在大芝加哥大都会水回收区运营的一个废水处理设施的废水中遇到的总α和β放射性水平相对较高，促使对该地区的市政井水供应进行了放射性调查。研究发现，深度大于1200英尺（366米）的水井中的总α活性、总β活性和镭-226浓度高于深度小于850英尺（259米）的水井中的浓度。发现10口深井的水含有无法测量的氚浓度，但所有浅井的水含有0.3 nCi/L的氚。包括13份参考文献、表格和图表。

Relatively higher levels of total alpha and beta radioactivities encountered in wastewater of one of the wastewater treatment facilities operated by the Metropolitan Water Reclamation District of Greater Chicago prompted a radiological survey of the municipal well water supplies in the region. The concentrations of total alpha activity, total beta activity, and radium-226 were found to be higher in waters from wells with depths greater than 1,200 ft (366 m) than in waters from wells of less than 850 ft (259 m) depth. The waters from 10 of the deep wells were found to contain an unmeasurable concentration of tritium, but all of the shallow-well waters contained tritium at 0.3 nCi/L. Includes 13 references, tables, figures.