水库和湖泊的微生物质量因各种环境因素而波动，这些环境因素可能会改变自然自净过程，并导致不可逆转的生态变化。微生物采样项目的数据揭示了几个有助于保护水源水质和减少水处理问题的因素。在不同深度对水库中的粪便大肠菌群密度进行采样。包括76个参考文献、表格和图表。

The microbiological quality of reservoirs and lakes fluctuates as a result of a variety of environmental forces that may alter the natural self-purification process and lead to irreversible ecological changes. Data from microbiological sampling programs revealed several factors that could help protect source water quality and reduce water treatment problems. The fecal coliform density in the reservoir was sampled at various depths. Includes 76 references, tables, figures.