And depending on the area, the local government, local banks, and contractors could be working hand in pocket, arranging things such that you'll need to pay out the nose, and/or go into debt to resolve the problems.

Honestly, I'd probably sneak a pex run and pay a friend of a friend and not notify the authorities if faced with lead issues, but my exposure to lead might have my brain mangled to the point that I don't care or can't effectively plan a surreptitious fix. Flint is just all sorts of fucked.