从水离开处理厂到到达用户水龙头之间，水质会发生重大变化，因此选择能够充分监测这些变化的监测站非常重要。但是，由于《安全饮用水法案》没有统一的监测时间表或框架，监测要求的可变性程度对最终负责实施这些法规的州和水系统构成了管理和技术障碍。这里提供了定位监测站的系统和定量指南。通过使用路径的概念，作者应用了覆盖率的概念，并从下游节点的质量推断出上游节点的质量。 包括7个参考文献、表格、图表。

Water undergoes substantial changes in quality between the time it leaves the treatment plant and the time it reaches the customer's tap, making it important to select monitoring stations that will adequately monitor these changes. But because there is no uniform schedule or framework for monitoring under the Safe Drinking Water Act, the degree of variability among monitoring requirements poses both management and technical barriers to states and water systems ultimately responsible for implementation of the regulations. Systematic and quantitative guidelines are provided here for locating monitoring stations. By using the concept of pathways, the authors applied the concept of coverage and inferred the quality at an upstream node from the quality at a downstream node. Includes 7 references, tables, figures.