Abstract
The objective of this paper is to review the state of the art knowledge in modeling water quality in distribution systems and to suggest future research needs in this area. Multiquality water distribution systems (MWDS) are systems in which waters from different qualities are taken from sources, possibly treated, conveyed and supplied to the consumers. In addition to the hydraulic laws which describe the system behavior, equations that describe the water quality in the system are added. The consumers' demands are for quantity, pressure, and quality. The review is focusing on simulation, optimization, chlorine control, monitoring, and water security modeling in MWDS.