1980年末，密歇根州公共卫生部制定了一项常规的全州三卤甲烷监测计划。结果，在卡拉马祖市的部分配水系统和该市的一个井场发现了不可接受的四氯乙烯水平。钻探顺序测试井，以确定污染源，并绘制其在含水层中的移动。此外，还进行了土地利用研究和理论测压面研究。最初，污染最严重的两口生产井被用作净化井。实践证明，这种做法有助于保护油田的剩余部分，防止四氯乙烯进一步增加。因此，这种做法仍在继续。污染源被确定为一家废弃的干洗店。一个持续的监测项目跟踪污染物的进展。包括6个参考文献、表格、图表。

In late 1980 the Michigan Department of Public Health instituted a routine, statewide trihalomethane monitoring program. As a result, unacceptable levels of tetrachloroethylene were discovered in a portion of the city of Kalamazoo's water distribution system and in one of the city's well fields. Sequential test wells were drilled to identify the source of contamination and to plot its movement through the aquifer. In addition, a land-use study was conducted as well as a study of the theoretical piezometric surface. Initially, the two most contaminated production wells were used as purge wells. This practice proved beneficial in protecting the remainder of the well field from further increases in tetrachloroethylene. Therefore, the practice continues to be used. The source of the contamination was identified to be an abandoned dry cleaning business. An ongoing monitoring program tracks the progress of the contaminant. Includes 6 references, tables, figures.