Water hardness in Heiligenhaus
19.7 °dH very hard
Tap water in Heiligenhaus is very hard: 19.7 °dH (352 mg/L · 20.6 gpg · 35.2 °fH).
Source: Stadtwerke Heiligenhaus, Wasserhärte (Untersuchung aus dem Jahr 2022) (2022) · data checked 2026-10-23
This figure is over 3 years old; hardness may have changed.
Stadtwerke Heiligenhaus prints 3.52 mmol/L of calcium carbonate, which is 352 mg/L CaCO₃ and hard. The figure comes from an examination in 2022, so it is more than three years old and no newer value is on the page. Compare it with your latest annual water notice before buying a softener.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 19.7 °dH |
|---|---|
| Utility | Stadtwerke Heiligenhaus |
How Heiligenhaus compares
- Tap water in Heiligenhaus is 72 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 77 of 809 in Germany (1 = hardest); 91 % of these cities have softer water.
- In Nordrhein-Westfalen it is number 11 of 153 cities; the regional median is 11.3 °dH.
- Nearest city with clearly softer water: Velbert, 5 km away (7.5 °dH).
- Nearest city with clearly harder water: Leopoldshöhe, 144 km away (25.2 °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 Heiligenhaus
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 5th |
| 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 Heiligenhaus water hard or soft?
It is very hard: 352 mg/L as CaCO₃ (20.6 gpg, 19.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Heiligenhaus 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 Heiligenhaus water?
20.6 gpg, equal to 19.7 °dH, 35.2 °fH or 352 mg/L calcium carbonate.
What dishwasher salt setting should I use in Heiligenhaus?
For 352 mg/L (19.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Heiligenhaus?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Heiligenhaus, Wasserhärte (Untersuchung aus dem Jahr 2022) (2022). Method: figure published by the water supplier. Stadtwerke Heiligenhaus, Wasserhärte (Untersuchung aus dem Jahr 2022) · Outdated figure? Tell us