Water distribution systems are designed to fulfill all requirements of potable water neededrnfor intended purposes. Initial system designs frequently consider any anticipated changesrnlikely to happen. However, as time elapsed they slowly begin to fail to satisfy customersâ€™rnrequirements, both in quantity and quality. The main issue is to identify factors which bringrnthose changes and propose viable solutions to improve the situation. To this effect modelingrnwater supply distribution network system is very helpful. In this study, Tuffa-Bubula multivillagernWater distribution system was assessed as a case study.rnEPANET software was used as tool to model water distribution system. The modeling effortrnincluded both hydraulic and water quality modeling. Simulation results for maximum andrnminimum pressures were used as base to evaluate the hydraulic performance andrnsimulation result for water age and minimum residual chlorine were used as base to assessrnwater quality transformation in the distribution system. Modeling results showed violation ofrnmaximum and minimum pressure requirements. Along with this, water quality simulationrnresults indicated water quality deterioration due to insufficient residual chlorine which isrnbelow WHO guideline. To retrieve the situation there is a need to intervene. Modifications inrnoperation and design will improve the current situation of the case study of water distributionrnsystem.rnKeywords:- Water distribution system, modeling, Hydraulic performance, Waterrnquality, Maximum pressure, Minimum pressure, Water age, Residual chlorine, Tuffa-rnBulbula, Ethiopia.