Water hardness in Tczew
230 mg/L very hard
Tap water in Tczew is very hard: 230 mg/L (13.4 gpg · 12.9 °dH · 23 °fH).
Source: PSSE Tczew – Twardość wody dla poszczególnych miejscowości powiatu tczewskiego (2025) · data checked 2026-10-29
Range across supply zones: 212–248 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| SUW Motława | 212 | 212 | very hard |
| SUW Tczew Park | 248 | 248 | very hard |
The sanitary inspectorate (PSSE) in Tczew lists hardness by locality for the county, and the figures for Tczew give a median of 230 mg/L CaCO₃. The two zones span 212 to 248 mg/L. This is very hard water, so scale in boilers and on shower screens is common. The source document is a regional table, and it does not explain the geology behind the values.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 230 mg/L |
|---|---|
| Utility | ZWiK Sp. z o.o. Tczew |
How Tczew compares
- Tap water in Tczew is 6 % softer than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 54 of 91 in Poland (1 = hardest); 40 % of these cities have softer water.
- In pomorskie it is number 3 of 7 cities; the regional median is 220 mg/L.
- Nearest city with clearly softer water: Wejherowo, 67 km away (174 mg/L).
- Nearest city with clearly harder water: Grudziądz, 68 km away (359 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 Tczew
| 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 Tczew water hard or soft?
It is very hard: 230 mg/L as CaCO₃ (13.4 gpg, 12.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Tczew 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 Tczew water?
13.4 gpg, equal to 12.9 °dH, 23 °fH or 230 mg/L calcium carbonate.
What dishwasher salt setting should I use in Tczew?
For 230 mg/L (12.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Tczew?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: PSSE Tczew – Twardość wody dla poszczególnych miejscowości powiatu tczewskiego (2025). Method: figure published by the water supplier. PSSE Tczew – Twardość wody dla poszczególnych miejscowości powiatu tczewskiego · Outdated figure? Tell us