由于1979年11月对《国家初级饮用水暂行条例》进行了修订，许多公用事业公司面临着改变其消毒做法，以符合三卤甲烷（THM）的0.10 mg/L最高污染物水平。在考虑了各种方案后，印第安纳州埃文斯维尔的埃文斯维尔供水和下水道公用事业公司选择二氧化氯作为控制三卤甲烷最可行的方法。将采用二氧化氯处理的100 gpm（6.3 L/s）中试装置的性能与采用氯化处理的全尺寸装置的性能进行了比较。二氧化氯对减少三卤甲烷非常有效，自1983年以来，它已被埃文斯维尔的全尺寸工厂使用。包括19个参考、表格、数字。

Because of the November 1979 amendment to the National Interim Primary Drinking Water Regulations, many utilities were faced with changing their disinfection practices to comply with the 0.10 mg/L maximum contaminant level for trihalomethanes (THMs). After considering various options, one utility, the Evansville Water and Sewer Utility in Evansville, Indiana, chose chlorine dioxide as the most feasible method for controlling THMs. The performance of a 100 gpm (6.3-L/s) pilot plant that incorporated chlorine dioxide treatment was compared with that of a full-scale plant that used chlorination. Chlorine dioxide was so effective for reducing THMs that it has been used in Evansville's full-scale plant since 1983. Includes 19 reference, tables, figures.