Berlin's water contains many essential minerals, which is why it is called "hard". This is good for the human body, but irritates coffee machines, dishwashers etc.
What is Hard Water?
In general: the higher the mineral content, the harder the water or the higher the degree of "water hardness". This is measured in "degrees of hardness" (°dH) and classifies drinking water according to hardness ranges:
|Total hardness [°dH]||Water attribute|
|less than 8.4 °dH||soft water|
|8.4 to 14 °dH||water of medium hardness|
|more than 14 °dH||hard water|
How Hard is Berlin's Water?
Berlin's water is very rich in minerals and, therefore, has an average hardness of 14 to 25 °dH. According to the scale of the regulations on detergents and cleaning agents, Berlin's drinking water is considered to be "medium hard to hard". Spandau's water hardness is below average (15.4 °dH), Hellersdorf's water hardness is above average (21 °dH).
The water quality is not influenced negatively by the water hardness, in fact the opposite applies: The many minerals contained within have a positive effect on the human body and are an essential component of a healthy diet. For this reason, water softening is unnecessary.