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Radon Levels Explained

Most radon tests will have the results express in terms or picocuries which refers to the amount of radioactivity of radium in a liter of air.

* The US EPA action level for radon is 4 picocuries per liter of air (pCi/L), at which point mitigation to reduce radon levels is recommended. 4.0 pCi/L of radon is comparable to smoking 8 cigarettes per day.

* US EPA Citizen's Guide to Radon, 1986

Radon Cigarette Comparison 

The potential risk of getting lung cancer from prolonged radon exposure to 4 pCi/L is approximately 7 in 1,000.


The first step to help ensure the safety of you and your family’s health and safety is to have your home tested for radon. At St. Louis Radon, our professional testers deploy the latest in computerized electronic real-time radon monitoring technology to provide you with a comprehensive report, including a complete visual graph of radon level data points as recorded over a 48-hour sampling period.

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If testing indicates levels of radon that require action, our team of engineers and technicians will design and install a custom radon mitigation system to safely and effectively redirect radon and other soil gasses out of your home. We also take additional measures to seal and close other possible breaches in the foundation that could let soil gasses into the through cracks or drain tiles systems.

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New Construction

With new home construction projects, it is crucial to determine the level of radon that may be present in the soil before the home is built. It’s also critical to have the new home retested for potential radon concentrations immediately following occupancy. We also highly recommend installing an Active Dampness Control System (ADC) with every new build.

Learn More About New Construction