Water hardness in Zabrze
369 mg/L very hard
Tap water in Zabrze is very hard: 369 mg/L (21.6 gpg · 20.7 °dH · 36.9 °fH).
Source: ZPWiK Zabrze BIP: water quality supplied to network, September 2026 (2026-09) · data checked 2026-10-23
Range across supply zones: 93–436 mg/L.
4 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| GPW (surface water plant) | 93 | 93 | moderately hard |
| Mixed water zone | 428 | 428 | very hard |
| SUW Mikulczyce | 436 | 436 | very hard |
| SUW Zawada | 310 | 310 | very 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, 369.0 mg/L CaCO₃, is the median across 4 supply zones, which range from 93.0 to 436.0 mg/L, so it depends on which zone your street is in. Limescale builds quickly in kettles, boilers and washing machines, so frequent descaling or a softener is worth considering.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 369 mg/L |
|---|---|
| Utility | Zabrzańskie Przedsiębiorstwo Wodociągów i Kanalizacji Sp. z o.o. (ZPWiK) |
How Zabrze compares
- Tap water in Zabrze is 51 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 6 of 91 in Poland (1 = hardest); 94 % of these cities have softer water.
- In śląskie it is number 1 of 15 cities; the regional median is 168 mg/L.
- Nearest city with clearly softer water: Ruda Śląska, 9 km away (92 mg/L).
Ranking of the hardest and softest water in Poland →
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 Zabrze
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 21 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| 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 Zabrze water hard or soft?
It is very hard: 369 mg/L as CaCO₃ (21.6 gpg, 20.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Zabrze 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 Zabrze water?
21.6 gpg, equal to 20.7 °dH, 36.9 °fH or 369 mg/L calcium carbonate.
What dishwasher salt setting should I use in Zabrze?
For 369 mg/L (20.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Zabrze?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: ZPWiK Zabrze BIP: water quality supplied to network, September 2026 (2026-09). Method: figure published by the water supplier. ZPWiK Zabrze BIP: water quality supplied to network, September 2026 · Outdated figure? Tell us