This volume explores the transformative potential of emerging technologies in achieving SDG 6 – Clean Water and Sanitation, a foundational goal of the UN Agenda 2030. This volume investigates how smart technologies—including artificial intelligence, the Internet of Things, big data analytics, blockchain, and remote sensing—are reshaping water resource management, sanitation systems, and wastewater treatment across diverse geographies. As one of the first comprehensive works to address the synergy between technological innovation and sustainable water solutions, this book is an essential resource for academics, researchers, engineers, and policy professionals. It offers practical insights for national and local governments, NGOs, and industry leaders aiming to implement inclusive, efficient, and climate-resilient water and sanitation infrastructure. By bridging global gaps in access to clean water, this work supports the collective mission toward universal health, environmental sustainability, and human dignity.