[HayZee518]

galvanized is not the plumbing of choice - galvanized is a piece of metal pipe coated with molten zinc both inside and out. copper pipe is preferred over the other types of plumbing pipe. two types of copper is supplied type L and type M. both are made of copper - one has a heavier wall than the other and twice as expensive. PVC is plastic CPVC is Chlorinated Polyvynil Chloride. PEX for a main line I would not use. Nowadays what doesn't cause cancer? Anyway you are looking at a long, long time for anything to cause cancer - it won't happen overnight. Copper pipe or "tubing" is soldered with a no lead solder.