That's not totally true. I've personally removed lead pipes from houses that were built in the 1940s to 1960-1961. They stopped that shit sometime in the '50s or very early '60s here in the US, depending on the state. So it would be true that no house built in the last 65-75 years would have lead pipes, any old houses that have been sitting empty for the last few decades may actually still have some lead pipes.