Upon testing a house with two side-by-side results of 3 pCi/L and 7.5 pCi/L, what should be done before sale?

When a home shows varying levels of radon concentration, such as 3 pCi/L and 7.5 pCi/L, conducting a re-test is crucial before making any decisions regarding mitigation or the safety of the property. Radon levels can fluctuate due to various factors, including seasonal changes, weather, and building occupancy. A re-test will provide more reliable data to determine whether the radon levels are consistently above the recommended action level of 4 pCi/L.

Testing at different times can help ascertain the true radon concentration in the home and ensure that any mitigation actions taken are based on accurate readings. This is especially important in a real estate transaction, where sellers and buyers need to understand the health implications associated with radon exposure. Therefore, re-testing helps to confirm the situation and guides appropriate action if needed, ensuring that stakeholders make informed decisions regarding the property's safety.