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 Vermilion County, Illinois
EPA puts Vermilion County in Zone 1, its highest radon zone, and high results are common there: 53.8% of the 39 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
53.8%
20.1 pts above IL
- Vermilion
- 53.8%
- Illinois
- 33.7%
39 tests, 2017
Median result
4.7pCi/L
Action level reached
- Vermilion
- 4.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2017
Tests reported
39
68th of 70 by tests
- Vermilion
- 39
- 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
15 of 70
Top quarter
- Vermilion
- 53.8%
- Stark
- 69.2%
By share, of 70 with 30+ tests
Read a result for Vermilion County
Starts at Vermilion County's median, 4.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.7 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Vermilion County's median reported result, 2017.
The data
Vermilion County, At a glance
Vermilion County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Vermilion 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 Vermilion County, 2017
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 47.1% |
| 2015 | 40.7% |
| 2017 | 53.8% |
2017: 53.8%. Across these years the share ran from 40.7% to 53.8%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 39 tests reported to CDC for Vermilion 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).
Vermilion County, Compared
Vermilion County radon figures, compared
Calculated by Radon411More than half: 53.8% of the 39 radon tests reported to CDC for Vermilion County in 2017 read at least 4 pCi/L. That places it 15th of 70 Illinois counties with 30 or more tests for the same period. That is 20.1 points above the 33.7% pooled from 93 Illinois counties.
The median result, 4.7 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 13.0 pCi/L. The rest split 15.4% under 2 pCi/L and 30.8% from 2 to 4 (Illinois: 37.7% and 28.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 53.8% share point the same way here.
1 of its 4 bordering counties with figures ran higher, led by Ford County at 57.1%; Iroquois County reported 25.0%. Statewide for the same period, Stark County reported the highest share (69.2%) and Williamson County the lowest (8.4%).
The busiest year on file was 2014, with 102 tests reported; the quietest, 2017, had 39.
Over 3 years of annual figures the share rose 6.7 points, from 47.1% in 2014 to 53.8% in 2017; its peak was 53.8% in 2017. Nationally, every county with a figure for the same period pools to 31.7%; Vermilion County sits 22.1 points above it.
Vermilion CountyIllinois, pooled
53.8% % of tests33.7% % of tests
| Year | Tests | Vermilion County, at or above 4 pCi/L | Illinois, pooled |
|---|---|---|---|
| 2014 | 102 | 47.1% | 37.8% |
| 2015 | 81 | 40.7% | 36.6% |
| 2017 | 39 | 53.8% | 33.7% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Vermilion County, Geology
The ground under Vermilion County
PredictedUSGS's geologic map puts all of Vermilion 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 | 99.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Vermilion County beside the ground around it
Vermilion County has more high-potential ground than Illinois as a whole: 100% of its land against 64.5%. Of the 8 counties that border it, none has as large a share of high-potential ground; Benton County, IN comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Vermilion County, Local resources
Radon testing and mitigation in Vermilion County
Listed radon businesses with an address in Vermilion 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: Oakwood
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
Vermilion County, Questions
Questions about radon in Vermilion County
Are radon levels high in Vermilion County?
In 2017, 53.8% of the radon tests reported to CDC for Vermilion County, Illinois were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.7 pCi/L. Of 70 Illinois counties with 30 or more tests for the same period, 14 reported a higher share; pooled, the state comes to 33.7%.
Which counties border Vermilion County?
Vermilion County borders 8 counties: Warren County, IN, Champaign County, IL, Vermillion County, IN, Edgar County, IL, Benton County, IN, Douglas County, IL, Iroquois County, IL and Ford County, IL.
Products
Vermilion County, Products
Testing a home in Vermilion County
In Vermilion County, 53.8% of 39 tests reported to CDC in 2017 reached 4 pCi/L, against 33.7% pooled across Illinois. In Zone 1 the year-round level in Vermilion 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
MonitorKidde
Radon Detector (RAB) battery digital radon detector with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Vermilion County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Vermilion County
Explore
Vermilion County, Bordering counties
Counties bordering Vermilion County
Calculated by Radon411- Radon levels in Edgar County, ILEPA zone 1
57.1%at or above 4 pCi/L
Median 4.5 pCi/L · 21 tests · 3.3 points above Vermilion County
- Radon levels in Ford County, ILEPA zone 1
57.1%at or above 4 pCi/L
Median 4.0 pCi/L · 42 tests · 3.3 points above Vermilion County
- Radon levels in Douglas County, ILEPA zone 1
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 84 tests · 3.8 points below Vermilion County
- Radon levels in Champaign County, ILEPA zone 1
44.7%at or above 4 pCi/L
Median 3.4 pCi/L · 3,159 tests · 9.1 points below Vermilion County
- Radon levels in Iroquois County, ILEPA zone 1
25.0%at or above 4 pCi/L
Median 1.9 pCi/L · 36 tests · 28.8 points below Vermilion County
- Radon levels in Warren County, INEPA zone 1
No CDC figure for 2017; its page reads it against its own neighbours.
- Radon levels in Vermillion County, INEPA zone 1
No CDC figure for 2017; its page reads it against its own neighbours.
- Radon levels in Benton County, INEPA zone 1
No CDC figure for 2017; its page reads it against its own neighbours.
Vermilion County, Cities and towns
Cities and towns in Vermilion County
About 71,259 people live in Vermilion County by the Census Bureau's estimate for July 1, 2025, 2,749 fewer than in 2020 (−3.7%). That works out to 79 people per square mile of land. Its largest town, Danville, has 28,138 residents, 39.5% of the total. Reported testing is thin here: 39 tests over 2017, or 0.5 for every 1,000 residents (2025 estimate), where Illinois as a whole comes to 10.9.
From Danville to Muncie, CDC publishes no figure by town: each reads Vermilion County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Danville | 28,138 | −3.4% | 39.5% |
| Hoopeston | 4,676 | −4.6% | 6.6% |
| Westville | 3,029 | −4.4% | 4.3% |
| Georgetown | 3,006 | −4.3% | 4.2% |
| Tilton | 2,537 | −4.0% | 3.6% |
| Catlin | 1,912 | −3.6% | 2.7% |
| Oakwood | 1,274 | −3.5% | 1.8% |
| Rossville | 1,170 | −4.5% | 1.6% |
| Ridge Farm | 752 | −4.3% | 1.1% |
| Potomac | 656 | −4.2% | 0.9% |
| Fairmount | 592 | −3.9% | 0.8% |
| Bismarck | 577 | −1.0% | 0.8% |
- Fithian
- Sidell
- Rankin
- Belgium
- Allerton (part)
- Indianola
- Alvin
- Henning
- Muncie
21 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).
Vermilion County, Homes
Homes in Vermilion County
Vermilion County is a place of houses on their own lots: 79% of its 34,390 homes are detached single-family houses, against 58% across Illinois. The homes are older than Illinois' as a whole: half were built before 1958 (1970 for Illinois), and 52% date from before 1960. 69% of occupied homes are lived in by their owner (Illinois: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Vermilion County | Illinois |
|---|---|---|
| Housing units | 34,390 | 5,443,501 |
| Detached houses | 79% | 58% |
| In buildings of 5 or more | 9% | 22% |
| Mobile homes | 6% | 2% |
| Built before 1960 | 52% | 38% |
| Built since 2000 | 7% | 16% |
| Middle year built | 1958 | 1970 |
| Owner-occupied | 69% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.