&quot;Undrinkably foul&quot; seems a bit melodramatic. It certainly has that distinctive minerally taste common to groundwater, which is quite noticeable to someone like me (and maybe you?) who lives in a city with chemically treated surface water. But in Europe using untreated or minimally treated groundwater seems to be a common approach and Copenhagen&#x27;s was amongst the most neutral tasting to me. Iceland for example has much stronger tasting tap water.