Abstract– In this paper, community perception on the performance status of water supply systems currently available in Mabungo Parish was assessed. A water demand assessment in Mabungo parish so as to determine the present and feature water demand was conducted. We also investigated the actual factors that influenced the sustainability of Kabiranyuma Gravity Flow Scheme. In the ongoing work, we are developing a model of sustainable water supply system for Mabungo communities in Kisoro district.