Projects are already underway and have replaced our two lagest lead service lines in the medium-small Illinois city where I live via federal funding over the last year. City literally just applied for the funds from this same program and hired private contractors once the funds were approved. About 3 months of construction on each of the 2 roads under which our main service lines run, and now lead has been fully removed from 60% of residents water supply, with the last 40% to occur over the next 18 months.
It's been pretty simple.
Which is exactly why federal funds are necessary for it rather than local. The places that need this most tend to be those with the least money for local infrastructure, but if the money doesn't have to come from the cash-strapped local budget, that's not an issue.