Water hardness in Suhr
33.9 °fH very hard
Tap water in Suhr is very hard: 33.9 °fH (339 mg/L · 19.8 gpg · 19 °dH).
Source: TBS Wasser AG (via SVGW trinkwasser.ch) (2026) · data checked 2026-10-21
Drinking water in this part of the Swiss Plateau comes mostly from groundwater in the river valleys of the Aare, Limmat and Reuss and from springs in lime-rich rock of the Jura and Plateau. TBS Wasser AG reports a hardness of 339.0 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 | 33.9 °fH |
|---|---|
| Utility | TBS Wasser AG |
How Suhr compares
- Tap water in Suhr is 27 % harder than the median of the 650 cities we track in Switzerland (26.7 °fH).
- By hardness it ranks 121 of 650 in Switzerland (1 = hardest); 81 % of these cities have softer water.
- In AG it is number 42 of 116 cities; the regional median is 32.3 °fH.
- Nearest city with clearly softer water: Unterentfelden, 2 km away (23.3 °fH).
- Nearest city with clearly harder water: Oeschgen, 17 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 Suhr
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °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 Suhr water hard or soft?
It is very hard: 339 mg/L as CaCO₃ (19.8 gpg, 19 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Suhr 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 Suhr water?
19.8 gpg, equal to 19 °dH, 33.9 °fH or 339 mg/L calcium carbonate.
What dishwasher salt setting should I use in Suhr?
For 339 mg/L (19 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Suhr?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: TBS Wasser AG (via SVGW trinkwasser.ch) (2026). Method: figure published by the water supplier. TBS Wasser AG (via SVGW trinkwasser.ch) · Outdated figure? Tell us