Radon Action Level Calculator
Enter your radon test result to see EPA-aligned guidance on what it means and what to do next. Based on the EPA "A Citizen’s Guide to Radon."
This tool is for general guidance based on EPA thresholds and is not a substitute for professional testing or advice.
What Each Radon Level Means
| Result (pCi/L) | Status | EPA-aligned guidance |
|---|---|---|
| Less than 2.0 pCi/L | Low | Below the level where the EPA suggests considering action. Re-test about every two years, since levels can change. |
| 2.0 to 3.9 pCi/L | Consider mitigation | Below the 4.0 action level but elevated. The EPA notes you may wish to consider fixing the home, since there is no risk-free level. |
| 4.0 pCi/L and above | EPA action level | At or above the EPA action level. The EPA recommends fixing the home. Connect with a credentialed specialist for a mitigation quote. |
Source: US EPA, "A Citizen’s Guide to Radon." The action level is 4.0 pCi/L.
Remember that all 99 Iowa counties are EPA Radon Zone 1, and the Iowa state average is around 8.5 pCi/L per Iowa HHS, so elevated results are common here. Testing is the only way to know your home’s level.
Frequently Asked Questions
What is the EPA radon action level?
The EPA action level is 4.0 pCi/L. At or above that level, the EPA recommends taking steps to reduce radon in the home. Per the EPA Citizen’s Guide to Radon, homeowners may also consider fixing between 2.0 and 3.9 pCi/L.
Is any level of radon safe?
There is no completely risk-free level of radon, so lower is always better. The 4.0 pCi/L action level is the point at which the EPA recommends action, not a guarantee of safety below it.
My result is high. What now?
If your result is at or above 4.0 pCi/L, the recommended next step is mitigation. We can connect you with an NRPP-certified, Iowa HHS-credentialed specialist for a free quote.
Elevated Result? Get a Free Mitigation Quote
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