Water hardness in Leszno
337 mg/L very hard
Tap water in Leszno is very hard: 337 mg/L (19.7 gpg · 18.9 °dH · 33.7 °fH).
Source: Wodociągi Leszczyńskie – Komunikat o jakości wody II półrocze 2025 (2025) · data checked 2026-10-29
Range across supply zones: 331–361 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| SUW Karczma Borowa | 337 | 337 | very hard |
| SUW Strzyżewice | 331 | 331 | very hard |
| SUW Zaborowo | 361 | 361 | very hard |
Wodociągi Leszczyńskie reports a hardness of 337 mg/L CaCO₃ for Leszno in its second-half 2025 water quality notice, which places the town in the very hard band. Three supply zones are listed, with values between 331 and 361 mg/L, so the difference between districts is small. Expect heavy scale in kettles and heating elements; the notice does not say which aquifer feeds the network.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 337 mg/L |
|---|---|
| Utility | Wodociągi Leszczyńskie Sp. z o.o. |
How Leszno compares
- Tap water in Leszno is 38 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 10 of 91 in Poland (1 = hardest); 90 % of these cities have softer water.
- In wielkopolskie it is number 2 of 5 cities; the regional median is 320 mg/L.
- Nearest city with clearly softer water: Głogów, 39 km away (245 mg/L).
- Nearest city with clearly harder water: Oleśnica, 90 km away (445 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 Leszno
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| 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 Leszno water hard or soft?
It is very hard: 337 mg/L as CaCO₃ (19.7 gpg, 18.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Leszno 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 Leszno water?
19.7 gpg, equal to 18.9 °dH, 33.7 °fH or 337 mg/L calcium carbonate.
What dishwasher salt setting should I use in Leszno?
For 337 mg/L (18.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Leszno?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wodociągi Leszczyńskie – Komunikat o jakości wody II półrocze 2025 (2025). Method: figure published by the water supplier. Wodociągi Leszczyńskie – Komunikat o jakości wody II półrocze 2025 · Outdated figure? Tell us