Water is one of our planet's most essential resources, and its scarcity is becoming a growing concern worldwide. With urbanization and the rise in population, the demand for clean, usable water in building services is escalating, putting immense pressure on global water supplies. As we continue to build the cities of tomorrow, the sustainability of these urban environments will largely depend on how effectively we manage and conserve this precious resource. In Sustainable Water Management in Building Services, I aim to explore innovative approaches and practical solutions to address the water challenges facing modern buildings. From rainwater harvesting and greywater recycling to the implementation of efficient plumbing systems, this book delves into the strategies that can reduce water waste and enhance sustainability in both new constructions and retrofitted buildings. The goal of this book is to provide engineers, architects, facility managers, and building owners with actionable insights and techniques to improve water sustainability. By implementing these solutions, we can contribute to a future where buildings not only consume fewer resources but actively promote environmental stewardship. The challenges ahead are significant, but they are not insurmountable. I hope this book will serve as a guide and inspiration to those involved in building services, encouraging them to adopt water management systems that benefit both the environment and the communities they serve. With sustainability as a guiding principle, we can make a meaningful impact on water conservation in the built environment, leading to healthier cities and a more sustainable future. Charles Nehme