Water hardness in Hürth
10.1 °dH very hard
Tap water in Hürth is very hard: 10.1 °dH (180 mg/L · 10.5 gpg · 18 °fH).
Source: Stadtwerke Hürth AöR, Trinkwasseranalyse 03.04.2025 (2025-04) · data checked 2026-10-20
Stadtwerke Hürth AöR measured 180.3 mg/L CaCO₃ in its drinking-water analysis of 3 April 2025. This is a single dated analysis, not a multi-year average. Limescale still shows on taps and shower screens over time.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 10.1 °dH |
|---|---|
| Utility | Stadtwerke Hürth AöR |
How Hürth compares
- Tap water in Hürth is 12 % softer than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 478 of 809 in Germany (1 = hardest); 41 % of these cities have softer water.
- In Nordrhein-Westfalen it is number 94 of 153 cities; the regional median is 11.3 °dH.
- Nearest city with clearly softer water: Troisdorf, 20 km away (5.4 °dH).
- Nearest city with clearly harder water: Frechen, 5 km away (16.3 °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 Hürth
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| 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 Hürth water hard or soft?
It is very hard: 180 mg/L as CaCO₃ (10.5 gpg, 10.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Hürth 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 Hürth water?
10.5 gpg, equal to 10.1 °dH, 18 °fH or 180 mg/L calcium carbonate.
What dishwasher salt setting should I use in Hürth?
For 180 mg/L (10.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Hürth?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Hürth AöR, Trinkwasseranalyse 03.04.2025 (2025-04). Method: own measurement. Stadtwerke Hürth AöR, Trinkwasseranalyse 03.04.2025 · Outdated figure? Tell us