Water resource conservation is a crucial aspect of environmental protection that requires legal knowledge and awareness starting in school. This study aims to analyze the increase in high school students’ knowledge regarding the urgency of water resource conservation as a foundation for developing environmental legal awareness. This study employs an empirical approach using a single-group pre-test/post-test design. A total of 70 students participated in this study. Data were collected using a knowledge assessment tool that measured five indicators: understanding of the definition of water resource conservation; knowledge of Quranic verses regarding the importance of water; understanding of the importance of community participation; understanding of efforts to conserve water reserves; and knowledge of tree species that support water reserves. The data were analyzed descriptively by comparing The research results show improvements across all indicators. The average knowledge level increased from 49.6% to 96.2%, a rise of 46.6 percentage points. The greatest increase was observed in knowledge regarding trees that support water reserves, which rose from 10% to 98%. These findings suggest that education on water resource conservation can strengthen knowledge as a foundation for fostering environmental legal awareness. However, the increase in knowledge
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