Water hardness in Rheinstetten
17.2 °dH very hard
Tap water in Rheinstetten is very hard: 17.2 °dH (307 mg/L · 17.9 gpg · 30.7 °fH).
Source: Stadt Rheinstetten – Amtsblatt Nr. 28/2026, Trinkwasserwerte (Probe 13.04.2026) (2026) · data checked 2026-11-02
Range across supply zones: 305–327 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Stadtwerke Karlsruhe (Silberstreifen, Neue Messe, Mörsch) | 18.3 | 327 | very hard |
| Wasserwerk Forchheim (Stadtteil Forchheim) | 17.2 | 307 | very hard |
| Wasserwerk Neuburgweier (Neuburgweier, Teile Tiefgestade Mörsch) | 17.1 | 305 | very hard |
Rheinstetten's official gazette from 2026 (sample of 13 April) lists three supplies: Stadtwerke Karlsruhe at 326.7 mg/L CaCO₃, Wasserwerk Forchheim at 307.0 mg/L and Wasserwerk Neuburgweier at 305.2 mg/L. Calcium is 114 mg/L and magnesium 10.2 mg/L. The differences are small, so the whole town has very hard water.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 17.2 °dH |
|---|---|
| Calcium (mg/L) | 114 |
| Magnesium (mg/L) | 10.2 |
| Utility | Wasserwerke Forchheim/Neuburgweier, Stadtwerke Karlsruhe |
How Rheinstetten compares
- Tap water in Rheinstetten is 50 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 180 of 809 in Germany (1 = hardest); 78 % of these cities have softer water.
- In Baden-Württemberg it is number 35 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Muggensturm, 11 km away (10.2 °dH).
- Nearest city with clearly harder water: Wiesloch, 46 km away (22.3 °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 Rheinstetten
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 17 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S3 |
| 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 Rheinstetten water hard or soft?
It is very hard: 307 mg/L as CaCO₃ (17.9 gpg, 17.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rheinstetten 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 Rheinstetten water?
17.9 gpg, equal to 17.2 °dH, 30.7 °fH or 307 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rheinstetten?
For 307 mg/L (17.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Rheinstetten?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadt Rheinstetten – Amtsblatt Nr. 28/2026, Trinkwasserwerte (Probe 13.04.2026) (2026). Method: figure published by the water supplier. Stadt Rheinstetten – Amtsblatt Nr. 28/2026, Trinkwasserwerte (Probe 13.04.2026) · Outdated figure? Tell us