Water hardness in Weinheim
15.1 °dH very hard
Tap water in Weinheim is very hard: 15.1 °dH (270 mg/L · 15.7 gpg · 26.9 °fH).
Source: Wasserzweckverband Badische Bergstraße (WZV), Trinkwasseranalyse (2025-04) · data checked 2026-10-23
Weinheim's water comes from the Wasserzweckverband Badische Bergstraße (WZV), and Stadtwerke Weinheim distributes it. We use the WZV analysis of April 2025, which gives 269.5 mg/L CaCO₃. We have matched this to the town through the association, so the value for your tap may differ slightly. It is in the very hard band, below Mannheim at 357.0 mg/L, and worth confirming with Stadtwerke Weinheim.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 15.1 °dH |
|---|---|
| Utility | Stadtwerke Weinheim (SWW); water from Wasserzweckverband Badische Bergstraße (WZV) |
How Weinheim compares
- Tap water in Weinheim is 31 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 254 of 809 in Germany (1 = hardest); 69 % of these cities have softer water.
- In Baden-Württemberg it is number 55 of 146 cities; the regional median is 12.8 °dH.
- Nearest city with clearly softer water: Lützelbach, 23 km away (4.4 °dH).
- Nearest city with clearly harder water: Hirschberg an der Bergstraße, 4 km away (22.2 °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 Weinheim
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| 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 Weinheim water hard or soft?
It is very hard: 270 mg/L as CaCO₃ (15.7 gpg, 15.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Weinheim 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 Weinheim water?
15.7 gpg, equal to 15.1 °dH, 26.9 °fH or 270 mg/L calcium carbonate.
What dishwasher salt setting should I use in Weinheim?
For 270 mg/L (15.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Weinheim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wasserzweckverband Badische Bergstraße (WZV), Trinkwasseranalyse (2025-04). Method: figure published by the water supplier. Wasserzweckverband Badische Bergstraße (WZV), Trinkwasseranalyse · Outdated figure? Tell us