确定成品水库水质退化原因的关键包括常规水质监测、建立消毒剂残留和微生物成分的行动响应水平，以及尝试新方法和技术的意愿。本文对大都会水区的各种成品水库（固定盖、浮盖和无盖）进行了比较，并详细介绍了每个水库的独特监测要求和水质历史。

The keys to identifying the causes of water quality degradation in finished-water reservoirs include routine water quality monitoring, establishment of action response levels for disinfectant residuals and microbiological constituents, and a willingness to try new methods and technologies. This paper presents a comparison of the Metropolitan WAter District's various finished-water reservoirs (fixed-cover, floating-cover, and uncovered) and details the unique monitoring requirements and water quality history of each of these reservoirs.