Water hardness in Küsnacht
20.1 °fH very hard
Tap water in Küsnacht is very hard: 20.1 °fH (201 mg/L · 11.7 gpg · 11.3 °dH).
Source: Werke am Zürichsee AG (via SVGW trinkwasser.ch) (2024) · data checked 2026-10-21
The municipality lies on Lake Zurich, and part of the drinking water in the lakeside communities is treated lake water, the rest groundwater and spring water. Werke am Zürichsee AG reports a hardness of 201.0 mg/L CaCO₃. Scale forms quickly on heating elements and fittings, so a softener or strict descaling routine is worth considering.
In der Schweiz wird meist in °fH angegeben (1 °fH = 0,56 °dH).
Water data
| Total hardness | 20.1 °fH |
|---|---|
| Utility | Werke am Zürichsee AG |
How Küsnacht compares
- Tap water in Küsnacht is 25 % softer than the median of the 650 cities we track in Switzerland (26.7 °fH).
- By hardness it ranks 493 of 650 in Switzerland (1 = hardest); 24 % of these cities have softer water.
- In ZH it is number 103 of 116 cities; the regional median is 28.4 °fH.
- Nearest city with clearly softer water: Zumikon, 3 km away (15.2 °fH).
- Nearest city with clearly harder water: Kilchberg, 3 km away (27.3 °fH).
Ranking of the hardest and softest water in Switzerland →
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 Küsnacht
| 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 Küsnacht water hard or soft?
It is very hard: 201 mg/L as CaCO₃ (11.7 gpg, 11.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Küsnacht safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. In der Schweiz wird meist in °fH angegeben (1 °fH = 0,56 °dH).
How many grains per gallon is Küsnacht water?
11.7 gpg, equal to 11.3 °dH, 20.1 °fH or 201 mg/L calcium carbonate.
What dishwasher salt setting should I use in Küsnacht?
For 201 mg/L (11.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Küsnacht?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Werke am Zürichsee AG (via SVGW trinkwasser.ch) (2024). Method: figure published by the water supplier. Werke am Zürichsee AG (via SVGW trinkwasser.ch) · Outdated figure? Tell us