The information on Radon Levels Guide is provided for general educational purposes only. It is not medical, legal or professional advice.
Area data is not your home’s radon level
County, ZIP code, city and regional figures are averages or classifications published by official agencies. Radon levels vary from house to house, even next door. The only way to know the radon level in your home is to test it.
Official reference levels
The U.S. EPA recommends fixing a home at or above 4 pCi/L (picocuries per liter) and considering a fix between 2 and 4 pCi/L. Health Canada recommends reducing radon when levels are above 200 Bq/m³ (becquerels per cubic meter). Always check the current guidance from the EPA, Health Canada or your state or provincial radon program.
Testing and mitigation
Follow the instructions of your test kit or device. Radon mitigation should be designed and installed by a certified professional (NRPP or NRSB in the U.S., C-NRPP in Canada). Cost figures on this site are typical ranges, not quotes.
Health
Long-term exposure to radon increases the risk of lung cancer. If you have health concerns, talk to your doctor.
Accuracy and updates
We take care to copy official data correctly and to date every page, but agencies update their data and errors can happen. Confirm important decisions with the original source. If you spot a mistake, please tell us.
Advertising and affiliate links
This site may display ads and may earn a commission when you buy through some links, at no extra cost to you.
No affiliation
We are not affiliated with the EPA, the CDC, Health Canada, any government agency or any radon company. Brand names belong to their owners.
Limitation of liability
Radon Levels Guide is not responsible for any loss or damage arising from the use of the information on this site. Use it at your own risk.