Copper is durable and still common, though it can develop pinhole leaks with age or water chemistry. Earthenware and vitrified clay were standard for older drainage; they last well but the joints are where roots find their way in.
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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.
