All you'd need to do to prove the statement is find one in-service lead pipe in each state. Not exactly a high bar. Not sure what the point of nitpicking this is?
Finding one in-service lead pipe in each state IS a pretty high bar.
A more rational approach would be to look at testing for lead levels in tap water, which we can assume probably does get done by the EPA and other agencies.
Stating that lead pipes are relatively widespread isn't hysteric. In most cases, lead pipes are harmless, although if the chemical composition of the water changes, that can lead to dangerous lead leaching (see Flint, MI).