Water hardness in Sosnowiec
168 mg/L hard
Tap water in Sosnowiec is hard: 168 mg/L (9.8 gpg · 9.4 °dH · 16.8 °fH).
Source: Sosnowieckie Wodociągi S.A. (2026-09) · data checked 2026-10-21
Range across supply zones: 89–246 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| Goczałkowice intake | 89 | 89 | moderately hard |
| Maczki intake | 246 | 246 | very hard |
Sosnowieckie Wodociągi publishes monthly laboratory reports per intake. In September 2026 the Maczki intake measured 246 mg/L CaCO₃ and the Goczałkowice intake measured 89 mg/L. The 167.5 mg/L shown is simply the midpoint of those two, not a weighted average. The utility does not say which streets get which water, so the tap in your home could be close to either figure.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 168 mg/L |
|---|---|
| Utility | Sosnowieckie Wodociągi S.A. |
How Sosnowiec compares
- Tap water in Sosnowiec is 32 % softer than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 80 of 91 in Poland (1 = hardest); 12 % of these cities have softer water.
- In śląskie it is number 8 of 15 cities; the regional median is 168 mg/L.
- Nearest city with clearly softer water: Katowice, 7 km away (110 mg/L).
- Nearest city with clearly harder water: Będzin, 5 km away (230 mg/L).
Ranking of the hardest and softest water in Poland →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Sosnowiec
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Sosnowiec water hard or soft?
It is hard: 168 mg/L as CaCO₃ (9.8 gpg, 9.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sosnowiec 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 Sosnowiec water?
9.8 gpg, equal to 9.4 °dH, 16.8 °fH or 168 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sosnowiec?
For 168 mg/L (9.4 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Sosnowiec?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Sosnowieckie Wodociągi S.A. (2026-09). Method: own measurement. Sosnowieckie Wodociągi S.A. · Outdated figure? Tell us