When does the EPA suggest fixing a home based on a short-term test result?

The EPA's guidelines indicate that immediate action should be taken to fix a home if a short-term radon test reveals results above 4 pCi/L. This threshold is based on health-risk assessments, as higher levels of radon exposure are associated with an increased risk of lung cancer over time. A short-term test, which typically lasts from 2 to 90 days, can provide an initial indication of radon levels within a home. If those levels exceed 4 pCi/L, it is prudent for homeowners to consider mitigation measures to reduce radon concentration, as this is a recognized action threshold that addresses potential health risks effectively.

Long-term testing or waiting for specific seasons are not necessary prerequisites for taking action, highlighting the urgency of the situation when short-term tests indicate elevated radon levels. Therefore, the recommendation to fix the home based on a reading above this threshold is essential for ensuring occupant safety.