To remove radon, reduce radon, or get rid of radon is called radon mitigation or radon remediation. By far the most common radon mitigation technique is called active soil depressurization. The process involves suctioning the soil and radon gas from under the floor of the lowest level of a building. A fan sits outside the living area and is connected to a hole in the floor by PVC piping. The fan discharges radon gas above the roof edge. Sizable openings in the floor, such as cracks and sump pits, are sealed to ensure adequate suction.
Radon mitigation systems are permanent to the building and run 24/7. Typically, the goal is to reduce radon levels to below 4.0 picocuries per liter of air. The systems can vary in price from $1,100 to $6,000 each, with most systems in the $1,500 – $2,500 range.