Lead pipes are common in OLD houses but even there
lead
pipes are only used for drainage and not for incoming water.
I don't think lead pipes have been used for incoming water
for AT LEAST 150 years.
Here in the UK, lead pipes were used for incoming water
until relatively recently (for values of recently in
the region of "but not in the last three or four decades
or so"). My parent's house (built in the 1950s I believe)
originally had an incoming supply via a lead pipe.
These days it's all plastic (until either the water board
external stop-cock or the under-the-kitchen-sink stopcock).
Antonio
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Antonio Carlini arcarlini(a)iee.org