Test. Understanding Your Test Results.

To give you a better understanding of your radon test results, here are some reference points:

Nation-wide average indoor radon level: 1.3 pCi/L
Nation-wide average outdoor radon level: 0.4 pCi/L

EPA Action Level:      4.0 pCi/L

The EPA estimates that 1 in every 15 homes nationwide has radon levels at or above 4.0 pCi/L.  The U.S. Congress has set a long-term goal to reduce all indoor radon levels to 0.4 pCi/L (the average outdoor radon level) or below.

EPA's Recommended Testing Steps

Step 1. Conduct a short-term test. 

• Result ≥ 4.0 pCi/L - Conduct a second, follow-up test to confirm elevated radon levels (Step 2).

• Result ≤ 4.0 pCi/L - No actions to reduce indoor radon levels are required, although health risks exist below 4.0 pCi/L.  Be sure to re-test if your home every few years to ensure radon levels remain below 4.0 pCi/L.

Step 2. Conduct a second, follow-up test.

• If you need the results quickly (as in a real estate transaction), conduct a second short-term test.

• If time allows, conduct a long-term test (91 days - 1 year). Long-term tests account for seasonal and lifestyle variations.

Step 3. Fix your home.

• If you conducted a second short-term test, average the results of the first and second test.  Fix your home if the average is ≥ 4.0 pCi/L

• If your long-term test result is ≥ 4.0 pCi/L, fix your home.

Radon Health Risks

Health risks exist at all radon levels, so consider fixing your home even if your radon levels are below 4.0 pCi/L. Click here to learn more about the effects of radon exposure and help you better assess your family's health risk.

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Radon in Your Home's Indoor Air Our Testing Process
Radon in Granite Understanding Your Test Results
Radon in Water
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