The document discusses the water supply system in Jakarta, Indonesia. It notes that Jakarta receives its raw water from the Jatiluhur Dam (81%) and internal sources within Jakarta (3%), with the remaining 16% coming from treated water from Tangerang. It describes the existing water production and distribution infrastructure, including various water treatment plants and canals. It also outlines constraints such as limited water resources, high non-revenue water, and the need for infrastructure upgrades. Finally, it discusses policies to address these issues and develop the water supply system to meet growing demand.