History of OWSA

The Waterworks Department of the Osaka Prefectural Government

 Since February 1951, the Waterworks Department of the Osaka Prefectural Government, which is the predecessor of OWSA, had been started serving as a bulk water supplier sourced from the Yodo River by providing this "life-giving water" to private homes via the municipalities. Throughout this time, they had been engaged in projects intended to respond to rapidly increasing water demand. They had also taken steps to establish facilities providing Advanced Water Treatment in order to improve the water quality. Since July 1998, all three water treatment plants― Murano, Niwakubo, and Mishima ― had been providing safe and better tasting water through Advanced Water Treatment.
 In Osaka Prefecture, the industrial infrastructure constructed between 1959 and 1969 was designed to handle industrial water in order to accommodate demand for industrial water in the Sakai-Senboku Coastal Industrial Zone. Between 1987 and 1994, facility improvements made to Rinku Town and the food processing industrial complex on the shore opposite Kansai International Airport have contributed greatly to industrial development. Moreover, between 1964 and 1979, the industrial water system was constructed as part of the land subsidence prevention plan in order to provide a substitute for industrial groundwater after groundwater regulations were drawn up in the Hokusetsu, Higashiosaka and Senshu regions.

Osaka Water Supply Authority

 In order to cope with a big change of the management environment such as a decline in water demand or an increase of the facilities rehabilitation expense, The Public Water Supply System in Osaka Prefecture should be managed more efficiently by wide-area mutual cooperation with each water supplier. Thus, 42 municipalities in Osaka Prefecture (excluding Osaka City) jointly established OWSA and OWSA took over the tap water supply (water wholesale) and industrial water supply services from the Waterworks Department of the Osaka Prefectural Government on April 1, 2011.
 We stably keep supplying safe and better tasting water to the residents of Osaka Prefecture at a low cost.