I have a chance to buy a beautiful large brick ranch here in Ohio that was built in 1954. It is on a slab and probably has galvanized plumbing. Areas of pipe that are exposed, such as around the water heater, have all been updated to copper. But in the slab I imagine it may still be galvanized going to each of the 2.5 baths and kitchen and outside water bibs. One advantage is that for about the past twenty years, the source that supplies water to the town softens it. And as I undertstand it that may help in reducing deterioration of the galvanized line. Someone has advised me that the galvanized that is buried in the foundation should not be a problem.