As a general position, pipework serving a single lot tends to be the lot owner's responsibility, while pipework serving more than one lot, or sitting in common property, tends to be the owners corporation's. The boundary is not always obvious, particularly where a line runs within a wall or slab shared between lots.
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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.
