Water hardness in Dormagen
11.2 °dH very hard
Tap water in Dormagen is very hard: 11.2 °dH (200 mg/L · 11.7 gpg · 20 °fH).
Source: Energieversorgung Dormagen, Wasserhärte Dormagen (web page) (date not specified) · data checked 2026-11-12
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 11.2 °dH |
|---|---|
| Utility | Energieversorgung Dormagen (EVD), Wasserwerk Mühlenbusch |
How Dormagen compares
- Tap water in Dormagen is close to the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 428 of 809 in Germany (1 = hardest); 47 % of these cities have softer water.
- In Nordrhein-Westfalen it is number 82 of 153 cities; the regional median is 11.3 °dH.
- Nearest city with clearly softer water: Leichlingen, 12 km away (4.4 °dH).
- Nearest city with clearly harder water: Pulheim, 14 km away (18.1 °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 Dormagen
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 3 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Dormagen water hard or soft?
It is very hard: 200 mg/L as CaCO₃ (11.7 gpg, 11.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Dormagen 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 Dormagen water?
11.7 gpg, equal to 11.2 °dH, 20 °fH or 200 mg/L calcium carbonate.
What dishwasher salt setting should I use in Dormagen?
For 200 mg/L (11.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Dormagen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Energieversorgung Dormagen, Wasserhärte Dormagen (web page) (date not specified). Method: figure published by the water supplier. Energieversorgung Dormagen, Wasserhärte Dormagen (web page) · Outdated figure? Tell us