Water hardness in Nauheim
18.2 °dH very hard
Tap water in Nauheim is very hard: 18.2 °dH (325 mg/L · 19 gpg · 32.5 °fH).
Source: Wasserwerk Gerauer Land - Trinkwasseranalyse Versorgungsgebiet Büttelborn, Nauheim, Trebur und Groß-Gerau, Stand Juli 2025 (2025-07) · data checked 2026-11-03
The stored value of 18.2 °dH (324.9 mg/L CaCO₃) is an area-wide figure from Zweckverband Wasserwerk Gerauer Land, which covers Büttelborn, Nauheim, Trebur and Groß-Gerau in one analysis dated July 2025. It is not a measurement taken only in Nauheim. The report classes the water as hard.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 18.2 °dH |
|---|---|
| Utility | Zweckverband Wasserwerk Gerauer Land |
How Nauheim compares
- Tap water in Nauheim is 58 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 139 of 809 in Germany (1 = hardest); 83 % of these cities have softer water.
- Nearest city with clearly softer water: Pfungstadt, 12 km away (12 °dH).
- Nearest city with clearly harder water: Limburg an der Lahn, 64 km away (23.3 °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 Nauheim
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °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 Nauheim water hard or soft?
It is very hard: 325 mg/L as CaCO₃ (19 gpg, 18.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Nauheim 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 Nauheim water?
19 gpg, equal to 18.2 °dH, 32.5 °fH or 325 mg/L calcium carbonate.
What dishwasher salt setting should I use in Nauheim?
For 325 mg/L (18.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Nauheim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wasserwerk Gerauer Land - Trinkwasseranalyse Versorgungsgebiet Büttelborn, Nauheim, Trebur und Groß-Gerau, Stand Juli 2025 (2025-07). Method: figure published by the water supplier. Wasserwerk Gerauer Land - Trinkwasseranalyse Versorgungsgebiet Büttelborn, Nauheim, Trebur und Groß-Gerau, Stand Juli 2025 · Outdated figure? Tell us