Air merupakan salah satu komponen yang paling penting dalam kelangsungan kehidupan manusia dan makhluk hidup lainnya. Air memberikan pengaruh langsung terhadap kesehatan manusia. Air dapat menjadi media dalam penyebaran penyakit yang dikenal dengan water borne disease, tidak terkecuali air minum. Daerah rawan banjir beresiko terhadap timbulnya water borne disease terhadap berbagai penyakit, terutama penyakit berbasis lingkungan seperti diare. Pentingnya sanitasi air bersih dapat menurunkan resiko akibat bencana banjir, dengan program pengabdian kepada masyarakat melalui edukasi Kesehatan lingkungan. Edukasi ini memaparkan suatu pendidikan tentang air bersih. Kegiatan edukasi ini dilakukan di Balai Desa Carak Kecamatan Sawang Kabupaten Aceh Selatan. Metode menggunakan kuesioner pre-edukasi dan pasca-edukasi, dengan masing-masing 10 pertanyaan, diantaranya tentang sumber air bersih, ketersediaan jamban, pengelolaan sampah, saluran pembuangan air limbah (SPAL) dan drainase. Edukasi memberikan efek terhadap perubahan pengetahuan, sikap dan tindakan masyarakat tentang sanitasi air bersih, dibuktikan dari jawaban responden. Kesimpulan pengabdian masyarakat ini bahwa responden mengetahui sumber air bersih, memiliki jamban sehat, pengelolaan sampah, saluran pembuangan air limbah (SPAL) dan drainase. Saran agar dinas dan pemerintah terkait memberikan perhatian dan pengawasan terhadap daerah aliran sungai (DAS) saat volume air meningkat, dan pemeliharaan jamban desa bagi yang belum memiliki jamban sendiri. Kata Kunci : edukasi air bersih, sanitasi lingkunganABSTRACTWater is one of the most important components in the continuity of human life and other living things. Water has a direct influence on human health. Water can be a medium for spreading a disease known as water borne disease, including drinking water. Flood-prone areas are at risk of developing water borne disease for various diseases, especially environment-based diseases such as diarrhea. The importance of clean water sanitation can reduce the risk of flood disasters, with community service programs through environmental health education. This education describes an education about clean water. This educational activity was carried out at the Carak Village Hall, Sawang District, South Aceh Regency. The method uses pre-education and post-education questionnaires, with 10 questions each, including about clean water sources, availability of latrines, waste management, sewerage and drainage. Education has an effect on changing people's knowledge, attitudes and actions about clean water sanitation, as evidenced by respondents' answers. The conclusion of this community service is that the respondents know the source of clean water, have healthy latrines, waste management, sewerage and drainage. Suggestions for related agencies and government to pay attention and control to watersheds when the volume of water increases, and maintenance of village latrines for those who do not have their own latrines. Keywords : health education clean water, environmental sanitation