1984年末，南加州大都会水区将其主要消毒剂改为氯胺，以确保其成员水务机构能够遵守0.10毫克/升三卤甲烷（THM）法规。随后的味觉和气味问题被确定为氯胺化的间接后果，氯胺氧化某些微生物释放的气味化合物的能力较弱。还研究了几种脱臭剂的存在和可能来源，以及各种处理技术对配水系统中THM水平的影响。 还研究了这些处理技术对配电系统中THM水平的影响。包括29个参考资料、表格、图表和照片。

In late 1984 the Metropolitan Water District of Southern California changed its primary disinfectant to chloramines to ensure that its member water agencies could comply with the 0.10-mg/L trihalomethane (THM) regulation. Subsequent taste and odor problems were determined to be an indirect consequence of chloramination, resulting from chloramines' lesser ability to oxidize odorous compounds released by certain microorganisms. The presence and possible sources of several off-odorants as well as various treatment techniques on THM levels in the distribution system are also examined. The effects of these treatment techniques on THM levels in the distribution system are also examined. Includes 29 references, tables, figures, photos.