The book provides a scientific analysis of Intermittent Water Supply (IWS) on a global scale, estimating the affected population by country and region. It examines the root causes and implications of IWS, highlighting resistance to transitioning to continuous supply. A key focus is on water losses, leakage detection, and metering challenges in IWS conditions. The book presents a methodology for transitioning to continuous supply, addressing technical, social, and communication factors. Case studies from around the world illustrate the challenges faced by water utilities managing IWS.