AWWA JAW68260

Concerns about water quality and possible intentional contamination of water distribution systems are making online monitoring an increasingly important priority for many water utilities. The authors used a suite of modeling tools to develop a practical and defensible approach to detecting both security-related contamination events and natural water quality changes in drinking water distribution systems. The authors' conclusions demonstrate the value of using a modeling approach when monitoring locations are selected. These conclusions can help a utility develop a defensible approach to water quality monitoring in its distribution system. Use of a modeling approach to monitor location selection optimizes the use of utility dollars while maximizing public health protection. The presentation of actual on-line data is illustrative of the need to provide this type of monitoring to better understand both treatment and distribution system processes. Includes 14 references, tables, figures.