School environmental cleanliness is an important factor in supporting students’ health and learning quality at the elementary school level. However, low awareness of environmental hygiene among students is still commonly found, particularly related to littering behavior and limited understanding of waste management concepts. This community service activity aimed to improve students’ knowledge, attitudes, and environmentally responsible behavior through school-based environmental cleanliness education. The method applied was an action-based educational approach integrating environmental hygiene socialization and hands-on craft activities using inorganic waste. The results showed increased enthusiasm and active participation of students in maintaining school environmental cleanliness. This activity also reflected the implementation of adaptive leadership by university students and contributed to the achievement of several Sustainable Development Goals (SDGs).
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