There is no “acceptable level” of radon. However, the EPA has established 4 picocuries per liter of air (pCi/L) as the United States “Action Level” at which a plan should be made to correct elevated radon levels.
Acceptable Level of Radon
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Keeping Radon out of Buildings
The best kind of radon is the radon that never enters a building.
Radon-resistant construction techniques are required by Iowa law for new school construction and should be discussed with architects during the planning stages of any building project.
How Radon Gets Indoors
No matter how old or new, every building has the potential for elevated levels of radon. Radon gas moves upward through cracks and other openings in the foundations of buildings from the soil below. Concentrations can vary based on source strength and soil permeability.