So, now you know why they installed lead water lines in DC, Flint, etc., etc....
...and why the fed continues to maintain that there IS a safe level of lead intake.
Lead pipes used to be common, if you look into the Flint situation the lead leaching issue arose when they switched from the Lake Huron water to the corrosive Flint river water about 2014 which caused the lead pipes to start leaching their lead.