 In Baden-Württemberg, Germany, almost 30 percent (as of 2004) of the water for the area between Stuttgart, Bad Mergentheim, Aalen and Alb-Donau (district) comes from purified water of the Danube.Other cities such as Ulm and Passau also use some water from the Danube.In Austria and Hungary, most water is drawn from ground and spring sources, and only in rare cases is water from the Danube used.