Water hardness in Stahnsdorf
23.3 °dH very hard
Tap water in Stahnsdorf is very hard: 23.3 °dH (416 mg/L · 24.3 gpg · 41.6 °fH).
Source: WAZV Der Teltow – Trinkwasserqualität (Stand 09.01.2026) (2025) · data checked 2026-10-29
Range across supply zones: 346–496 mg/L.
WAZV Der Teltow published its water quality data on 9 January 2026, giving 415.9 mg/L CaCO₃ for Stahnsdorf within a range of 346.3 to 496.2 mg/L. Calcium is 147 mg/L and magnesium 11.7 mg/L. That is higher than Berlin (328.4 mg/L) and Potsdam (339.2 mg/L). Very hard water like this scales heating elements fast, so descale often.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 23.3 °dH |
|---|---|
| Calcium (mg/L) | 147 |
| Magnesium (mg/L) | 11.7 |
| Utility | WAZV Der Teltow |
How Stahnsdorf compares
- Tap water in Stahnsdorf is 103 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 23 of 809 in Germany (1 = hardest); 97 % of these cities have softer water.
- In Brandenburg it is number 2 of 15 cities; the regional median is 16 °dH.
- Nearest city with clearly softer water: Berlin, 20 km away (18.4 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Stahnsdorf
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 23 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Stahnsdorf water hard or soft?
It is very hard: 416 mg/L as CaCO₃ (24.3 gpg, 23.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Stahnsdorf safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
How many grains per gallon is Stahnsdorf water?
24.3 gpg, equal to 23.3 °dH, 41.6 °fH or 416 mg/L calcium carbonate.
What dishwasher salt setting should I use in Stahnsdorf?
For 416 mg/L (23.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Stahnsdorf?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: WAZV Der Teltow – Trinkwasserqualität (Stand 09.01.2026) (2025). Method: figure published by the water supplier. WAZV Der Teltow – Trinkwasserqualität (Stand 09.01.2026) · Outdated figure? Tell us