What is the purpose of testing air for radon before testing water?

Testing air for radon before testing water is important for several reasons that encompass the overall safety of the home, identifying potential radon sources, and assessing the need for further testing.

When radon is detected in the air, it often indicates that there may be a significant risk of exposure, which is critical for evaluating the overall safety of the indoor environment. Airborne radon levels can directly impact health, as radon is a known carcinogen linked to lung cancer.

Furthermore, testing the air helps to pinpoint potential sources of radon in the home. Radon typically emanates from soil and rock beneath a building; hence, elevated levels in the air can prompt an investigation into the pathways through which radon might be entering the structure.

Lastly, assessing air quality is an essential preliminary measure, as it can influence whether subsequent water testing is necessary. If air tests reveal high radon levels, this can indicate that addressing air quality should take precedence before exploring water, as most radon comes from the air rather than the water supply in many areas.

By encompassing the evaluation of safety, identifying sources, and determining the need for additional testing, the choice reflects a comprehensive approach to radon assessment.