<![CDATA[Pulau Panjang Village in Puloampel Sub-district, Serang Regency, is an island community facing serious limitations in accessing clean water. Dependence on shallow groundwater vulnerable to saltwater intrusion, combined with the absence of an adequate piped water network, makes this area a priority for appropriate technology interventions. This community service activity implements Jaringan Air Warga Ramah Lingkungan Sistem Terpadu (JAWARA SISTEM), a rainwater-harvesting system based on ultrafiltration and ultraviolet (UV) sterilization, integrated with a solar panel as an off-grid energy source. Implementation employs a Theory of Change (ToC) framework that systematically maps inputs, activities, outputs, and outcomes. The system was installed at the Village Health Post (Poskesdes) of Pulau Panjang in January 2026 after institutional coordination, field surveys, technical design, and community socialization. The results show that the system produces 50 to 100 liters of water per day off-grid, with water quality verified by the Banten Provincial Laboratory and found to comply with Peraturan Menteri Kesehatan Nomor 2 Tahun 2023. This system initially serves five households in the community surrounding the village health post. This activity demonstrates that integrating rainwater harvesting technology, renewable energy, and structured community engagement provides a replicable model for coastal and small island areas facing similar challenges.]]>
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