Water is increasingly becoming a valuable and scarce resource. Population growth has significantly driven up demand, leading to the over-exploitation of water across domestic, agricultural, commercial, and industrial sectors. This excessive consumption, compounded by the effects of climate change and pollution, jeopardizes the long-term sustainability of our environment. To address these challenges, it is essential to fundamentally rethink traditional approaches to water management, treatment, and conservation.his chapter explores the transformative potential of digital technologies in water management, particularly within the emerging framework of Water 4.0. It examines key innovations such as cyber-physical systems (CPS), the Internet of Things (IoT), artificial intelligence (AI), digital twins, big data analytics, advanced leak detection, geographic information systems (GIS), and automation, all of which are reshaping water management practices. These technologies enhance monitoring capabilities, provide predictive insights, and enable real-time data analysis, thereby improving system efficiency, reducing water losses, and supporting informed decision-making. The chapter also discusses the challenges and risks associated with the integration of digital technologies, including cybersecurity vulnerabilities, concerns over data privacy, and the necessity for robust regulatory frameworks. Finally, it outlines future research directions and advancements in digital water management, highlighting the importance of continued innovation for sustainable water use.