Water hardness in Sindelfingen
16.5 °dH very hard
Tap water in Sindelfingen is very hard: 16.5 °dH (295 mg/L · 17.2 gpg · 29.4 °fH).
Source: Stadtwerke Sindelfingen, Die Qualität des Sindelfinger Trinkwassers (Anlage 3 Indikatorparameter, Stand 04.09.2025) (2025-09) · data checked 2026-10-20
Range across supply zones: 163–302 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Darmsheim (WW See) | 16.5 | 295 | very hard |
| Maichingen and Sindelfingen Nord-Ost (Bodenseewasser, BWV) | 9.1 | 163 | hard |
| Sindelfingen Innenstadt, Süd-West, Hinterweil, Schleicher, Goldberg, Schwertstr. (WW Floschen) | 16.9 | 302 | very hard |
Sindelfingen's supply is split into three zones: the Floschen and See waterworks, and Lake Constance water (Bodenseewasser) for Maichingen and the north-east. The Lake Constance zone is the softest, which pulls the low end of the range down to 162.6 mg/L CaCO₃, while the city median is 294.5 mg/L and the top is 301.7 mg/L. The zone figures are dated mid-2024 to September 2025.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 16.5 °dH |
|---|---|
| Utility | Stadtwerke Sindelfingen GmbH |
How Sindelfingen compares
- Tap water in Sindelfingen is 43 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 200 of 809 in Germany (1 = hardest); 75 % of these cities have softer water.
- In Baden-Württemberg it is number 41 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Leonberg, 10 km away (8.9 °dH).
- Nearest city with clearly harder water: Vaihingen an der Enz, 25 km away (28 °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 Sindelfingen
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S2 |
| LG | H3 |
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 Sindelfingen water hard or soft?
It is very hard: 295 mg/L as CaCO₃ (17.2 gpg, 16.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sindelfingen 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 Sindelfingen water?
17.2 gpg, equal to 16.5 °dH, 29.4 °fH or 295 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sindelfingen?
For 295 mg/L (16.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Sindelfingen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Sindelfingen, Die Qualität des Sindelfinger Trinkwassers (Anlage 3 Indikatorparameter, Stand 04.09.2025) (2025-09). Method: figure published by the water supplier. Stadtwerke Sindelfingen, Die Qualität des Sindelfinger Trinkwassers (Anlage 3 Indikatorparameter, Stand 04.09.2025) · Outdated figure? Tell us