What’s the Radon Risk at My Address? – Check the EPA Zone
Enter any address and see your area’s EPA radon zone in seconds — whether you’re in a high-potential (Zone 1) area and if the EPA recommends testing your home. Free, instant, no phone calls, no signup.
Free Radon Zone Lookup
Enter any address – see your EPA radon zone instantly
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Enter your email to see your home’s full property risk — radon potential, storm & hail exposure, flood zone, and roof — with what each factor means and what to do, on the next screen.
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How it works
Enter an Address
Type any US property address into the form above.
We Look Up Your EPA Radon Zone
We read your state from the address and match it to the EPA Map of Radon Zones — the agency’s own predicted-potential classification — to find your radon zone.
See Your Zone & What It Means
Instantly see your radon zone (1, 2, or 3), whether it’s a high-potential area where the EPA recommends testing every home — plus your home’s full property risk.
Why your radon zone matters
Radon is a colorless, odorless radioactive gas that seeps up from the soil into homes — and it’s the second-leading cause of lung cancer in the US after smoking, and the leading cause among people who have never smoked (EPA/Surgeon General). Your EPA radon zone tells you how much radon potential your area carries, which is the first signal for whether you should test. This free tool matches your address to the EPA Map of Radon Zones in seconds — no phone calls and no signup.
How homeowners use their radon zone lookup
Know your area’s radon potential: See your EPA zone and whether it’s high-potential (Zone 1)
Decide whether to test: The EPA recommends testing every home — Zone 1 areas most urgently
Check before you buy: Radon is a common inspection item — know the area risk before closing
See your full picture: Pair radon with storm, flood, and roof risk for the whole property
Understanding EPA radon zones
- Zone 1 (highest potential): Predicted average indoor radon of 4 pCi/L or more — the EPA’s action level. Homes here should be tested; mitigation is common.
- Zone 2 (moderate potential): Predicted average between 2 and 4 pCi/L. Testing is still recommended — any individual home can read high.
- Zone 3 (lowest potential): Predicted average below 2 pCi/L. Lower area risk, but the EPA still recommends every home be tested at least once.
A note on accuracy
The EPA Map of Radon Zones predicts the average indoor radon for an area — it is a planning tool, not a measurement of your specific home. Radon varies house to house even on the same street, so a Zone 3 home can still test high and a Zone 1 home can test low. The only way to know your home’s actual level is a short-term radon test kit (widely available for $15–30). Confirm any real-estate or health decision with a measured test.
Your full property risk report also includes a FEMA flood-zone factor. This product uses the Federal Emergency Management Agency’s OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency’s website(s).
Frequently asked questions
How do I find the radon zone for my address?
Enter your address in the form above. We match it to the EPA Map of Radon Zones and instantly show your radon zone (1, 2, or 3), whether it’s a high-potential area, and what the EPA recommends. It’s free and takes seconds.
What do EPA radon zones 1, 2, and 3 mean?
The EPA groups areas by predicted average indoor radon. Zone 1 is highest potential (predicted average of 4 pCi/L or more — the EPA action level). Zone 2 is moderate (2 to 4 pCi/L). Zone 3 is lowest (below 2 pCi/L). It’s a prediction for the area, not a reading of your specific home.
Does a Zone 1 mean my home has high radon?
Not necessarily. Zone 1 means the area has high radon potential, but levels vary house to house even on the same street. A Zone 1 home can test low and a Zone 3 home can test high. The zone tells you how urgently to test; only a test tells you your home’s actual level.
Do I need to test my home for radon?
The EPA and the US Surgeon General recommend that every home be tested for radon, regardless of zone — and most urgently in Zone 1 areas. A short-term test kit costs about $15–30 and takes a few days. If a test reads 4 pCi/L or higher, the EPA recommends fixing the home; mitigation systems typically run $800–$1,500.
Is radon actually dangerous?
Yes. Radon is the second-leading cause of lung cancer in the US after smoking, and the leading cause among people who have never smoked, according to the EPA and the Surgeon General. It’s responsible for an estimated 21,000 lung-cancer deaths a year. The risk is manageable once you test and, if needed, mitigate.
Is this an official radon measurement?
No. This is a free lookup against the EPA’s public Map of Radon Zones — a predicted area classification, not a measurement of your home. The only way to know your home’s actual level is a physical radon test. Use this to decide whether and how urgently to test.
Is this really free?
Yes. The radon zone lookup is completely free — no credit card and no hidden fees. Enter your email to also get your home’s full property risk report (radon, storm, flood, and roof) at no cost; a deeper paid report is offered but never required.
How do I use BuildFolio’s free radon lookup?
Enter any US property address in the form above — no signup or account required. The tool matches your area to the EPA Map of Radon Zones and instantly shows your radon zone, whether it’s high-potential, and what the EPA recommends. Results appear in seconds.
Ready to check your radon zone?
Get your free EPA radon zone lookup by address — your zone, high-potential flag, and testing guidance — in seconds. No signup.
Check My Radon Zone