People knew lead was harmful in large quantities, sure, but the science around just how bad lead is and how little can cause damage I would say was not known.

People knew lead was harmful in large quantities, sure, but the science around just how bad lead is and how little can cause damage I would say was not known. Regarding PVC: It already is not used in almost any new construction for water supply lines, at least in the US. It's used for drains, but the leeching concern isn't really an issue for drain pipes. No water pressure, and no continuous immersion typically. Issues about BPA/vinyl compounds are As per PEX, I can't say for certain that it's 100% risk free, but overall there is increased scrutiny on drinking water and contaminates and PEX right now seems to be the best choice.