I live in Indiana where many homes are built on concrete slabs with the plumbing included in the slab. Most builders use copper piping for the water but after years of hard water use, these often develop small leaks. I can hear a faint sound of water running and my water bill has gone up in the last month. There is no sign of water anywhere inside or outside, so the only thing I can think of is a leak in the concrete pipe somewhere in the slab. Is this a DYI project possibility or no choice but call a plumber? Is it cheaper and more cost effective to fix the leak or is replumbing a better option. Seems more and more people are experiencing this in the Midwest.