Water hardness in Gossau (SG)
36.2 °fH very hard
Tap water in Gossau (SG) is very hard: 36.2 °fH (362 mg/L · 21.1 gpg · 20.3 °dH).
Source: Stadtwerke Gossau (via SVGW trinkwasser.ch) (2025) · data checked 2026-10-21
In eastern Switzerland, drinking water comes from groundwater, hill springs and in places lake water, depending on the supply area. Stadtwerke Gossau reports a hardness of 362.0 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 | 36.2 °fH |
|---|---|
| Utility | Stadtwerke Gossau |
How Gossau (SG) compares
- Tap water in Gossau (SG) is 35 % harder than the median of the 650 cities we track in Switzerland (26.7 °fH).
- By hardness it ranks 71 of 650 in Switzerland (1 = hardest); 89 % of these cities have softer water.
- In SG it is number 8 of 51 cities; the regional median is 25.3 °fH.
- Nearest city with clearly softer water: Degersheim, 6 km away (27.4 °fH).
- Nearest city with clearly harder water: Oeschgen, 94 km away (52.2 °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 Gossau
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| 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 Gossau (SG) water hard or soft?
It is very hard: 362 mg/L as CaCO₃ (21.1 gpg, 20.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Gossau (SG) 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 Gossau (SG) water?
21.1 gpg, equal to 20.3 °dH, 36.2 °fH or 362 mg/L calcium carbonate.
What dishwasher salt setting should I use in Gossau (SG)?
For 362 mg/L (20.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Gossau (SG)?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Gossau (via SVGW trinkwasser.ch) (2025). Method: figure published by the water supplier. Stadtwerke Gossau (via SVGW trinkwasser.ch) · Outdated figure? Tell us