 This is Washington's Top News. WTOP News. Facts Matter. It's 522. Hey, it's safe to drink the tap water again in the district and most of Arlington. Good news indeed. The boil water advisory that was put in place last night was lifted this morning. And WTOP's Neil Augenstein has been learning more about why it was imposed in the first place. Here at the Washington Aqueduct, algae was clogging filters.