本研究调查了16个饮酒的修复部位 水务署监察主要维修工程对公众健康的影响 水质。从分发区收集样本 系统和周围的土壤和地下水 电源。室外水质的变化 隔离的维修区域也受到了监控。 共收集了424个来自消费者的水样 对住宅和冲洗过的消防栓进行了检测 总大肠菌群、大肠杆菌和需氧菌 内孢子。在4.0%的患者中检测到总大肠菌群 这些样本和大肠杆菌只存在一个样本。 几乎所有阳性样本（17个样本中的16个）都已收集 在维修过程的冲洗步骤中。 水质变化，包括氯的损失 还观察到浊度的残余物和峰值 在维修区域外。 水管的维修是例行的 通过供水设施，以及 某些系统的维修费用可能相当高，因为 系统的老化和由此导致的恶化。 水务设施应采取适当措施 确保其操作实践充分 用于公共卫生保护和监管 顺从包括36个参考文献、表格、图表。

This study investigated 16 repair sites of drinking water mains to monitor the effect of main repairs on water quality. Samples were collected from the distribution system and from the soil and groundwater surrounding the mains. Changes in water quality outside the isolated repair area were also monitored. A total of 424 water samples collected from consumers' homes and flushed hydrants were assayed for total coliforms, Escherichia coli, and aerobic endospores. Total coliforms were detected in 4.0% of these samples and E. coli in only a single sample. Almost all of the positive samples (16 of 17) were collected during the flushing step of the repair process. Water quality changes, including losses of chlorine residuals and peaks in turbidity, were also observed outside the repair area. Repairs of water mains are routinely conducted by water utilities, and, moreover, the frequency of repairs in some systems can be quite high because of the system's age and resulting deterioration. Water utilities should have measures in place to ensure that their operational practices are adequate for public health protection as well as for regulatory compliance. Includes 36 references, tables, figures.