Abstract: The radon removal system includes a reactor tank with a first inlet and spray head connected to the water supply for directing and spraying water into the tank. The tank is provided with an outlet at the base of the tank and a second inlet and spray head operatively coupled to the outlet through a pump for recycling and respraying the water in the reactor tank to purge the water of radon gas. A splash plate arrangement supported in the tank increases the spray effect by impingement and deflection of the water, breaking up the water droplets for release of radon gas. A ventilation arrangement with inlet and outlet spaced apart at the top of the tank vents the released radon gas away from the tank. A blower can be provided.