 If you are still out and about tonight celebrating the holiday, Metro Rail and bus trips are free for the rest of the night. Parking at Metro lots also free. Metro Rail will run until midnight and is operating on a Sunday schedule. It's 10.05. Go ahead, drink that tap water. The boil water advisory for D.C. and most of Arlington has been lifted. WTOP's Neil Augenstein has learned more about what the problem was and how it was dealt with.