My dad was a civil engineer on the clean water side of public health. In the late 1970s, when my parents moved into the house I grew up in, he replaced the supp

My dad was a civil engineer on the clean water side of public health. In the late 1970s, when my parents moved into the house I grew up in, he replaced the supply line to the street and most of the plumbing. We never talked to him about it, but lead seems like a good guess (a side benefit, the water pressure from a slightly larger meter and clean pipes is a wonderful thing).