What are major potential entry sources of radon into a home?

Radon is a naturally occurring radioactive gas that can enter homes from various sources, primarily through the ground. Understanding the major potential entry sources of radon is crucial for effective home safety.

Cracks in concrete floors serve as a pathway for radon to seep into homes from the underlying soil. These cracks can allow gas to flow freely into the living spaces, especially when there are differences in air pressure between the inside of the house and the ground outside.

Floor drains can also be entry points for radon. If these drains are not properly sealed or maintained, the radon gas from beneath the home can rise into the living area, increasing exposure levels for the occupants.

Drainage sumps, often found in basements, can collect water and sometimes create a vacuum effect that allows radon to be drawn into the home. If a sump is not properly sealed or ventilated, it can act as a direct conduit for radon from the ground.

Given these explanations, each of these elements contributes to the overall risk of radon infiltration. Therefore, the answer that encompasses all potential entry sources is correct, as it acknowledges that radon can enter homes through multiple pathways, highlighting the importance of testing for and mitigating radon in any residential environment.