Water hardness in Klagenfurt
18.5 °dH very hard
Tap water in Klagenfurt is very hard: 18.5 °dH (330 mg/L · 19.3 gpg · 33 °fH).
Source: Stadtwerke Klagenfurt (stw.at) water quality page (2026) · data checked 2026-10-20
Range across supply zones: 304–357 mg/L.
Stadtwerke Klagenfurt publishes certificates per facility, and the city value of 330.2 mg/L CaCO₃ is computed from them. The facilities range from 303.5 to 357.0 mg/L, a fairly narrow band. Expect heavy limescale on heating elements and glass throughout the supply area.
Angabe in °dH; Härtebereiche wie in Deutschland üblich.
Water data
| Total hardness | 18.5 °dH |
|---|
How Klagenfurt compares
- Tap water in Klagenfurt is 32 % harder than the median of the 159 cities we track in Austria (14 °dH).
- By hardness it ranks 10 of 159 in Austria (1 = hardest); 93 % of these cities have softer water.
- In Kärnten it is number 1 of 4 cities; the regional median is 11.5 °dH.
- Nearest city with clearly softer water: Feldkirchen in Kärnten, 19 km away (8.6 °dH).
Ranking of the hardest and softest water in Austria →
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 Klagenfurt
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °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 Klagenfurt water hard or soft?
It is very hard: 330 mg/L as CaCO₃ (19.3 gpg, 18.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Klagenfurt safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Angabe in °dH; Härtebereiche wie in Deutschland üblich.
How many grains per gallon is Klagenfurt water?
19.3 gpg, equal to 18.5 °dH, 33 °fH or 330 mg/L calcium carbonate.
What dishwasher salt setting should I use in Klagenfurt?
For 330 mg/L (18.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Klagenfurt?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Klagenfurt (stw.at) water quality page (2026). Method: computed from supplier's calcium and magnesium. Stadtwerke Klagenfurt (stw.at) water quality page · Outdated figure? Tell us