experts in risk communication must be an integral part of the planning and implementation team. The committee believes that the equity questions that are generated by the program of risk-trading could represent the most important barrier to the implementation of a cost-effective program that yields maximum public-health benefits.

EPA and the state agencies responsible for water quality will continue to be faced with the problem that the health risks arising from the presence of radon in drinking water are essentially associated with the water's contribution to the indoor air concentration. With an average transfer coefficient of 10-4, the increment of indoor radon that emanates from water will generally be smaller than the average concentration of radon already present in the dwellings from other sources. Thus, even if water treatment is required, the reduction of radon in water will not substantially reduce the total radon-related health risks that are faced by the occupants of the dwellings being served by the water utility.

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