If the initial radon test result is 6.5, what should be done next?

When an initial radon test result indicates a level of 6.5 picocuries per liter (pCi/L), it is essential to confirm that measurement because this level is above the EPA action guideline of 4 pCi/L. The recommended next step is to conduct either a short-term test or a long-term test to verify the initial result.

Initiating a short-term test can quickly provide additional data about radon levels in the home, while a long-term test, which typically lasts more than 90 days, can yield a more accurate representation of average annual radon levels. Because radon levels can fluctuate significantly, obtaining further test results is necessary to understand the extent of radon exposure and whether intervention, such as radon mitigation, is required.

Delaying a short-term test, not taking any further action, or solely opting for a long-term test without a timely verification does not align with the recommendations for addressing elevated radon levels effectively. Immediate follow-up testing is critical to ensure the safety and health of the occupants.