This new AWWA Research Foundation report is a complete and practical O&M manual for preventing water quality degradation in distribution systems. The researchers took an in-depth look at all the factors which create water quality problems in the distribution system. You will find the latest tools, techniques, and recommendations for: Identifying water quality problems originating in the distribution system; Developing operational and maintenance programs that will prevent and minimize water quality degradation in the distribution system; Identifying treatment plant operations that should be modified to improve distribution system water quality; Managing the distribution system for optimum water quality; Responding quickly to water quality problems. An interactive CD-ROM is provided, to illustrate with video and photos many case and field studies.