How Hard Is the Water at Your Berlin Postcode
Every Berlin postcode runs officially hard water, but a kettle in Wedding and a kettle in Köpenick do not scale at the same speed. This map colours all 190 Berlin postcodes with the official Berliner Wasserbetriebe hardness values, so you can read your street's real range and set your machines to it.
Values are the official Berliner Wasserbetriebe per-postcode network analysis values, read on 11 September 2026, with the nine waterworks' 2025 annual medians as the citywide reference. The network blends water from several works by demand, so each postcode carries a published range, not one fixed number. Postcode boundaries from Berlin open data.
Type your postcode or tap your area on the map. The panel below plots your street's official hardness range on a scale from soft to hard, next to the values of the nine waterworks that feed the network. Under the numbers sit the three settings that actually change anything: the hardness value for your dishwasher, the detergent column for your washing machine, and the descaling rhythm that fits your degrees rather than a guess. The map is coloured at postcode level, so you can also see the real pattern across town: softest around Tegel in the northwest, hardest towards the Müggelsee in the east and southeast.
Why the ranges are honest
Berlin's waterworks operate as one connected network and pump more or less into the pipes as demand shifts, so the water at your tap is always a blend. That is why the official answer for a postcode is a range like 14,2 to 20,9 degrees rather than a single number, and why this tool shows the range instead of pretending to more precision than the utility itself claims.
The two hardness numbers
Total hardness is all the dissolved calcium and magnesium, and it decides the dishwasher setting and the detergent dose. Carbonate hardness is the share that turns into kettle scale when the water is heated. Both come from the same official per-postcode table, and everything above 14 degrees counts as hard under German water law, which in Berlin means everywhere.
What the map cannot tell you
Anything about the pipes inside your building; the utility's numbers describe the network up to the house connection, and the last metres belong to the landlord. It also does not make hard water a health problem, because it is not one: the hardness is calcium and magnesium, the water is controlled under the drinking water ordinance, and the damage is limited to appliances, which the settings here protect.