Homeowner radon guide
Is 4 pCi/L of Radon Dangerous?
4 pCi/L is EPA's recommended action level, not a line separating safe from unsafe. EPA recommends reducing radon at 4 pCi/L or higher and suggests considering reduction between 2 and 4 pCi/L.
Interpret the test correctly
Check device placement, duration, building conditions, and follow-up guidance. A short-term result should be interpreted in the context of why and how the test was performed.
Take practical next steps
Confirm testing quality, follow EPA and state guidance, compare qualified mitigation options, and retest after mitigation. RadonCostGuide does not provide individualized medical advice.
What to do next
Use the cost estimator for planning or search for professionals whose recorded service area matches your ZIP code.
Content reviewed 2026-08-20. Educational information only; testing and a property-specific assessment are still required.