**History and Current Status of Securing Water Resources in Japan (1950s-2020s)**

**History and Current Status of Securing Water Resources in Japan (1950s-2020s)**

Since the 1950s, water resource development centering on dams and weirs has progressed, resulting in a stable supply of water in urban areas. In the 2010s, precision irrigation systems were introduced in Shizuoka Prefecture, reducing groundwater use by about 20%, and Sumitomo Chemical's technology made it possible to reuse 90% of industrial wastewater in Yokkaichi City. cubic meters, and Metawater and Toshiba Infrastructure Systems are deploying water treatment technologies in Japan and abroad. Desalination technology is being used in Saudi Arabia and other countries. The water treatment market is expected to reach 100 trillion yen by 2025, and sustainable water management is being promoted.