<![CDATA[High levels of Non-Revenue Water (NRW) remain a major challenge for Drinking Water Supply Systems, particularly in island regions. The study aimed to analyze the water distribution system condition, water loss level, and institutional performance of the Yapen Islands Regency Water Utility (PDAM) in supporting sustainable water supply. The research employed a quantitative descriptive approach with an evaluative method through field observations, interviews, and document reviews. NRW analysis was conducted using water balance with WB-EasyCalc, while institutional performance evaluation referred to the BPP-SPAM Guidelines. Results showed the NRW level reached 33.23% or 1,072,022 m³/year and was dominated by physical losses caused by pipeline leakage and inadequate distribution control. The institutional performance evaluation yielded a score of 3.01, indicating the PDAM is categorized as “Healthy”. Nevertheless, indicators such as billing collection efficiency and human resource training still require optimization. Therefore, distribution network rehabilitation, District Metered Area (DMA) implementation, improvement of distribution monitoring systems, and strengthening of institutional and human resource capacities are required to support sustainable water supply management.]]>
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