Broadly, the property owner is responsible for the pipework on the property, and the water authority for the mains beyond it. The point where one becomes the other is usually at or near the property boundary, and Sydney Water publishes the current position on where that sits.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
