PURPOSE: To monitor wasteful water without troublesome labor, and find leakage water earlier.

CONSTITUTION: An equipment is composed of a signal receiving counter 2 for providing the input of pulse signal from a dealing water supply meter 1 and counting the signal, a pulse buffer 4 for providing the input of the pulse signal and generating output to be converted as external section contact signal, and a water supply monitoring board 7. The signal from the pulse buffer is counted by the water supply monitoring board 7, and it has function for printing an estimate value and alarming with the estimate value equal to or more than a specified value. During a set time at midnight, when a feed water quantity comes to a quantity more than a set flow rate, then alarm is performed by a buzzer or a lamp.