Water hardness in Wohlen
35.6 °fH very hard
Tap water in Wohlen is very hard: 35.6 °fH (356 mg/L · 20.8 gpg · 19.9 °dH).
Source: ibw (via SVGW trinkwasser.ch) (2025) · 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. ibw reports a hardness of 355.8 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 | 35.6 °fH |
|---|---|
| Utility | ibw |
How Wohlen compares
- Tap water in Wohlen is 33 % harder than the median of the 650 cities we track in Switzerland (26.7 °fH).
- By hardness it ranks 83 of 650 in Switzerland (1 = hardest); 87 % of these cities have softer water.
- In AG it is number 31 of 116 cities; the regional median is 32.3 °fH.
- Nearest city with clearly softer water: Staufen, 9 km away (27.1 °fH).
- Nearest city with clearly harder water: Oeschgen, 27 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 Wohlen
| 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 Wohlen water hard or soft?
It is very hard: 356 mg/L as CaCO₃ (20.8 gpg, 19.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Wohlen 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 Wohlen water?
20.8 gpg, equal to 19.9 °dH, 35.6 °fH or 356 mg/L calcium carbonate.
What dishwasher salt setting should I use in Wohlen?
For 356 mg/L (19.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Wohlen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: ibw (via SVGW trinkwasser.ch) (2025). Method: figure published by the water supplier. ibw (via SVGW trinkwasser.ch) · Outdated figure? Tell us