Typically, a galvanized piping system can last 30-50 years before you will begin to notice poor water quality. The quality of the material the pipe is made of, as well as where you live (due to the water quality and soil composition) can also greatly affect the lifespan. We have seen galvanized systems deteriorate in as little as three years and seen pipes that are 75 years old look almost new. One common misconception is that copper piping will last forever. Although copper will typically last longer than galvanized, the lifespan will also be affected by the issues mentioned above, (ie. material, water and soil quality).