Water hardness in Legionowo
240 mg/L very hard
Tap water in Legionowo is very hard: 240 mg/L (14 gpg · 13.4 °dH · 24 °fH).
Source: PWK Legionowo – Wyniki analiz II kwartał 2026 (2026) · data checked 2026-10-29
Range across supply zones: 240–310 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 Jagiellońska (Centrum, Jagiellońska, Sobieskiego, Batorego, Bukowiec) | 240 | 240 | very hard |
| SUW Piaski (os. Piaski, Grudzie, Bukowiec C) | 240 | 240 | very hard |
| SUW Łajski (os. Młodych, III Parcela, Kozłówka) | 310 | 310 | very hard |
PWK Legionowo's second-quarter 2026 analysis gives a median of 240 mg/L CaCO₃, with three zones from 240 to 310 mg/L. The lowest value equals the median, so most of the network sits at the lower end and a few areas are harder. This is very hard water, and scale builds up in appliances. The report does not state the source.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 240 mg/L |
|---|---|
| Utility | PWK Legionowo Sp. z o.o. |
How Legionowo compares
- Tap water in Legionowo is close to the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 50 of 91 in Poland (1 = hardest); 44 % of these cities have softer water.
- In mazowieckie it is number 12 of 17 cities; the regional median is 251 mg/L.
- Nearest city with clearly softer water: Tomaszów Mazowiecki, 115 km away (166 mg/L).
- Nearest city with clearly harder water: Ciechanów, 57 km away (338 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 Legionowo
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| 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 Legionowo water hard or soft?
It is very hard: 240 mg/L as CaCO₃ (14 gpg, 13.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Legionowo 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 Legionowo water?
14 gpg, equal to 13.4 °dH, 24 °fH or 240 mg/L calcium carbonate.
What dishwasher salt setting should I use in Legionowo?
For 240 mg/L (13.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Legionowo?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: PWK Legionowo – Wyniki analiz II kwartał 2026 (2026). Method: figure published by the water supplier. PWK Legionowo – Wyniki analiz II kwartał 2026 · Outdated figure? Tell us