Water hardness in Mörfelden-Walldorf
12.9 °dH very hard
Tap water in Mörfelden-Walldorf is very hard: 12.9 °dH (229 mg/L · 13.4 gpg · 22.9 °fH).
Source: Stadtwerke Mörfelden-Walldorf, Ausgewählte Inhaltsstoffe im Trinkwasser, Ergebnisse der Trinkwasseruntersuchung 2025 (Labor Fresenius) (2025) · data checked 2026-10-23
Range across supply zones: 229–230 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Wasserwerk Mörfelden | 12.9 | 230 | very hard |
| Wasserwerk Walldorf | 12.8 | 229 | very hard |
Stadtwerke Mörfelden-Walldorf publishes 2025 lab results from Fresenius for two works. Mörfelden shows 12.9 °dH (2.3 mmol/l, sampled 17 March 2025) and Walldorf shows 12.8 °dH (2.28 mmol/l, sampled 15 September 2025). Both are medium and are single samples, so the two districts differ very little.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 12.9 °dH |
|---|---|
| Utility | Stadtwerke Mörfelden-Walldorf |
How Mörfelden-Walldorf compares
- Tap water in Mörfelden-Walldorf is 12 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 344 of 809 in Germany (1 = hardest); 58 % of these cities have softer water.
- In Hessen it is number 27 of 73 cities; the regional median is 10.7 °dH.
- Nearest city with clearly softer water: Eppstein, 21 km away (6.7 °dH).
- Nearest city with clearly harder water: Weiterstadt, 5 km away (19 °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 Mörfelden-Walldorf
| 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 Mörfelden-Walldorf water hard or soft?
It is very hard: 229 mg/L as CaCO₃ (13.4 gpg, 12.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mörfelden-Walldorf 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 Mörfelden-Walldorf water?
13.4 gpg, equal to 12.9 °dH, 22.9 °fH or 229 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mörfelden-Walldorf?
For 229 mg/L (12.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mörfelden-Walldorf?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Mörfelden-Walldorf, Ausgewählte Inhaltsstoffe im Trinkwasser, Ergebnisse der Trinkwasseruntersuchung 2025 (Labor Fresenius) (2025). Method: figure published by the water supplier. Stadtwerke Mörfelden-Walldorf, Ausgewählte Inhaltsstoffe im Trinkwasser, Ergebnisse der Trinkwasseruntersuchung 2025 (Labor Fresenius) · Outdated figure? Tell us