Water hardness in Schliengen
12.6 °dH very hard
Tap water in Schliengen is very hard: 12.6 °dH (224 mg/L · 13.1 gpg · 22.4 °fH).
Source: Gemeinde Schliengen Wasserwerte page (Gesamthärte 15 °dH, Messung 02.11.2026, HB Erlenboden) vs. Untersuchungsbefund Nr. 00561/255218, Untersuchungsinstitut Heppeler (Entnahme 22.01.2026, report 26.02.2026, Gesamthärte 2,24 mmol/l) (2026-01) · data checked 2026-11-06
The Schliengen value, 224.2 mg/L CaCO₃ (2.24 mmol/l), comes from a Heppeler laboratory report on a sample taken on 22 January 2026. The municipality's own water-values page prints a higher figure of 15 °dH, so the two figures differ. If you need certainty, ask the Gemeinde which figure applies to your address.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 12.6 °dH |
|---|---|
| Utility | Zweckverband Gruppenwasserversorgung Hohlebach-Kandertal |
How Schliengen compares
- Tap water in Schliengen is 9 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 362 of 809 in Germany (1 = hardest); 55 % of these cities have softer water.
- Nearest city with clearly softer water: Steinen, 15 km away (4.4 °dH).
- Nearest city with clearly harder water: Rheinfelden (Baden), 28 km away (22 °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 Schliengen
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °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 Schliengen water hard or soft?
It is very hard: 224 mg/L as CaCO₃ (13.1 gpg, 12.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Schliengen 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 Schliengen water?
13.1 gpg, equal to 12.6 °dH, 22.4 °fH or 224 mg/L calcium carbonate.
What dishwasher salt setting should I use in Schliengen?
For 224 mg/L (12.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Schliengen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Gemeinde Schliengen Wasserwerte page (Gesamthärte 15 °dH, Messung 02.11.2026, HB Erlenboden) vs. Untersuchungsbefund Nr. 00561/255218, Untersuchungsinstitut Heppeler (Entnahme 22.01.2026, report 26.02.2026, Gesamthärte 2,24 mmol/l) (2026-01). Method: own measurement. Gemeinde Schliengen Wasserwerte page (Gesamthärte 15 °dH, Messung 02.11.2026, HB Erlenboden) vs. Untersuchungsbefund Nr. 00561/255218, Untersuchungsinstitut Heppeler (Entnahme 22.01.2026, report 26.02.2026, Gesamthärte 2,24 mmol/l) · Outdated figure? Tell us