Skip to content
RADON411
$5

County radon report

Get it

Locations and reports

Radon in St. Charles, Illinois

St. Charles, Illinois spans 2 counties, DuPage County and Kane County. Radon data is published by county, so this page sets their figures side by side.

IllinoisAbout 33,594 people

What this means for you

  • Your area: St. Charles lies in 2 counties. EPA rates DuPage County Zone 2 and Kane County Zone 1, where Zone 1 is the highest of its three radon zones. Zones are predictions for whole counties, and homes with elevated levels occur in all three zones.
  • Local tests: For 2017, the share of radon tests reported to CDC that were at or above 4 pCi/L was 33.7% in DuPage County (19,401 tests) and 36.6% in Kane County (8,682 tests). EPA's action level is 4 pCi/L.
  • Your home: The only way to know your home’s level is to test it.
How to testFind a certified tester

pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.

St. Charles, What is published

What is published for St. Charles

Information:

Radon data is published by county, not by city

Radon data is published by county, not by city. EPA assigns radon zones to counties, and CDC publishes radon test figures by county. Neither publishes a figure for St. Charles, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.

Each county has its own CDC test figures, shown below side by side. About 33,594 people live in St. Charles.

St. Charles, Counties

St. Charles's counties, side by side

Measured

Each county's own EPA zone and its own published CDC figures for 2017, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.

  • DuPage County
    EPA zone
    Zone 2: Moderate predicted potential
    At or above 4 pCi/L
    33.7%
    Median result
    2.7 pCi/L
    Tests reported
    19,401 tests
    Annual years on file
    4
  • Kane County
    EPA zone
    Zone 1: Highest predicted potential
    At or above 4 pCi/L
    36.6%
    Median result
    2.8 pCi/L
    Tests reported
    8,682 tests
    Annual years on file
    4
The counties St. Charles lies in, each with its own EPA zone and its own published CDC figures for 2017
CountyEPA zoneReported tests at or above 4 pCi/LMedian reported resultTests reportedAnnual years on file
DuPage CountyZone 2: Moderate predicted potential33.7%2.7 pCi/L19,401 tests4
Kane CountyZone 1: Highest predicted potential36.6%2.8 pCi/L8,682 tests4

The median reported pre-mitigation result for 2017 was 2.7 pCi/L in DuPage County and 2.8 pCi/L in Kane County.

CDC counts radon tests that were reported to it, not homes, and figures from few tests can swing widely from year to year. Each county’s report has its full history.

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2017.

St. Charles, Local resources

Local resources for St. Charles

Who to ask in Illinois: the state's radon program, test kits and professionals.

IEMA-OHS Radon Program

Illinois Emergency Management Agency and Office of Homeland Security

Illinois’s radon program answers questions about testing, mitigation and the rules where you live.

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.
Visit the program's page(opens in a new tab)

Test kits

Ask the program whether it has free or discounted kits, or compare kits you can buy.

Free and low-cost kitsCompare kits

Radon professionals

Radon testers and mitigators in Illinois, each with how its listing was checked.

Professionals in Illinois

St. Charles, Questions

Questions about radon in St. Charles

What radon zone is St. Charles in?

EPA's Map of Radon Zones classifies counties, not cities. Kane County is in Zone 1 (highest predicted potential); DuPage County is in Zone 2 (moderate predicted potential). The counties St. Charles lies in do not share one zone, so no single zone is given for St. Charles. A zone is a prediction for a whole county and never tells you the level in one home.

How many radon tests come back high in St. Charles's counties?

For 2017, the share of radon tests reported to CDC that were at or above 4 pCi/L was 33.7% in DuPage County (19,401 tests) and 36.6% in Kane County (8,682 tests). Each is that county's own figure, counting tests reported to CDC, not homes. Radon411 does not average or combine them into a figure for the city.

Should I test my home in St. Charles?

Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.

The answers use the published figures of DuPage County and Kane County, the counties St. Charles lies in.

St. Charles, Keep reading

Keep reading

St. Charles / Next steps

What to do next