Many visitors to a foreign city want to know if you can drink the water. Well, in Vienna, mineral water comes out of the taps. And I’m only half joking.
You never realized how bad the tap water is back home until you experience the Viennese equivalent; over 95% of Vienna’s water comes through two pipelines direct from the Alps. They don’t even need to pump it…gravity does the job for them.
These supply areas have no significant industry and few people all told (it’s basically mountains and not a lot else). As a result, most of the tap water is very high quality, low in nitrogen, has no measurable pesticide residues and, frankly, tastes as good as any mineral water you’re ever likely to drink.
(In case you were wondering, Viennese people still buy vast quantities of mineral water.)
In other words, you need have few worries at all about drinking or using the tap water. In fact, in contrast to most cities, it’s the undrinkable water that tends to get labelled. If you see a sign “Kein Trinkwasser” that means the water is not suitable for drinking. You’ll see such signs on some large fountains, for example.
As you wander the city you’ll come across drinking water fountains put there for your refreshment. These are labelled “Trinkwasser” (drinking water) to make it clear that you can use them. Vienna has around 980, and the city also sets up mobile drinking fountains in busy areas on hot days.