Following the successful completion of ECA’s previous work in Indonesia, resulting in the implementation of National Urban Water Supply (NUWAS) framework, we were asked to assist the World Bank Team Jakarta to design a regional water supply and PPP framework. The regional water supply frameworks developed under this assignment aims to provide a streamlined and consistent approach and associated tools for the development of Indonesia’s regional water supply scheme. The framework will provide guideline on how to assess raw water availability, demand and market potential in different local government areas, types of institutions suitable to build and operate the regional bulk water infrastructure, and cost and bulk water tariff structures.