拟议的消毒剂/消毒副产品（D/DBP）规则将卤乙酸（HAAs）的最大污染水平（MCL）设定为60 ug/L，并将三卤甲烷（THM）的MCL修改为80 ug/L。根据拟议的规则，研究人员从北卡罗来纳州的六家公用事业公司获得成品饮用水，并分析THMs、HAAs和总有机卤化物。在12个月的时间里，从分布系统内的代表性地点采集了三次样本，以识别DBP形成的季节模式。探讨了不同副产品之间的关系，以及它们与原水质量的关系。结果表明，HAA浓度可能比THM浓度高50%，成品饮用水中HAA的发生率可能比提出D/DBP规则时预期的要高得多。 包括19个参考文献、表格和图表。

The proposed Disinfectants/Disinfection By-Products (D/DBP) Rule establishes a maximum contaminant level (MCL) for haloacetic acids (HAAs) of 60 ug/L and revises the MCL for trihalomethanes (THMs) to 80 ug/L. In anticipation of the proposed rule, researchers obtained finished drinking water from six North Carolina utilities and analyzed for THMs, HAAs, and total organic halides. Samples from representative locations within the distribution system were collected three times over 12 months to discern seasonal patterns in DBP formation. Relationships among the different byproducts were explored, as was their relationship to raw water quality. The results suggest that HAA concentrations can be as much as 50 percent greater than THM concentrations and that the occurrence of HAAs in finished drinking water may be much higher than was anticipated when the D/DBP Rule was proposed. Includes 19 references, tables, figures.