Water is a crucial resource on the Earth, necessary for life and human advancement. Although the industrial revolution has driven global progress, it has also reduced the amount of available usable water, requiring strong regulatory frameworks to effectively manage water consumption and wastewater treatment. This chapter explores the interrelated themes of water usage, wastewater prediction, and water management, all of which are essential for sustainable water governance. The important role of water in everyday life has been highlighted and different facets of water use, as well as methods for conservation have been examined. The importance, methodologies, and applications of wastewater prediction have been discussed, emphasizing its usefulness in planning and pollution management. The progression of international water policies and prospective future developments are analyzed. Finally, the relationship between water consumption and wastewater prediction has been analyzed, emphasizing the essential requirement for laws to bridge gaps and foster sustainable management of water resources for future generations.