The water-management system is a high priority at Mahidol University, Salaya campus; for drinking water, the University has installed automatic water dispensers around the campus, such as the Sirividhya Building, with 1 dispenser, Mahidol Learning Center (4), Sireeruckhachati Nature Learning Park (1), and the Office of the President (2). These facilities provide clean drinking water without impurities or harmful toxins (NSF 61) for staff and students. This project encourages people to reuse their own water bottle, which effectively reduces the amount of plastic waste from purchased water bottles. In addition, the University has installed an activated sludge wastewater treatment system, certified by the Pollution Control Department of the Ministry of Natural Resources and Environment. The University has laid recycled-water pipes throughout the University, which have saved 33,594 cubic meters of water, valued at 707,124 baht, between 2019-2021. To prevent flooding, the University cleans the canals and drainage system every 2 years with the help of a rain gauge. There are 3 hydraulic stations, located north and south of the university, and another at the Faculty of Engineering. The canal water is recycled water which is monitored for quality every month by measuring dissolved oxygen (DO), pH, and Biochemical Oxygen Demand (BOD). Since 2017, various technologies have been applied to the University water system. In the past, waterpipe leakage at the entrance to the vaccine building, caused a huge waste of water and insufficient water supply to all the departments. Therefore, a Ring Loop System has been installed to improve the water-supply system by adding 7 water pipes and valve controls (23 in all). The University has executed a project to lay main pipes which made from High Density Polyethylene (HDPE) to receive water directly from the Provincial Waterworks Authority, instead of the previous system. This has included installation of a digital water meter to monitor water use in real time. The data are highly accurate and can be used for decision making.