Water Use Efficiency, Sustainability, and Circular Economy is a comprehensive guide focusing on water resource management in the context of a circular economy. The book covers a wide spectrum of topics, from water reuse and recycling strategies that foster sustainability to comprehensive life cycle assessments of grey and black water management. It explores how circular economy principles can revolutionize basic water supply networking, catalyzing a shift towards more resilient and eco-conscious urban water systems. Lastly, it contains innovative approaches like blockchain technology for water management and the circular economy perspective on wastewater resource management for energy recovery, to help students, scholars and policymakers navigate the complexities around water resource management.