FWIW some of that is a combination of pH, water treatment, and quality of the piping. Water can have some kind of phosphate added to it that will protect copper pipes. When I lived in CA this was a huge issue because the main builder of many communities used substandard copper piping and combined with the high levels of treatment, leaks would happen all the time. My condo had 3 huge leaks in 6 years (that I know of). It was crazy shit to see my ceiling start to collapse because there was a 50 gal bubble over my living room.