讨论了美国环境保护署饮用水办公室对使用地下水源的成品水供应中挥发性有机化合物（VOCs）的采样和分析结果。测量了945个水源中29种挥发性有机化合物、5种三卤甲烷和总有机碳的浓度。除三卤甲烷外，最常见的五种化合物是三氯乙烯、1,1,1-三氯乙烷、四氯乙烯、顺式和/或反式-1,2-二氯乙烯和1,1-二氯乙烷。大约一半的样本是从随机的供水系统列表中采集的，这些系统被分为两组，一组服务于1万人以下，另一组服务于1万人以上。这些非随机样本取自各州选择的系统，使用的地下水来源可能会显示饮用水中的挥发性有机化合物。 随机样本中的大型系统与小型系统相比，VOC污染的发生频率明显更高，且污染水平也更高。包括7个参考文献、表格、图表。

The results of the US Environmental Protection Agency Office of Drinking Water sampling and analysis of volatile organic compounds (VOCs) in finished water supplies that use groundwater sources are discussed. Concentrations of 29 VOCs, five trihalomethanes, and total organic carbon in 945 water supplies were measured. The five most frequently found compounds other than trihalomethanes were trichloroethylene, 1,1,1-trichloroethane, tetrachloroethylene, cisand/or trans-1,2-dichloroethylene, and 1, 1-dichloroethane. Approximately half of the samples were taken from a random list of water systems, which were subdivided into two sets, those serving fewer than 10,000 people and those serving more than 10,000 people. The nonrandom samples were taken from systems selected by the states, using groundwater sources that were likely to show VOCs in drinking water. Large systems in the random sample had a significantly higher frequency of occurrence of VOC contamination than small systems and were also more likely to have higher levels of contamination. Includes 7 references, tables, figures.