Abstract: An apparatus for removing undesirable compounds such as radon, volatile organics, hydrogen sulfide, carbon dioxide and methane from contaminated well water which utilizes a recirculating system which is selectively operable to decrease the contamination of the treated water below a given level wherein the contaminant removal is achieved by providing an interface between the radon contaminated water and air in order to allow the undesirable compounds such as radon, volatile organics, hydrogen sulfide, carbon dioxide and methane to move from the water into the air due to the greater affinity therefore. The apparatus is designed to be used with a conventional residential or small commercial water well supply system and maximizes radon removal preferably by aspirating or baffling a gravity feed radon removal system for water which may include passing thereof through mass transfer packing material.