Water hardness in Kraków
306 mg/L very hard
Tap water in Kraków is very hard: 306 mg/L (17.9 gpg · 17.1 °dH · 30.6 °fH).
Source: Wodociągi Miasta Krakowa S.A. (2026-05) · data checked 2026-10-21
Range across supply zones: 139–315 mg/L.
4 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| ZUW Bielany | 312 | 312 | very hard |
| ZUW Dłubnia | 300 | 300 | very hard |
| ZUW Raba | 139 | 139 | hard |
| ZUW Rudawa | 315 | 315 | very hard |
Wodociągi Miasta Krakowa publishes average hardness for each of its four treatment plants, for March to May 2026. ZUW Raba is the soft outlier at 139 mg/L CaCO₃, while Rudawa, Dłubnia and Bielany sit between 300 and 315 mg/L. The city median is 306 mg/L, but your tap value depends on which plant feeds your area. The page carries no publication date, so the figure is tied to the averaging period.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 306 mg/L |
|---|---|
| Utility | Wodociągi Miasta Krakowa S.A. |
How Kraków compares
- Tap water in Kraków is 25 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 15 of 91 in Poland (1 = hardest); 84 % of these cities have softer water.
- In małopolskie it is number 1 of 5 cities; the regional median is 265 mg/L.
- Nearest city with clearly softer water: Oświęcim, 52 km away (221 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 Kraków
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 17 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| 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 Kraków water hard or soft?
It is very hard: 306 mg/L as CaCO₃ (17.9 gpg, 17.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Kraków 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 Kraków water?
17.9 gpg, equal to 17.1 °dH, 30.6 °fH or 306 mg/L calcium carbonate.
What dishwasher salt setting should I use in Kraków?
For 306 mg/L (17.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Kraków?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wodociągi Miasta Krakowa S.A. (2026-05). Method: figure published by the water supplier. Wodociągi Miasta Krakowa S.A. · Outdated figure? Tell us