| Abstract | Evaluation of existing water supply system is required to identify problems, so appropriate measures can be taken to asses and improve the water supply services. The broad objective of this study is to asses the existing water supply system in Vientiane City, Lao PDR from management, customer feedback and technical points of view in order to suggest suitable measures and achieve equitable distribution of water throughout the selected network. The management point of view evaluation has been analyzed by appropriate performance indicators (PIs), through benchmarking exercise with other good water supply utilities, to find out what aspects should be improved. Questionnaires were used in a selected area of Vientiane City to get citizen feedback on perception of the performance of the water supply utility, through x2 test and logistic regression analysis. At the same time, the technical point of view focused on developing hydraulic model and evaluated the performance of the selected system using EPANET 2.0. The study reveals that three indicators should be paid attention to, namely water coverage, non revenue water, and number of staff per 1,000 connections. These indicators show that the water supply utility has the lowest coverage and efficiency, compared to other developed water supply utilities worldwide. From perspective of the customer, they are generally satisfied with overall performance of the water supply utility. However, continuity and water quality perception are perceived as aspects that need improvement. Under x2 test analysis, gender predictor has a significant relationship for continuity perception, and marital status for water quality perception. For logistic regression, the model shows three predictor variables which have significant relationship for continuity perception (gender, income, and age) and two predictors for water quality perception (age and income). Further, the developed model showed that at the current situation, there are some nodes having low pressure, thus some scenarios were developed to address the problem. The model result indicates that by supplying water directly to certain nodes, increasing supply, maintaining head pressure at inlet point, and placing pumping scheme in the selected network, will increase the hydraulic performance. Based on the study findings, appropriate recommendation are proposed to enhance the overall performance of the water supply utility. ropriate recommendation are proposed to enhance the overall performance of the water supply utility |