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Biden announces proposal to replace all lead water service lines in US within 10 years
(abcnews.go.com)
this post was submitted on 30 Nov 2023
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It's actually pretty common around the world. Most places stopped putting in new ones but haven't gone back and phased out the old ones.
The UK and Germany for example didn't discontinue the practice until the 70s.
Usually there's a coating in the pipes that prevents contamination, allowing utilities to replace the pipes with more modern replacements as they do routine maintenance. There's a big focus on doing that maintenance ahead of schedule in the US after a series of very public incidents where that coating was damaged and lead got in the water causing serious issues.
Coating on lead pipes? I highly doubt that. The whole point of using lead is that it's malleable, corrosion resistant and cheap.
The coating is usually a scale build up and not an intentional coating.
https://www.sciencedaily.com/releases/2019/04/190403080506.htm
It's not like it's plastic lined, but there's a coating that prevents lead from leeching into the water supply that's built up by additives in the water.
If you want more info, just look up lead pipe scale.
Not that plastic coating would be much better with what we're learning about that now.