I get that Chicago is a right-wing bogeyman and that's probably why you brought it up (I looked for other pop right-wing stuff in your comment history and was not disappointed) but the issue of cities or utilities with a high density of lead pipes needing longer is addressed in the rule, and they're granted an extended timeline. There's no reason they can't get started when everyone else does.

https://apnews.com/article/lead-epa-flint-discrimination-bid...