Water hardness in Wülfrath
8.2 °dH hard
Tap water in Wülfrath is hard: 8.2 °dH (146 mg/L · 8.6 gpg · 14.6 °fH).
Source: RWW, Trinkwasserdaten 2025 (2025) · data checked 2026-10-20
Range across supply zones: 105–173 mg/L.
RWW's 2025 data reports 146.4 mg/L CaCO₃ for Wülfrath, in the hard category. The range runs from 105.3 to 173.1 mg/L, so the exact value depends on the supply area. Ask RWW or check its analysis for your street.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 8.2 °dH |
|---|
How Wülfrath compares
- Tap water in Wülfrath is 29 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 563 of 809 in Germany (1 = hardest); 30 % of these cities have softer water.
- In Nordrhein-Westfalen it is number 109 of 153 cities; the regional median is 11.3 °dH.
- Nearest city with clearly softer water: Wuppertal, 8 km away (5.5 °dH).
- Nearest city with clearly harder water: Mettmann, 6 km away (15 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Wülfrath
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
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 Wülfrath water hard or soft?
It is hard: 146 mg/L as CaCO₃ (8.6 gpg, 8.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Wülfrath 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 Wülfrath water?
8.6 gpg, equal to 8.2 °dH, 14.6 °fH or 146 mg/L calcium carbonate.
What dishwasher salt setting should I use in Wülfrath?
For 146 mg/L (8.2 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Wülfrath?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: RWW, Trinkwasserdaten 2025 (2025). Method: figure published by the water supplier. RWW, Trinkwasserdaten 2025 · Outdated figure? Tell us