Water hardness in Ruda Śląska
92 mg/L moderately hard
Tap water in Ruda Śląska is moderately hard: 92 mg/L (5.4 gpg · 5.2 °dH · 9.2 °fH).
Source: PWiK Ruda Śląska: Jaką mam wodę? (state of 12.10.2026) (2026-10) · data checked 2026-10-23
Range across supply zones: 75–270 mg/L.
15 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| water zone 1 | 270 | 270 | very hard |
| water zone 10 | 86 | 86 | moderately hard |
| water zone 11 | 100 | 100 | moderately hard |
| water zone 12 | 86 | 86 | moderately hard |
| water zone 13 | 250 | 250 | very hard |
| water zone 14 | 91 | 91 | moderately hard |
| water zone 15 | 77 | 77 | moderately hard |
| water zone 2 | 270 | 270 | very hard |
| water zone 3 | 86 | 86 | moderately hard |
| water zone 4 | 75 | 75 | moderately hard |
| water zone 5 | 85 | 85 | moderately hard |
| water zone 6 | 240 | 240 | very hard |
| water zone 7 | 92 | 92 | moderately hard |
| water zone 8 | 92 | 92 | moderately hard |
| water zone 9 | 100 | 100 | moderately hard |
Public supply in this part of Poland draws largely on groundwater from limestone- and carbonate-bearing glacial and older deposits, which tends to give hard water. The figure shown, 92.0 mg/L CaCO₃, is the median across 15 supply zones, which range from 75.0 to 270.0 mg/L, so it depends on which zone your street is in. Kettles and shower screens collect some limescale over time, and regular descaling is usually enough.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 92 mg/L |
|---|---|
| Utility | PWiK Sp. z o.o. Ruda Śląska |
How Ruda Śląska compares
- Tap water in Ruda Śląska is 62 % softer than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 89 of 91 in Poland (1 = hardest); 2 % of these cities have softer water.
- In śląskie it is number 13 of 15 cities; the regional median is 168 mg/L.
- Nearest city with clearly harder water: Zabrze, 9 km away (369 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 Ruda Śląska
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °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 Ruda Śląska water hard or soft?
It is moderately hard: 92 mg/L as CaCO₃ (5.4 gpg, 5.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ruda Śląska 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 Ruda Śląska water?
5.4 gpg, equal to 5.2 °dH, 9.2 °fH or 92 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ruda Śląska?
For 92 mg/L (5.2 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Ruda Śląska?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: PWiK Ruda Śląska: Jaką mam wodę? (state of 12.10.2026) (2026-10). Method: figure published by the water supplier. PWiK Ruda Śląska: Jaką mam wodę? (state of 12.10.2026) · Outdated figure? Tell us