If the indoor radon level is high, what additional testing should be completed?

When indoor radon levels are found to be high, testing water sources becomes essential, especially if the household relies on well water or any groundwater supply. Radon is not only a concern in the air but can also be present in drinking water. Testing the water helps to identify if radon is being introduced into the home through water sources, which can occur with activities such as showering or washing dishes.

Performing a water test is crucial for a comprehensive assessment of radon exposure because it facilitates an understanding of the potential channels through which radon is entering the indoor environment. By determining the radon levels in the water, appropriate mitigation strategies can be developed to ensure safety for the occupants of the home.

Testing the soil and air could provide valuable information, but in the context of an already identified high indoor radon level, testing the water focuses on another potentially significant source of contamination. This step is particularly important since many homes may have elevated radon levels from both air and water sources, and addressing all potential pathways of radon is essential for complete risk management.