Water hardness in Ober-Mörlen
12.2 °dH very hard
Tap water in Ober-Mörlen is very hard: 12.2 °dH (218 mg/L · 12.7 gpg · 21.8 °fH).
Source: TZW Technologiezentrum Wasser Karlsruhe Prüfbericht Nr. 000371844 (Reinwasserprobe Gemeinde Ober-Mörlen 2026) (2026-03) · data checked 2026-11-06
The treated-water sample for Ober-Mörlen (TZW Karlsruhe, March 2026) shows 217.8 mg/L (12.2 °dH), computed from the measured calcium and magnesium values. It is a single sampling point; the municipality lists its water as supplied via OVAG, and differences within the network are not documented. This falls in the medium band (8.4–14 °dH).
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 12.2 °dH |
|---|---|
| Utility | Gemeinde Ober-Mörlen (Wasserversorgung, Wasser vom OVAG) |
How Ober-Mörlen compares
- Tap water in Ober-Mörlen is 6 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 376 of 809 in Germany (1 = hardest); 53 % of these cities have softer water.
- In Hessen it is number 30 of 73 cities; the regional median is 10.7 °dH.
- Nearest city with clearly softer water: Usingen, 12 km away (6.7 °dH).
- Nearest city with clearly harder water: Altenstadt, 20 km away (18.2 °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 Ober-Mörlen
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 12 °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 Ober-Mörlen water hard or soft?
It is very hard: 218 mg/L as CaCO₃ (12.7 gpg, 12.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ober-Mörlen 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 Ober-Mörlen water?
12.7 gpg, equal to 12.2 °dH, 21.8 °fH or 218 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ober-Mörlen?
For 218 mg/L (12.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Ober-Mörlen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: TZW Technologiezentrum Wasser Karlsruhe Prüfbericht Nr. 000371844 (Reinwasserprobe Gemeinde Ober-Mörlen 2026) (2026-03). Method: computed from supplier's calcium and magnesium. TZW Technologiezentrum Wasser Karlsruhe Prüfbericht Nr. 000371844 (Reinwasserprobe Gemeinde Ober-Mörlen 2026) · Outdated figure? Tell us