Water hardness in Bülach
33.2 °fH very hard
Tap water in Bülach is very hard: 33.2 °fH (332 mg/L · 19.4 gpg · 18.6 °dH).
Source: Wasserversorgung Stadt Bülach (via SVGW trinkwasser.ch) (2025) · data checked 2026-10-21
Range across supply zones: 274–390 mg/L.
In the canton of Zurich, drinking water comes partly from Lake Zurich and partly from groundwater and springs, and communities relying mostly on groundwater and springs tend to have harder water. Wasserversorgung Stadt Bülach reports a hardness of 331.8 mg/L CaCO₃, with values from 273.5 to 390.0 mg/L depending on the address. 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 | 33.2 °fH |
|---|---|
| Utility | Wasserversorgung Stadt Bülach |
How Bülach compares
- Tap water in Bülach is 24 % harder than the median of the 650 cities we track in Switzerland (26.7 °fH).
- By hardness it ranks 139 of 650 in Switzerland (1 = hardest); 79 % of these cities have softer water.
- In ZH it is number 29 of 116 cities; the regional median is 28.4 °fH.
- Nearest city with clearly softer water: Oberglatt, 5 km away (21 °fH).
- Nearest city with clearly harder water: Rorbas, 3 km away (44.1 °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 Bülach
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 4 |
| 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 Bülach water hard or soft?
It is very hard: 332 mg/L as CaCO₃ (19.4 gpg, 18.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Bülach 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 Bülach water?
19.4 gpg, equal to 18.6 °dH, 33.2 °fH or 332 mg/L calcium carbonate.
What dishwasher salt setting should I use in Bülach?
For 332 mg/L (18.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Bülach?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wasserversorgung Stadt Bülach (via SVGW trinkwasser.ch) (2025). Method: figure published by the water supplier. Wasserversorgung Stadt Bülach (via SVGW trinkwasser.ch) · Outdated figure? Tell us