Abstract
Private sectors and public sectors related to water treatment business in Japan have been quite active in recent years. More than 40 companies in the private sector formed “Global Water Recycle and Reuse System Association, Japan” (GWRA) in 2008 to build up a platform of the business for water recycle system and to expand it to overseas. Japanese government such as METI, MOE, MLIT and CAO have been very active in promotion of water related R&D and private sector’s water business supporting programs. The outline of the project such as NEDO’s project on “Water–saving Recycling System”, JST/CREST’s “Development of innovative technologies for realizing sustainable water management by mitigating water”, MLIT’s “Advance of Japan Ultimate Membrane Bioreactor technology : AJUMP”, CAO’s FIRST Program “Megaton Water System” and so on are introduced.