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Indoor Radon Program

Radon Test Results

The link below will open a PDF document which lists test kit data as supplied to the Department from the certified radon laboratory and testing community. The report will show you the radon levels found in homes near your area. However, radon levels can be different from house to house, even on the same street, so do not rely on the database to determine whether your home may have radon. CDPH recommends that all homeowners test for radon, regardless of your local zip code results.

Data includes all short-term test methods, and all house types. This data is provided for informational purposes only and is not suitable for statistical or geospatial analysis. For reference, the U.S. EPA has established their action level at 4.0 pCi/L, and they have estimated that the national average indoor radon concentration at 1.3 pCi/L.

California Radon Test Results (PDF)
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Indoor Radon Program

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