Water hardness in Katowice
110 mg/L moderately hard
Tap water in Katowice is moderately hard: 110 mg/L (6.4 gpg · 6.2 °dH · 11 °fH).
Source: Wodociągi Katowice (2026-09) · data checked 2026-10-21
Wodociągi Katowice posts a monthly laboratory report. The September 2026 report gives total hardness of 110 mg/L CaCO₃, well inside the national limit of 60 to 500. The text does not say where the sample was taken or whether it is a network average, so we treat it as one city figure. This is moderate water, much softer than most Polish cities in this dataset, but it can still leave scale on heating elements.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 110 mg/L |
|---|---|
| Utility | Wodociągi Katowice |
How Katowice compares
- Tap water in Katowice is 55 % softer than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 87 of 91 in Poland (1 = hardest); 4 % of these cities have softer water.
- In śląskie it is number 11 of 15 cities; the regional median is 168 mg/L.
- Nearest city with clearly softer water: Czechowice-Dziedzice, 39 km away (85 mg/L).
- Nearest city with clearly harder water: Sosnowiec, 7 km away (168 mg/L).
Ranking of the hardest and softest water in Poland →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Katowice
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Katowice water hard or soft?
It is moderately hard: 110 mg/L as CaCO₃ (6.4 gpg, 6.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Katowice safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
How many grains per gallon is Katowice water?
6.4 gpg, equal to 6.2 °dH, 11 °fH or 110 mg/L calcium carbonate.
What dishwasher salt setting should I use in Katowice?
For 110 mg/L (6.2 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Katowice?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Wodociągi Katowice (2026-09). Method: figure published by the water supplier. Wodociągi Katowice · Outdated figure? Tell us