Water hardness in Trofaiach
10.1 °dH very hard
Tap water in Trofaiach is very hard: 10.1 °dH (180 mg/L · 10.5 gpg · 18 °fH).
Source: Stadtwerke Trofaiach - Die wichtigsten Analysewerte 2026 (2026) · data checked 2026-10-22
Range across supply zones: 117–279 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Gai | 10.1 | 180 | very hard |
| St. Peter-Frst. | 15.6 | 279 | very hard |
| Trofaiach | 6.6 | 117 | moderately hard |
Stadtwerke Trofaiach prints three supply zones in one 2026 table: Trofaiach, Gai and St. Peter-Freienstein. The median is 180.3 mg/L CaCO₃, but the zones run from 117.3 to 278.5 mg/L. The report gives no sampling date. Check which zone your street is in before choosing a descaling or softening setup.
Angabe in °dH; Härtebereiche wie in Deutschland üblich.
Water data
| Total hardness | 10.1 °dH |
|---|---|
| Utility | Stadtwerke Trofaiach |
How Trofaiach compares
- Tap water in Trofaiach is 28 % softer than the median of the 159 cities we track in Austria (14 °dH).
- By hardness it ranks 144 of 159 in Austria (1 = hardest); 9 % of these cities have softer water.
- In Steiermark it is number 7 of 8 cities; the regional median is 13.6 °dH.
- Nearest city with clearly softer water: Mürzzuschlag, 54 km away (5.7 °dH).
- Nearest city with clearly harder water: Kapfenberg, 22 km away (13.5 °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 Trofaiach
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Trofaiach water hard or soft?
It is very hard: 180 mg/L as CaCO₃ (10.5 gpg, 10.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Trofaiach 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 Trofaiach water?
10.5 gpg, equal to 10.1 °dH, 18 °fH or 180 mg/L calcium carbonate.
What dishwasher salt setting should I use in Trofaiach?
For 180 mg/L (10.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Trofaiach?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Trofaiach - Die wichtigsten Analysewerte 2026 (2026). Method: figure published by the water supplier. Stadtwerke Trofaiach - Die wichtigsten Analysewerte 2026 · Outdated figure? Tell us