Water hardness in Grudziądz
359 mg/L very hard
Tap water in Grudziądz is very hard: 359 mg/L (21 gpg · 20.1 °dH · 35.9 °fH).
Source: MWiO Grudziądz, Laboratorium Centralne, jakość wody wrzesień 2026 (2026-09) · data checked 2026-10-29
MWiO Grudziądz's laboratory report for September 2026 gives 359 mg/L CaCO₃, one of the harder results among larger Polish cities in this data. It is a single figure for the city, so we show no range. At this level scale builds up fast in boilers and kettles, and a softener is a reasonable option for households with a hot-water tank.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 359 mg/L |
|---|---|
| Utility | Miejskie Wodociągi i Oczyszczalnia Sp. z o.o. |
How Grudziądz compares
- Tap water in Grudziądz is 47 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 8 of 91 in Poland (1 = hardest); 92 % of these cities have softer water.
- In kujawsko-pomorskie it is number 2 of 4 cities; the regional median is 314 mg/L.
- Nearest city with clearly softer water: Bydgoszcz, 64 km away (234 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 Grudziądz
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| 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 Grudziądz water hard or soft?
It is very hard: 359 mg/L as CaCO₃ (21 gpg, 20.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Grudziądz 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 Grudziądz water?
21 gpg, equal to 20.1 °dH, 35.9 °fH or 359 mg/L calcium carbonate.
What dishwasher salt setting should I use in Grudziądz?
For 359 mg/L (20.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Grudziądz?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: MWiO Grudziądz, Laboratorium Centralne, jakość wody wrzesień 2026 (2026-09). Method: figure published by the water supplier. MWiO Grudziądz, Laboratorium Centralne, jakość wody wrzesień 2026 · Outdated figure? Tell us