The best time to replace the water supply pipes in your home is at your convenience before a potentially catastrophic flood occurs. No one can predict when leaks occur, but sometimes pipes can corrode from the inside out causing low pressure conditions in the home. This is a common indicator of the need to replace the water supply pipes. Inspect all components of your plumbing system above the visible point of egress to and from your walls, this can indicate the conditions of your plumbing system as a whole.