It now appears that the drinking water stored aboard US airliners is bad and getting worse, and not better,despite government warnings on the required sanitation improvements,the EPA has recently said. About one in six airliners in this latest round of testing conducted in November thru December found drinking water that badly failed to meet even the minimum federal safety and health standards,the EPA said. Similar tests in August and September showed the water in one in eight aircraft testing positive for coliform bacteria. This latest round of testing produced positive results for presence of the bacteria in 29 out of 169 randomly selected passenger aircraft carrying domestic and international passengers. The tests were done on water from the galley and lavatory faucets on planes at 14 airports chosen throughout the United States. My advise would be to only drink bottled fluids once your on your flight from any location within the United States.