USED AMOUNT MANAGEMENT SYSTEM OF TAP WATER

PROBLEM TO BE SOLVED: To provide a system capable of providing information that can determine a water saving action of a target water amount achievable in the evaluation period of tap water in a place where the tap water is used.SOLUTION: A used amount management system of tap water includes a water amount confirmation device 10 provided in vicinity of a water use facility 31, and a management device 20 of a water use amount. A control part 22 of the management device 20 receiving water amount data measured by the confirmation device 10 is set with an evaluation period and a use target water amount within the evaluation period. The control part 22 calculates an actually used water amount from an evaluation starting point to a present time point based on the water amount data, calculates a residual water amount usable from a difference between the use target water amount and the actually used water amount, and moreover, calculates a subsequent usable water amount. Furthermore, the control part 22 compares the usable water amount and the used water amount at the present time point and determines good or bad of a use state of water, to provide a display instruction of the result in an operation display part 13 of the confirmation device 10.