Water hardness in Tuttlingen
10.9 °dH very hard
Tap water in Tuttlingen is very hard: 10.9 °dH (195 mg/L · 11.4 gpg · 19.5 °fH).
Source: Stadtwerke Tuttlingen GmbH (swt), Trinkwasser page, Gesamthärte per waterworks 2025 (2025) · data checked 2026-10-23
Range across supply zones: 142–289 mg/L.
4 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Bodensee-Wasserversorgung supply share | 9.1 | 163 | hard |
| Wasserwerk Riedgraben | 16.2 | 289 | very hard |
| Wasserwerk Tiefental | 12.7 | 227 | very hard |
| Zweckverband Unteres Aitrachtal (Hochbehälter Leitzenfeld) | 7.9 | 142 | hard |
Stadtwerke Tuttlingen lists four sources for 2025: the Riedgraben and Tiefental waterworks, and purchased water from Zweckverband Unteres Aitrachtal and from the Bodensee-Wasserversorgung. The median is 194.7 mg/L CaCO₃, but the range runs from 141.6 mg/L (Unteres Aitrachtal) to 289.2 mg/L (Riedgraben). The tap value depends on which source feeds your district.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 10.9 °dH |
|---|---|
| Utility | Stadtwerke Tuttlingen GmbH (swt) |
How Tuttlingen compares
- Tap water in Tuttlingen is 5 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 444 of 809 in Germany (1 = hardest); 45 % of these cities have softer water.
- In Baden-Württemberg it is number 92 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Alpirsbach, 51 km away (4.2 °dH).
- Nearest city with clearly harder water: Meßkirch, 12 km away (18.8 °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 Tuttlingen
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °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 Tuttlingen water hard or soft?
It is very hard: 195 mg/L as CaCO₃ (11.4 gpg, 10.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Tuttlingen 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 Tuttlingen water?
11.4 gpg, equal to 10.9 °dH, 19.5 °fH or 195 mg/L calcium carbonate.
What dishwasher salt setting should I use in Tuttlingen?
For 195 mg/L (10.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Tuttlingen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Tuttlingen GmbH (swt), Trinkwasser page, Gesamthärte per waterworks 2025 (2025). Method: figure published by the water supplier. Stadtwerke Tuttlingen GmbH (swt), Trinkwasser page, Gesamthärte per waterworks 2025 · Outdated figure? Tell us