A system for controlling water delivery in to and out from a structure. Sensors in the structure determine a water leak from a water delivery system within the structure or an ambient temperature. A transmitter associated with each sensor transmits a signal to a controller, the signal indicating a water leak from the water delivery system or a temperature. Valves within the structure control the flow of water in to the structure, out from the structure, and within the structure. The controller receives the sensor signals and responsive thereto opens or closes one or more valves to stop water delivery into the structure, to drain water out from the structure, or to control water delivery within the structure. A source of pressurized gas activated by the controller applies pressure to water within the water delivery system and thereby assists with draining water from the structure.