Water hardness in Rybnik
100 mg/L moderately hard
Tap water in Rybnik is moderately hard: 100 mg/L (5.8 gpg · 5.6 °dH · 10 °fH).
Source: PWiK Rybnik - Tabela twardości wody (per district) (date not specified) · data checked 2026-11-12
Range across supply zones: 90–280 mg/L.
32 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| Boguszowice Osiedle | 100 | 100 | moderately hard |
| Boguszowice Stare | 100 | 100 | moderately hard |
| Chwałowice | 90 | 90 | moderately hard |
| Chwałęcice | 150 | 150 | hard |
| Czernica | 100 | 100 | moderately hard |
| Gaszowice | 90 | 90 | moderately hard |
| Golejów | 160 | 160 | hard |
| Gotartowice | 100 | 100 | moderately hard |
| Grabownia | 160 | 160 | hard |
| Jejkowice | 90 | 90 | moderately hard |
| Kamień | 100 | 100 | moderately hard |
| Kłokocin | 100 | 100 | moderately hard |
| Ligota | 100 | 100 | moderately hard |
| Maroko Nowiny | 135 | 135 | hard |
| Meksyk | 100 | 100 | moderately hard |
| Niedobczyce | 100 | 100 | moderately hard |
| Niewiadom | 100 | 100 | moderately hard |
| Ochojec | 180 | 180 | very hard |
| Orzepowice | 160 | 160 | hard |
| Paruszowiec Piaski | 100 | 100 | moderately hard |
| Popielów | 100 | 100 | moderately hard |
| Północ | 125 | 125 | hard |
| Radziejów | 100 | 100 | moderately hard |
| Rybnicka Kuźnia | 170 | 170 | hard |
| Smolna | 210 | 210 | very hard |
| Stodoły | 150 | 150 | hard |
| Szczerbice | 100 | 100 | moderately hard |
| Wielopole | 150 | 150 | hard |
| Zamysłów | 190 | 190 | very hard |
| Zebrzydowice | 110 | 110 | moderately hard |
| Łuków | 100 | 100 | moderately hard |
| Śródmieście | 190 | 190 | very hard |
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 100 mg/L |
|---|---|
| Utility | PWiK Rybnik Sp. z o.o. (pwik-rybnik.pl) |
How Rybnik compares
- Tap water in Rybnik is 59 % softer than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 88 of 91 in Poland (1 = hardest); 3 % of these cities have softer water.
- In śląskie it is number 12 of 15 cities; the regional median is 168 mg/L.
- Nearest city with clearly harder water: Tychy, 31 km away (175 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 Rybnik
| 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 Rybnik water hard or soft?
It is moderately hard: 100 mg/L as CaCO₃ (5.8 gpg, 5.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rybnik 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 Rybnik water?
5.8 gpg, equal to 5.6 °dH, 10 °fH or 100 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rybnik?
For 100 mg/L (5.6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Rybnik?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: PWiK Rybnik - Tabela twardości wody (per district) (date not specified). Method: figure published by the water supplier. PWiK Rybnik - Tabela twardości wody (per district) · Outdated figure? Tell us