Lead pipes are less of an issue that it would seem, as the pipes quickly develop a layer of calcium salts on the inside, preventing the water from actually coming into contact with the lead.

This right here.

If people remember the lead in drinking water contamination in Flint Michigan, its because they had lead pipes that were well coated with the protective layers and had no trouble with lead in water. Then the newly elected city manager changed water sources to cut costs against the advice of the water engineers in the city. The other source of water was more acidic and stripped out all that protective coating and suddenly there’s huge amounts of lead in the drinking water from the pipes.