Water hardness in Stühlingen
21.6 °dH very hard
Tap water in Stühlingen is very hard: 21.6 °dH (386 mg/L · 22.5 gpg · 38.6 °fH).
Source: Stadt Stühlingen, Chemisch-physikalische Trinkwasseruntersuchung (Mitteilungsblatt, Stand Juni 2026) (2026-06) · data checked 2026-11-06
The value of 385.9 mg/L comes from the water analysis published by the town of Stühlingen, dated June 2026. It applies to a supply zone that includes Eberfingen, Grimmelshofen and Weizen. The town's Mitteilungsblatt (official bulletin) shows which areas are covered.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 21.6 °dH |
|---|---|
| Utility | Stadt Stühlingen (Wasserversorgung) |
How Stühlingen compares
- Tap water in Stühlingen is 88 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 45 of 809 in Germany (1 = hardest); 95 % of these cities have softer water.
- In Baden-Württemberg it is number 8 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Blumberg, 13 km away (16.4 °dH).
- Nearest city with clearly harder water: Vaihingen an der Enz, 137 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 Stühlingen
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 22 °dH |
| AEG / Electrolux | 5 |
| 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 Stühlingen water hard or soft?
It is very hard: 386 mg/L as CaCO₃ (22.5 gpg, 21.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Stühlingen 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 Stühlingen water?
22.5 gpg, equal to 21.6 °dH, 38.6 °fH or 386 mg/L calcium carbonate.
What dishwasher salt setting should I use in Stühlingen?
For 386 mg/L (21.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Stühlingen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadt Stühlingen, Chemisch-physikalische Trinkwasseruntersuchung (Mitteilungsblatt, Stand Juni 2026) (2026-06). Method: figure published by the water supplier. Stadt Stühlingen, Chemisch-physikalische Trinkwasseruntersuchung (Mitteilungsblatt, Stand Juni 2026) · Outdated figure? Tell us