Water hardness in Chojnice
309 mg/L very hard
Tap water in Chojnice is very hard: 309 mg/L (18 gpg · 17.3 °dH · 30.9 °fH).
Source: Miejskie Wodociągi Chojnice – Jakość wody (2026) · data checked 2026-10-29
Miejskie Wodociągi Chojnice reports a hardness of 309 mg/L CaCO₃ on its water quality page. Only one value is given, with no zone breakdown. The water is very hard, and heavy limescale in kettles, boilers and washing machines is the usual result. The page does not describe the source, so we do not state one.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 309 mg/L |
|---|---|
| Utility | Miejskie Wodociągi Chojnice |
How Chojnice compares
- Tap water in Chojnice is 26 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 14 of 91 in Poland (1 = hardest); 86 % of these cities have softer water.
- In pomorskie it is number 1 of 7 cities; the regional median is 220 mg/L.
- Nearest city with clearly softer water: Bydgoszcz, 70 km away (234 mg/L).
- Nearest city with clearly harder water: Fordon, 73 km away (404 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 Chojnice
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 17 °dH |
| AEG / Electrolux | 4 |
| 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 Chojnice water hard or soft?
It is very hard: 309 mg/L as CaCO₃ (18 gpg, 17.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Chojnice 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 Chojnice water?
18 gpg, equal to 17.3 °dH, 30.9 °fH or 309 mg/L calcium carbonate.
What dishwasher salt setting should I use in Chojnice?
For 309 mg/L (17.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Chojnice?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Miejskie Wodociągi Chojnice – Jakość wody (2026). Method: figure published by the water supplier. Miejskie Wodociągi Chojnice – Jakość wody · Outdated figure? Tell us