The calculation methodology for WSI used in this study is based on 3 (three) main components comprising of water resources, ecological system, and demand magnitude and clean water consumption. This paper describes a new strategic approach aiming to identify water stress areas with the development of a water stress index (WSI) which further becomes a basis in determination of policy and strategy for the improvement of clean water and sanitation condition in the Jakarta Metropolitan City. With very low level of water security condition (2.29%), many areas in Jakarta experience a serious clean water stress and poor sanitation, one of the critical area is the North Jakarta. On the other hand, the urban environmental sanitation condition is also very critical, especially due to pollutant load that is always being discharged into water bodies in the form of urban waste (wastewater and solid waste). However, at the same time it is always facing flood and stagnation threat, especially in the wet season. As a capital city of the Republic of Indonesia, Jakarta is always experiencing scarcity of raw water source to meet the clean water need and a very low water service coverage (<45%). Jakarta metropolitan city with total area of 662 km 2 and real population reaching 12.5 million people is currently facing critical condition with respect the environmental support, particularly water resources.
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