The house that we bought in 67 had a lead service line. I didn't know anything about them at that time, but in 69 it started to leak. City crew dug it up and patched it, three days later it leaked again, so I hired a digger, bought a roll of K copper and replaced it. Probably the smartest thing I've ever done, all by accident. I did notice that the part of the line that I could see was coated on the inside with a lot of white stuff, either calcium or alkali, so I'm sure this protected the people that lived here as long as they didn't disturb it.