Lead exists in the environment. It would be impractical to impossible to eliminate it entirely from the blood streams of most people. However certain areas have extremely dangerous concentrations such as dirt near major roads/old buildings, water in certain areas, and lead paints.
Lead pipes are an interesting one where it is simply impractical to replace all the pipes and remove lead in old cities. Hence as long as the calcification holds there is no action on the small amount of lead which leaks into the pipes.
The problem is that pipe ownership in a domestic home is the property of the homeowner, and there's no political will to do that kind of massive wealth transfer from the public coffers to the improved infrastructure of millions of individual properties. But while it wouldn't be inexpensive, it's on par with other expenditures the federal government makes for federal projects.
What we really want to know is: how big of a deal is this really?
We used to use lead based pesticides at the dawn of the 20th century, if you eat any food grown in the midwest you are exposing yourself to reasonably large quantities of lead.