Water hardness in Mannheim
20 °dH very hard
Tap water in Mannheim is very hard: 20 °dH (357 mg/L · 20.9 gpg · 35.7 °fH).
Source: MVV Energie AG - Bekanntmachung Trinkwasser (WRMG Gesamthärte) (2024) · data checked 2026-10-19
MVV Energie publishes a single hardness value for Mannheim and Brühl in its drinking water notice under the WRMG, dated 2024. It is 357.0 mg/L CaCO₃, which is hard by German classification, and no zone range is given. Expect heavy limescale and plan for it when choosing appliances.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 20 °dH |
|---|---|
| Utility | MVV Energie AG (MVV Netze) |
How Mannheim compares
- Tap water in Mannheim is 74 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 67 of 809 in Germany (1 = hardest); 91 % of these cities have softer water.
- In Baden-Württemberg it is number 13 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Ludwigshafen am Rhein, 2 km away (12.6 °dH).
- Nearest city with clearly harder water: Nußloch, 26 km away (31.6 °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 Mannheim
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| 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 Mannheim water hard or soft?
It is very hard: 357 mg/L as CaCO₃ (20.9 gpg, 20 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Mannheim 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 Mannheim water?
20.9 gpg, equal to 20 °dH, 35.7 °fH or 357 mg/L calcium carbonate.
What dishwasher salt setting should I use in Mannheim?
For 357 mg/L (20 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Mannheim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: MVV Energie AG - Bekanntmachung Trinkwasser (WRMG Gesamthärte) (2024). Method: figure published by the water supplier. MVV Energie AG - Bekanntmachung Trinkwasser (WRMG Gesamthärte) · Outdated figure? Tell us