Water hardness in Davos
9.4 °fH moderately hard
Tap water in Davos is moderately hard: 9.4 °fH (94 mg/L · 5.5 gpg · 5.3 °dH).
Source: Gemeinde Davos Wasserversorgung; Trinkwasser-Genossenschaft Davos Laret; Wasserversorgung Stiftung Kliniken Valens, Rehazentrum Davos Clavadel (via SVGW trinkwasser.ch) (2026) · data checked 2026-10-21
Range across supply zones: 3–205 mg/L.
In Graubünden, drinking water comes from springs and groundwater, and the hardness depends strongly on the catchment rock: crystalline rock gives soft water, limestone and dolomite hard water. Gemeinde Davos Wasserversorgung reports a hardness of 94.0 mg/L CaCO₃, with values from 3.1 to 205.0 mg/L depending on the address. Scale shows up over time on kettles and shower screens, and regular descaling is usually enough.
In der Schweiz wird meist in °fH angegeben (1 °fH = 0,56 °dH).
Water data
| Total hardness | 9.4 °fH |
|---|---|
| Utility | Gemeinde Davos Wasserversorgung |
How Davos compares
- Tap water in Davos is 65 % softer than the median of the 650 cities we track in Switzerland (26.7 °fH).
- By hardness it ranks 626 of 650 in Switzerland (1 = hardest); 4 % of these cities have softer water.
- In GR it is number 12 of 16 cities; the regional median is 14.7 °fH.
- Nearest city with clearly softer water: Zernez, 23 km away (3.2 °fH).
- Nearest city with clearly harder water: Chur, 24 km away (18.1 °fH).
Ranking of the hardest and softest water in Switzerland →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Davos
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Davos water hard or soft?
It is moderately hard: 94 mg/L as CaCO₃ (5.5 gpg, 5.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Davos 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 Davos water?
5.5 gpg, equal to 5.3 °dH, 9.4 °fH or 94 mg/L calcium carbonate.
What dishwasher salt setting should I use in Davos?
For 94 mg/L (5.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Davos?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Gemeinde Davos Wasserversorgung; Trinkwasser-Genossenschaft Davos Laret; Wasserversorgung Stiftung Kliniken Valens, Rehazentrum Davos Clavadel (via SVGW trinkwasser.ch) (2026). Method: figure published by the water supplier. Gemeinde Davos Wasserversorgung; Trinkwasser-Genossenschaft Davos Laret; Wasserversorgung Stiftung Kliniken Valens, Rehazentrum Davos Clavadel (via SVGW trinkwasser.ch) · Outdated figure? Tell us