Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Moultrie County, Illinois
EPA puts Moultrie County in Zone 1, its highest radon zone, and high results are common there: 46.7% of the 45 radon tests reported to CDC (2017) 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
46.7%
13.0 pts above IL
- Moultrie
- 46.7%
- Illinois
- 33.7%
45 tests, 2017
Median result
3.3pCi/L
Below action level
- Moultrie
- 3.3 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2017
Tests reported
45
62nd of 70 by tests
- Moultrie
- 45
- Cook
- 26,937
Reported to CDC before any fix, 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Illinois
25 of 70
Middle half
- Moultrie
- 46.7%
- Stark
- 69.2%
By share, of 70 with 30+ tests
Read a result for Moultrie County
Starts at Moultrie County's median, 3.3 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.3 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. Moultrie County's median reported result, 2017.
The data
Moultrie County, At a glance
Moultrie County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Moultrie County in
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 Moultrie County, 2017
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.0% |
| 2015 | 16.7% |
| 2017 | 46.7% |
2017: 46.7%. Across these years the share ran from 16.7% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 45 tests reported to CDC for Moultrie County over 2017, 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: 2017. Measured data period: 2005 to 2017 (every CDC figure on file).
Moultrie County, Compared
Moultrie County radon figures, compared
Calculated by Radon411In Moultrie County, about 5 in 10 reported tests in 2017 (21 of 45) were at or above EPA's action level. Against the national pool of 31.7%, the gap is 15.0 points higher. Across 93 Illinois counties pooled together, 33.7% of tests reached that level, so Moultrie County runs 13.0 points above its state.
Of 4 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 38.8% (Macon County) to 54.8% (Piatt County). By share, Moultrie County is 25th of 70 Illinois counties with 30 or more tests for the same period.
Year by year, 2014 opened at 50.0% and 2017 closed at 46.7% (down 3.3 points), with 2014 the high at 50.0%. Half the tests came in under 3.3 pCi/L and half over it; the single highest reached 12.0 pCi/L. Below the action level, 12 tests (26.7%) came in under 2 pCi/L, against 37.7% statewide, and 12 tests (26.7%) fell between 2 and 4, against 28.6% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 46.7% share point the same way here. USGS geology rates 100% of the county's land high radon potential.
The busiest year on file was 2017, with 45 tests reported; the quietest, 2015, had 36.
Moultrie CountyIllinois, pooled
46.7% % of tests33.7% % of tests
| Year | Tests | Moultrie County, at or above 4 pCi/L | Illinois, pooled |
|---|---|---|---|
| 2014 | 36 | 50.0% | 37.8% |
| 2015 | 36 | 16.7% | 36.6% |
| 2017 | 45 | 46.7% | 33.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Moultrie County, Geology
The ground under Moultrie County
PredictedUSGS's geologic map puts all of Moultrie County's mapped land in one class: high radon potential. All of it lies in the area the map calls Bloomington Ridged Plain, 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 |
|---|---|---|---|---|
| Bloomington Ridged Plain | Wisconsinan glacial deposits and loess over Paleozoic 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.
Moultrie County beside the ground around it
Moultrie County has more high-potential ground than Illinois as a whole: 100% of its land against 64.5%. Of the 5 counties that border it, none has as large a share of high-potential ground; Douglas County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Moultrie County, Local resources
Radon testing and mitigation in Moultrie County
Listed radon businesses with an address in Moultrie 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.
Listed radon professionals by town: Sullivan
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
Moultrie County, Questions
Questions about radon in Moultrie County
Are radon levels high in Moultrie County?
In 2017, 46.7% of the radon tests reported to CDC for Moultrie County, Illinois were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 70 Illinois counties with 30 or more tests for the same period, 24 reported a higher share; pooled, the state comes to 33.7%.
Which counties border Moultrie County?
Moultrie County borders 5 counties: Shelby County, Coles County, Douglas County, Piatt County and Macon County.
Products
Moultrie County, Products
Testing a home in Moultrie County
In Moultrie County, 46.7% of 45 tests reported to CDC in 2017 reached 4 pCi/L, against 33.7% pooled across Illinois. In Zone 1 the year-round level in Moultrie 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
Monitor
RadonScan-Plus USB-powered radon monitor with Wi-Fi
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Moultrie County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Moultrie County
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Moultrie County, Bordering counties
Counties bordering Moultrie County
Calculated by Radon411- Radon levels in Shelby CountyEPA zone 2
71.4%at or above 4 pCi/L
Median 5.2 pCi/L · 21 tests · 24.7 points above Moultrie County
- Radon levels in Piatt CountyEPA zone 1
54.8%at or above 4 pCi/L
Median 4.3 pCi/L · 279 tests · 8.1 points above Moultrie County
- Radon levels in Coles CountyEPA zone 1
51.5%at or above 4 pCi/L
Median 4.2 pCi/L · 198 tests · 4.8 points above Moultrie County
- Radon levels in Douglas CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 84 tests · 3.3 points above Moultrie County
- Radon levels in Macon CountyEPA zone 1
38.8%at or above 4 pCi/L
Median 3.1 pCi/L · 1,251 tests · 7.9 points below Moultrie County
Moultrie County, Cities and towns
Cities and towns in Moultrie County
About 14,371 people live in Moultrie County by the Census Bureau's estimate for July 1, 2025, 114 fewer than in 2020 (−0.8%). That works out to 43 people per square mile of land. Its largest town, Sullivan, has 4,310 residents, 30.0% of the total. Reported testing is thin here: 45 tests over 2017, or 3.1 for every 1,000 residents (2025 estimate), where Illinois as a whole comes to 10.9.
From Sullivan to Allenville, CDC publishes no figure by town: each reads Moultrie County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sullivan | 4,310 | −2.0% | 30.0% |
| Arthurextends beyond Moultrie County | 2,261 | +1.8% | Counted whole |
| Bethany | 1,200 | −4.0% | 8.4% |
| Lovington | 1,010 | −4.9% | 7.0% |
| Dalton City | 432 | −5.1% | 3.0% |
| Gays | 212 | −4.9% | 1.5% |
| Allenville | 129 | −3.7% | 0.9% |
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 Moultrie County is counted whole, so it has no share.
Moultrie County, Homes
Homes in Moultrie County
Moultrie County is a place of houses on their own lots: 85% of its 6,205 homes are detached single-family houses, against 58% across Illinois. Half of its homes were built before 1967, close to Illinois' 1970: 42% date from before 1960 and 16% from 2000 or later. Owners live in 77% of the occupied homes (Illinois: 67%), so for most households a test and a fix are their own to order.
| Homes | Moultrie County | Illinois |
|---|---|---|
| Housing units | 6,205 | 5,443,501 |
| Detached houses | 85% | 58% |
| In buildings of 5 or more | 6% | 22% |
| Mobile homes | 4% | 2% |
| Built before 1960 | 42% | 38% |
| Built since 2000 | 16% | 16% |
| Middle year built | 1967 | 1970 |
| Owner-occupied | 77% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.