这项工作的总体目标是评估 从四家公用事业公司收集的监管监测数据中获得的铅和铜水平数据:费城 宾夕法尼亚州费城市水利部；底特律水和污水处理部门，密歇根州底特律 德克萨斯州沃思堡沃思堡市沃思堡水利部（DWSD）；还有波特兰水 局，俄勒冈州波特兰（普华永道）。这些公用事业公司已经收集了超过10年的监管合规性样本 使用铅和铜规则（LCR）要求的协议的年份。此外，还有另一种家用水龙头 PWD和DWSD收集的监测数据是AwwaRF项目铅和铜的一部分 对优化后的替代监测策略进行了评估。统计数据的比较 参数、频率分布的变化，以及随着时间的推移出现的高铅水平 介绍并讨论了实施腐蚀控制处理的公用设施。包括参考资料、表格、图表。

The overall objectives of this work were to evaluate summary statistics and frequency distributions for lead and copper level data from regulatory monitoring data collected at four utilities: the Philadelphia Water Department, Philadelphia, Pennsylvania (PWD); the Detroit Water and Sewerage Department, Detroit, Michigan (DWSD), the Fort Worth Water Department, Fort Worth, Texas (Fort Worth); and, the Portland Water Bureau, Portland, Oregon (PWB). These utilities have collected regulatory compliance samples for over 10 years using the protocol required in the Lead and Copper Rule (LCR). In addition, alternative home tap monitoring data collected at PWD and DWSD as part of the AwwaRF project entitled Lead and Copper Post-Optimization Alternative Monitoring Strategies was evaluated. Comparisons of statistical parameters, changes in frequency distributions, and the occurrence of high lead levels over time as these utilities implemented corrosion control treatment are presented and discussed. Includes reference, tables, figures.