Water hardness in Oświęcim
221 mg/L very hard
Tap water in Oświęcim is very hard: 221 mg/L (12.9 gpg · 12.4 °dH · 22.1 °fH).
Source: PWiK Oświęcim – Komunikat o jakości wody, średnie 05.2026 (2026) · data checked 2026-10-29
Range across supply zones: 118–323 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| Zakład uzdatniania Zaborze | 323 | 323 | very hard |
| Zakład uzdatniania Zasole | 118 | 118 | moderately hard |
PWiK Oświęcim's May 2026 notice shows two zones, from 118 to 323 mg/L CaCO₃, with a median of 220.5 mg/L. The difference between zones is large, so your street may be much softer or harder than the median. Check the utility's monthly notice for your supply area.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 221 mg/L |
|---|---|
| Utility | PWiK Oświęcim |
How Oświęcim compares
- Tap water in Oświęcim is 10 % softer than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 60 of 91 in Poland (1 = hardest); 34 % of these cities have softer water.
- In małopolskie it is number 5 of 5 cities; the regional median is 265 mg/L.
- Nearest city with clearly softer water: Mysłowice, 19 km away (112 mg/L).
- Nearest city with clearly harder water: Chrzanów, 18 km away (297 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 Oświęcim
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| 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 Oświęcim water hard or soft?
It is very hard: 221 mg/L as CaCO₃ (12.9 gpg, 12.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Oświęcim 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 Oświęcim water?
12.9 gpg, equal to 12.4 °dH, 22.1 °fH or 221 mg/L calcium carbonate.
What dishwasher salt setting should I use in Oświęcim?
For 221 mg/L (12.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Oświęcim?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: PWiK Oświęcim – Komunikat o jakości wody, średnie 05.2026 (2026). Method: figure published by the water supplier. PWiK Oświęcim – Komunikat o jakości wody, średnie 05.2026 · Outdated figure? Tell us