Understanding Radon Test Results

A radon result helps homeowners decide whether mitigation should be discussed. Keystone uses existing results to prepare mitigation recommendations.

What pCi/L means

Radon in air is commonly reported in picocuries per liter, abbreviated pCi/L. The number represents the concentration of radon measured during the test period.

The EPA recommends fixing homes with radon levels of 4 pCi/L or higher. EPA also states that there is no known safe level of radon exposure and recommends considering reduction for levels between 2 and 4 pCi/L.

A single test result reflects the conditions during that test
Weather, season, ventilation, closed-house conditions, and test placement can affect results
Short-term tests are useful for screening, while longer tests can give a broader exposure picture
Use an appropriate test method or qualified testing provider when a reliable measurement is needed

Radon mitigation monitoring equipment mounted to a pipe

When to discuss mitigation

If a result is above the recommended action level, mitigation should be discussed. Pennsylvania DEP advises homeowners with results above 4 pCi/L to confirm the result and take corrective action if results remain elevated.

Post-mitigation testing

A mitigation system indicator shows whether suction is present; it does not report the home's radon level. A post-mitigation test verifies whether indoor radon has been reduced.

How Keystone uses results

Keystone Radon Mitigation does not need to be the testing provider to plan mitigation. Homeowners can share an existing result, test date, property location, and foundation details when requesting an estimate.

What to keep with home records

Keep copies of radon test reports, the mitigation estimate, system information, and post-install results. These records are useful for future maintenance, retesting, resale, and conversations with qualified testing providers.

Sources:EPA radon action level guidance Pennsylvania DEP radon in the home guidance EPA radon retesting guidance

Have a radon result above the recommended action level?

Contact Keystone to discuss mitigation options for the property.