Have to correct you there.
Cut an old iron pipe with pewter/lead soldering and what do you find?
A fat layer of chalk isolating the water from the lead.
The Romans knew this 2,000 years ago, so they "cured" the pipes for some years before they started drinking the water, as described in old engineering handbooks.
BTW: Some small part of any water you drink anywhere has probably been through King James' kidneys, Newton's too and Koo Fung Mai's, etc.