Locations and reports
Radon in St. Charles, Illinois
St. Charles lies in 2 counties, in EPA Zones 1 and 2. Homes with elevated levels occur in all three zones, so the only way to know your home's level is to test it.
Data checked By Radon411Methodology
- Predicted
- Zones 1 and 2across the 2 counties St. Charles lies in
- Measured
- By countyEach county's own CDC figures are set side by side below.
- Your home
- Test to knowNo area figure here is a reading of your home.
The data
St. Charles, What is published
What is published for St. Charles
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
MeasuredEach 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
| County | EPA zone | Reported tests at or above 4 pCi/L | Median reported result | Tests reported | Annual years on file |
|---|---|---|---|---|---|
| DuPage County | Zone 2: Moderate predicted potential | 33.7% | 2.7 pCi/L | 19,401 tests | 4 |
| Kane County | Zone 1: Highest predicted potential | 36.6% | 2.8 pCi/L | 8,682 tests | 4 |
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.
Radon Action Brief
National Radon Action MonthPre-sale
The radon brief for St. Charles, in one dated file.
- Your area's radon record, explained. EPA's zone and any CDC tests.
- Your plan to test this week. Which test, where it goes, how long.
- Fix costs and pros near you. Costs, EPA's checklist, listed pros.
Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25Sale ends January 31, then $25
Local help
St. Charles, Local resources
Local resources for St. Charles
Who to ask in Illinois: its radon program, test kits and professionals.
- IEMA-OHS Radon ProgramIllinois Emergency Management Agency and Office of Homeland SecurityIllinois’s radon program answers questions about testing, mitigation and the rules where you live.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 IllinoisRadon testers and mitigators in Illinois, each with how its listing was checked.
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
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.
Explore
St. Charles, Next steps
What to do next
What to do next: 1 of 4