总水管维修期间的土壤侵入可能导致 易受污染的配电系统。 因为粪便指标并不总是存在 在水管附近的土壤和地下水中，它们不能 用于监视对分发系统的入侵 系统这项研究提供了支持使用的数据 利用需氧内孢子监测入侵和评估 配电系统维护实践。 需氧内生孢子自然存在于土壤中， 易于测量，并且比其他材料更耐氯 细菌指标。在怀疑低或低的情况下 分配系统的一部分出现负压， 需氧内孢子的测量可能有助于 评估缺乏压力的可能性 与潜在污染有关。有氧的 内孢子也符合理想微生物的标准 入侵的指示器，即 确认潜在的 受污染的水进入了分配系统 以及入侵的程度。包括52个参考文献、表格和图表。

Soil intrusion during water main repairs can render a distribution system vulnerable to contamination. Because fecal indicators are not always present in soil and groundwater near water mains, they cannot be used to monitor intrusion into the distribution system. This study provides data to support the use of aerobic endospores to monitor intrusion and evaluate distribution system maintenance practices. Aerobic endospores are naturally found in soil, easy to measure, and more resistant to chlorine than bacterial indicators. In the case of suspected low or negative pressure in a part of the distribution system, aerobic-endospore measurement could be useful in assessing the possibility that the lack of pressure was associated with potential contamination. Aerobic endospores also meet the criteria for an ideal microbial indicator of intrusion, namely the ability to confirm both the pathway by which potentially contaminated water entered the distribution system and the extent of the intrusion. Includes 52 references, tables, figures.