In Japan, it has been pointed out that integrated coordination of water policy has been needed for a long time (Takahashi, 1993, pp.216-225); however, such integrated coordination has not been realized yet. Table 1 shows Japan’s water policies in terms of affairs, authorities (organization and sub-section), and main laws. As this table shows, the water quality and water environment is supervised by the Ministry of Environment, while the domestic water supply is supervised by the Ministry of Health, Labor, and Welfare, irrigation by the Ministry of Agriculture, Forestry and Fisheries, industrial water supply by the Ministry of Economy, Trade and Industry, and sewerage and river management by the Ministry of Land, Infrastructure, Transport and Tourism. In general, water policies in Japan are still fragmented, except for the coordination among central bureaus and local governments for emergent water shortages.