Water hardness in Bad Schwalbach
13.1 °dH very hard
Tap water in Bad Schwalbach is very hard: 13.1 °dH (234 mg/L · 13.7 gpg · 23.4 °fH).
Source: Stadtwerke Bad Schwalbach - Trinkwasseruntersuchungen 2025, Kernstadt und Stadtteile (Gruppe B, Ortsnetze) (2025-09) · data checked 2026-11-03
Range across supply zones: 120–325 mg/L.
11 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Adolfseck | 17.5 | 312 | very hard |
| Fischbach | 8.1 | 145 | hard |
| Heimbach | 12.8 | 229 | very hard |
| Hettenhain | 13.1 | 234 | very hard |
| Kernstadt Hochzone | 18.2 | 325 | very hard |
| Kernstadt Mittelzone | 16.6 | 296 | very hard |
| Kernstadt Tiefzone | 12.6 | 225 | very hard |
| Langenseifen | 16.6 | 296 | very hard |
| Lindschied | 6.7 | 120 | moderately hard |
| Ramschied | 11.6 | 207 | very hard |
| Villa Lilly | 18.1 | 323 | very hard |
Stadtwerke Bad Schwalbach tested 11 supply zones in September and October 2025, and hardness ranges from 119.6 to 324.9 mg/L CaCO₃ (6.7 to 18.2 °dH). It varies strongly by district, so the figure of 233.8 mg/L is the unweighted median across zones and not an average for the whole town. The utility notes that some zones receive a mix of its own and purchased water, which can make hardness fluctuate there.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 13.1 °dH |
|---|---|
| Utility | Stadtwerke Bad Schwalbach (Eigenbetrieb der Stadt) |
How Bad Schwalbach compares
- Tap water in Bad Schwalbach is 14 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 332 of 809 in Germany (1 = hardest); 59 % of these cities have softer water.
- In Hessen it is number 25 of 73 cities; the regional median is 10.7 °dH.
- Nearest city with clearly softer water: Taunusstein, 10 km away (10.3 °dH).
- Nearest city with clearly harder water: Eltville am Rhein, 12 km away (18.4 °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 Bad Schwalbach
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| 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 Bad Schwalbach water hard or soft?
It is very hard: 234 mg/L as CaCO₃ (13.7 gpg, 13.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Bad Schwalbach 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 Bad Schwalbach water?
13.7 gpg, equal to 13.1 °dH, 23.4 °fH or 234 mg/L calcium carbonate.
What dishwasher salt setting should I use in Bad Schwalbach?
For 234 mg/L (13.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Bad Schwalbach?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Bad Schwalbach - Trinkwasseruntersuchungen 2025, Kernstadt und Stadtteile (Gruppe B, Ortsnetze) (2025-09). Method: figure published by the water supplier. Stadtwerke Bad Schwalbach - Trinkwasseruntersuchungen 2025, Kernstadt und Stadtteile (Gruppe B, Ortsnetze) · Outdated figure? Tell us