Water hardness in Durmersheim
15.4 °dH very hard
Tap water in Durmersheim is very hard: 15.4 °dH (275 mg/L · 16.1 gpg · 27.5 °fH).
Source: Gemeinde Durmersheim, Trinkwasseranalyse 2025 (Jahresmittelwerte 2025) (2025-08) · data checked 2026-11-03
Range across supply zones: 216–334 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Fremdbezug von SW Karlsruhe an Wasserwerk Rheinwald | 18.7 | 334 | very hard |
| Wasserwerk Winkelsloh | 12.1 | 216 | very hard |
Durmersheim has two supply zones in the municipality's 2025 analysis (annual means). The Wasserwerk Winkelsloh zone shows 12.1 °dH, classed as medium, while water bought from Stadtwerke Karlsruhe via the Wasserwerk Rheinwald shows 18.7 °dH, classed as hard. The difference is about 6.6 °dH, so the zone serving your street matters more than a single town figure. The published analysis gives one annual mean per zone and no range.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 15.4 °dH |
|---|---|
| Utility | Gemeinde Durmersheim (Wasserversorgung) |
How Durmersheim compares
- Tap water in Durmersheim is 34 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 246 of 809 in Germany (1 = hardest); 70 % of these cities have softer water.
- In Baden-Württemberg it is number 52 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Muggensturm, 5 km away (10.2 °dH).
- Nearest city with clearly harder water: Vaihingen an der Enz, 45 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 Durmersheim
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| 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 Durmersheim water hard or soft?
It is very hard: 275 mg/L as CaCO₃ (16.1 gpg, 15.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Durmersheim 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 Durmersheim water?
16.1 gpg, equal to 15.4 °dH, 27.5 °fH or 275 mg/L calcium carbonate.
What dishwasher salt setting should I use in Durmersheim?
For 275 mg/L (15.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Durmersheim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Gemeinde Durmersheim, Trinkwasseranalyse 2025 (Jahresmittelwerte 2025) (2025-08). Method: figure published by the water supplier. Gemeinde Durmersheim, Trinkwasseranalyse 2025 (Jahresmittelwerte 2025) · Outdated figure? Tell us