Water hardness in Haan
5.4 °dH moderately hard
Tap water in Haan is moderately hard: 5.4 °dH (96 mg/L · 5.6 gpg · 9.6 °fH).
Source: Stadtwerke Haan Trinkwasseranalyse (Jahresmittelwerte 2024) (2024) · data checked 2026-10-23
Stadtwerke Haan publishes annual mean values for 2024, and the city figure is 96.4 mg/L CaCO₃. That is the moderate category. Hilden (196.4 mg/L) and Mettmann (267.8 mg/L) lie only 5 to 8 km away and are much harder, while Wuppertal (98.2 mg/L) is close to Haan. The utility data lists no separate zones, so this is one figure for the town.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 5.4 °dH |
|---|---|
| Utility | Stadtwerke Haan GmbH |
How Haan compares
- Tap water in Haan is 53 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 721 of 809 in Germany (1 = hardest); 11 % of these cities have softer water.
- In Nordrhein-Westfalen it is number 138 of 153 cities; the regional median is 11.3 °dH.
- Nearest city with clearly softer water: Sprockhövel, 21 km away (3.5 °dH).
- Nearest city with clearly harder water: Hilden, 5 km away (11 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Haan
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Haan water hard or soft?
It is moderately hard: 96 mg/L as CaCO₃ (5.6 gpg, 5.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Haan 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 Haan water?
5.6 gpg, equal to 5.4 °dH, 9.6 °fH or 96 mg/L calcium carbonate.
What dishwasher salt setting should I use in Haan?
For 96 mg/L (5.4 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Haan?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Stadtwerke Haan Trinkwasseranalyse (Jahresmittelwerte 2024) (2024). Method: figure published by the water supplier. Stadtwerke Haan Trinkwasseranalyse (Jahresmittelwerte 2024) · Outdated figure? Tell us