Water hardness in Mühlheim am Main (Hessen)
17 °dH very hard
Tap water in Mühlheim am Main (Hessen) is very hard: 17 °dH (304 mg/L · 17.7 gpg · 30.4 °fH).
Source: Stadtwerke Mühlheim am Main Trinkwasseranalyse Mühlheim und Dietesheim, Stand 2025 (2025) · data checked 2026-10-23
Stadtwerke Mühlheim am Main prints hardness range 3 (hard) and 17 °dH, or 303.4 mg/L CaCO₃, for Mühlheim and Dietesheim in its 2025 analysis. The same report sums calcium and magnesium to 18.2 °dH, so the true value is slightly higher. Lämmerspiel has a separate report that is not included here.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 17 °dH |
|---|---|
| Utility | Stadtwerke Mühlheim am Main GmbH |
How Mühlheim am Main (Hessen) compares
- Tap water in Mühlheim am Main (Hessen) is 48 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 186 of 809 in Germany (1 = hardest); 77 % of these cities have softer water.
- In Hessen it is number 20 of 73 cities; the regional median is 10.7 °dH.
- Nearest city with clearly softer water: Mühlheim am Main, 1 km away (13.1 °dH).
- Nearest city with clearly harder water: Rüsselsheim am Main, 34 km away (22.4 °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 Mühlheim am Main
| 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 Mühlheim am Main (Hessen) water hard or soft?
It is very hard: 304 mg/L as CaCO₃ (17.7 gpg, 17 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mühlheim am Main (Hessen) 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 Mühlheim am Main (Hessen) water?
17.7 gpg, equal to 17 °dH, 30.4 °fH or 304 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mühlheim am Main (Hessen)?
For 304 mg/L (17 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mühlheim am Main (Hessen)?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Mühlheim am Main Trinkwasseranalyse Mühlheim und Dietesheim, Stand 2025 (2025). Method: figure published by the water supplier. Stadtwerke Mühlheim am Main Trinkwasseranalyse Mühlheim und Dietesheim, Stand 2025 · Outdated figure? Tell us