Water conservation and sustainability have emerged as critical pillars of global environmental policy in response to escalating freshwater scarcity. The growing urgency of Sustainable Development Goal 6 has catalyzed a surge of interdisciplinary research spanning desalination, wastewater treatment, and digital monitoring technologies. This study provides a comprehensive bibliometric analysis of 19,740 scholarly records retrieved from the Scopus database, covering publications from 1941 to 2026 with a primary analytical focus on the 2021–2025 period. Using computational metadata extraction, keyword co-occurrence analysis, and thematic density mapping, we identify dominant research clusters, prolific contributors, and emerging thematic trajectories. The findings reveal that scientific production has grown by 32.9% in 2025 alone, with “Sustainability” (396 occurrences), “Water Reuse” (316), and “Wastewater Treatment” (282) as the most prominent author keywords. A total of 50,140 unique authors contributed across 5,989 distinct sources, accumulating 579,615 citations with an average of 29.36 citations per document. China, the United States, and India together dominate over 60% of the global output. The keyword co-occurrence matrix uncovers a tightly integrated nexus between wastewater treatment, desalination, and climate change adaptation. This paper synthesizes the current state of the art and highlights emerging digital trends—including smart water grids and geotechnological monitoring—as critical future research directions.
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