Water hardness in Norderstedt
11.6 °dH very hard
Tap water in Norderstedt is very hard: 11.6 °dH (208 mg/L · 12.1 gpg · 20.8 °fH).
Source: Stadtwerke Norderstedt – Agrolab Prüfbericht Gruppe A/B 29.04.2025 (2025) · data checked 2026-10-23
Range across supply zones: 159–228 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Wasserwerk Friedrichsgabe | 11.6 | 208 | very hard |
| Wasserwerk Garstedt | 12.8 | 228 | very hard |
| Wasserwerk Harksheide | 8.9 | 159 | hard |
Stadtwerke Norderstedt reports an April 2025 test for its waterworks. Harksheide is at 159.0 mg/L CaCO₃, Friedrichsgabe at 207.5 mg/L and Garstedt at 227.6 mg/L. The city figure of 207.5 mg/L is computed from these and sits close to Hamburg's 208.8 mg/L. Which waterworks serves your street changes the figure by up to about 69 mg/L.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 11.6 °dH |
|---|---|
| Calcium (mg/L) | 79.8 |
| Magnesium (mg/L) | 6.87 |
| Utility | Stadtwerke Norderstedt |
How Norderstedt compares
- Tap water in Norderstedt is close to the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 398 of 809 in Germany (1 = hardest); 51 % of these cities have softer water.
- In Schleswig-Holstein it is number 14 of 26 cities; the regional median is 12 °dH.
- Nearest city with clearly softer water: Kellinghusen, 32 km away (8.9 °dH).
- Nearest city with clearly harder water: Rellingen, 13 km away (17.4 °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 Norderstedt
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Norderstedt water hard or soft?
It is very hard: 208 mg/L as CaCO₃ (12.1 gpg, 11.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Norderstedt 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 Norderstedt water?
12.1 gpg, equal to 11.6 °dH, 20.8 °fH or 208 mg/L calcium carbonate.
What dishwasher salt setting should I use in Norderstedt?
For 208 mg/L (11.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Norderstedt?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Norderstedt – Agrolab Prüfbericht Gruppe A/B 29.04.2025 (2025). Method: computed from supplier's calcium and magnesium. Stadtwerke Norderstedt – Agrolab Prüfbericht Gruppe A/B 29.04.2025 · Outdated figure? Tell us