In response to a request from the Royal Government of Cambodia, the Government of Japan decided to conduct the Study on the Master Plan of Greater Phnom Penh Water Supply (Phase 2) in the Kingdom of Cambodia and entrusted the study to the Japan International Cooperation Agency (JICA). The main objective of the Study was placed on the formulation of water supply development plan for Greater Phnom Penh for meeting the water demand up to the year of 2020. The Study conducted a basic study in Phase I and prepared in Phase II a master plan and successively in Phase III a feasibility study. The Report presents the outcomes of the master plan and feasibility study.