Most people throw out a jug of milk after a week or so. The oldest bottle of wine, on the other hand, is the most savored.
But what about water?
Some of what comes out of faucets in Annapolis, Leonardtown or Easton, it turns out, is older than the finest vintage — and the practice of dairy farming itself.
Glaciers that melted more than two million years ago deposited layers of sediment around what is now the Chesapeake Bay. Underground rivers run between those layers, tapped by wells and recharged by rainfall over time. The water flowing in them is tens of thousands to more than 2 million years old, according to recently published research, a fact that had been...