For the continuous and stable supply of safe drinking water, it is essential to not only design suitable water treatment plants that can handle the characteristics of raw water quality but also appropriately operate and control them. Controlling complicated water treatment systems using fewer operators essentially requires hazard identification and the establishment of the operation and control of the systems by a simple method of selecting the relevant data. Therefore, the Hanshin Water Supply Authority has supported operators by adding an advanced operation supporting feature to the renewed information-processing equipment in water treatment plants. Moreover, the Authority has investigated the problem of bromate, examined measures for its reduction, and applied the control measures to the information-processing equipment so that operators can promptly cope with the problem. This supporting system is effective in terms of the Water Safety Plan. The successive development of technologies while considering the aspects of operation and control is important for realizing a continuous stable water supply.

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