An electronic monitoring system is provided to monitor for and sense water leakage at multiple locations and sources within a commercial or residential property. These sources are hot water heaters, hot water boilers, air conditioning system evaporators, washing machines and sinks. The microprocessor based control will determine the location of the leak, sound a local audio and visual alarm to denote an alarm condition and illuminate appropriate LED's on the face of the control to indicate the location and type of water leak within the structure being monitored. The system consists of multiple water sensors, a host control for data collection and system operation, an internal battery for system power, provision for connection to telephone service, with the ability to call a pre-programmed pager or telephone number to deliver synthesized voice or prerecorded voice data to indicate the address of the property, the day, date and time of the alarm and the type of leak detected.