L
23.7%
19.4 pts below IL
- Jasper
- 23.7%
- Illinois
- 43.1%
76 tests, 2008 to 2017
Median result
1.9pCi/L
Below action level
- Jasper
- 1.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
76
79th of 93 by tests
- Jasper
- 76
- Cook
- 14,199
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Illinois
77 of 93
Lowest quarter
- Jasper
- 23.7%
- Stark
- 80.5%
By share, of 93 with 30+ tests
Read a result for Jasper County
Starts at Jasper County's median, 1.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.9 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Jasper County's median reported result, 2008 to 2017.
The data
Jasper County, At a glance
Jasper County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Jasper County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Jasper County, 2017
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.0% |
| 2017 | 50.0% |
2017: 50.0%. Across these years the share ran from 50.0% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 6 tests were reported to CDC for Jasper 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).
Jasper County, Compared
Jasper County radon figures, compared
Calculated by Radon411Jasper County's 76 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.9 pCi/L and a maximum of 25.3 pCi/L, and 23.7% reached 4 pCi/L. Illinois as a whole (102 Illinois counties, pooled) comes to 43.1%: 19.4 points higher than here.
The newest figure, in 2017, counts only 6 tests (50.0% at or above 4 pCi/L), too few to compare, so this reading uses the 76-test figure.
Among its state's counties it ranks 77th of 93 Illinois counties with 30 or more tests for the same period. Statewide for the same period, Stark County reported the highest share (80.5%) and Williamson County the lowest (13.3%).
Below the action level, 42 tests (55.3%) came in under 2 pCi/L, against 31.6% statewide, and 16 tests (21.1%) fell between 2 and 4, against 25.3% statewide. The busiest year on file was 2014, with 12 tests reported; the quietest, 2017, had 6.
EPA's 1993 zone map puts Jasper County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Next door, the shares run from 14.7% in Clay County to 37.9% in Effingham County, with Clark County, Cumberland County and Crawford County below Jasper County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Jasper County, Geology
The ground under Jasper County
PredictedUSGS's geologic map puts all of Jasper County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Southern Central Lowland Province, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Southern Central Lowland Province | Illinoian glacial deposits, sandstone, and gray shale. | Moderate | 9 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Jasper County beside the ground around it
Across Illinois 64.5% of the land is rated high; none of Jasper County's is. Of the 6 counties that border it, 2 have more high-potential ground, Cumberland County the most at 5.3%.
The map rates the ground, not the air in any home.
Local help
Jasper County, Local resources
Radon testing and mitigation in Jasper County
- IEMA-OHS Radon ProgramIEMA-OHS Radon Program, run by Illinois Emergency Management Agency and Office of Homeland Security, licenses or certifies radon professionals and states the rule for disclosing radon when a home is sold, and answers questions about testing and mitigation in Illinois.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Illinois339 professionals are listed in Illinois.
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
Jasper County, Questions
Questions about radon in Jasper County
Are radon levels high in Jasper County?
In 2017, 50.0% of the radon tests reported to CDC for Jasper County, Illinois were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.9 pCi/L. Of 93 Illinois counties with 30 or more tests for the same period, 76 reported a higher share; pooled, the state comes to 43.1%.
Which counties border Jasper County?
Jasper County borders 6 counties: Cumberland County, Crawford County, Effingham County, Richland County, Clay County and Clark County.
Products
Jasper County, Products
Testing a home in Jasper County
In Jasper County, 23.7% of 76 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 43.1% pooled across Illinois. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Jasper County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Jasper County, Bordering counties
Counties bordering Jasper County
Calculated by Radon411- Radon levels in Effingham CountyEPA zone 2
37.9%at or above 4 pCi/L
Median 3.0 pCi/L · 763 tests · 14.2 points above Jasper County
- Radon levels in Clark CountyEPA zone 2
22.1%at or above 4 pCi/L
Median 2.0 pCi/L · 77 tests · 1.6 points below Jasper County
- Radon levels in Cumberland CountyEPA zone 2
21.8%at or above 4 pCi/L
Median 1.8 pCi/L · 55 tests · 1.9 points below Jasper County
- Radon levels in Crawford CountyEPA zone 2
19.3%at or above 4 pCi/L
Median 1.8 pCi/L · 181 tests · 4.4 points below Jasper County
- Radon levels in Richland CountyEPA zone 2
18.9%at or above 4 pCi/L
Median 1.8 pCi/L · 148 tests · 4.8 points below Jasper County
- Radon levels in Clay CountyEPA zone 2
14.7%at or above 4 pCi/L
Median 1.1 pCi/L · 68 tests · 9.0 points below Jasper County
Jasper County, Cities and towns
Cities and towns in Jasper County
About 9,032 people live in Jasper County by the Census Bureau's estimate for July 1, 2025, 221 fewer than in 2020 (−2.4%). That works out to 18 people per square mile of land. Its largest town, Newton, has 2,715 residents, 30.1% of the total. Together its 7 incorporated places hold 38.3% of those residents; the other 61.7% live outside any of them. CDC's 76 reported tests for 2008 to 2017 work out to 8.4 per 1,000 residents (2025 estimate), close to Illinois' 8.6.
From Newton to Yale, CDC publishes no figure by town: each reads Jasper County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Newton | 2,715 | −2.1% | 30.1% |
| Ste. Marie | 226 | −3.0% | 2.5% |
| Willow Hill | 167 | −2.3% | 1.8% |
| Hidalgo | 107 | −1.8% | 1.2% |
| Wheeler | 96 | +2.1% | 1.1% |
| Rose Hill | 84 | −2.3% | 0.9% |
| Yale | 65 | −3.0% | 0.7% |
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).
Jasper County, Homes
Homes in Jasper County
Jasper County is a place of houses on their own lots: 87% of its 4,227 homes are detached single-family houses, against 58% across Illinois. Half of its homes were built before 1974, close to Illinois' 1970: 38% date from before 1960 and 22% from 2000 or later. Owners live in 83% of the occupied homes (Illinois: 67%), so for most households a test and a fix are their own to order.
| Homes | Jasper County | Illinois |
|---|---|---|
| Housing units | 4,227 | 5,443,501 |
| Detached houses | 87% | 58% |
| In buildings of 5 or more | 3% | 22% |
| Mobile homes | 7% | 2% |
| Built before 1960 | 38% | 38% |
| Built since 2000 | 22% | 16% |
| Middle year built | 1974 | 1970 |
| Owner-occupied | 83% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.