Water hardness in Kędzierzyn-Koźle
317 mg/L very hard
Tap water in Kędzierzyn-Koźle is very hard: 317 mg/L (18.5 gpg · 17.7 °dH · 31.6 °fH).
Source: MWiK Kędzierzyn-Koźle – woda podawana do sieci I półrocze 2026 (2026) · data checked 2026-10-29
Range across supply zones: 306–327 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| Ujęcie Dunikowskiego | 327 | 327 | very hard |
| Ujęcie Kędzierzyn | 306 | 306 | very hard |
MWiK Kędzierzyn-Koźle reports water supplied to the network in the first half of 2026 at a median of 316.5 mg/L CaCO₃ across two zones, with values from 306 to 327 mg/L. The two zones are close together, so hardness is consistently very hard across the town. Expect heavy scale in kettles and boilers.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 317 mg/L |
|---|---|
| Calcium (mg/L) | 102 |
| Magnesium (mg/L) | 13 |
| Utility | MWiK Kędzierzyn-Koźle |
How Kędzierzyn-Koźle compares
- Tap water in Kędzierzyn-Koźle is 29 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 13 of 91 in Poland (1 = hardest); 87 % of these cities have softer water.
- In opolskie it is number 1 of 3 cities; the regional median is 186 mg/L.
- Nearest city with clearly softer water: Rybnik, 36 km away (100 mg/L).
- Nearest city with clearly harder water: Oleśnica, 113 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 Kędzierzyn-Koźle
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °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 Kędzierzyn-Koźle water hard or soft?
It is very hard: 317 mg/L as CaCO₃ (18.5 gpg, 17.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Kędzierzyn-Koźle 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 Kędzierzyn-Koźle water?
18.5 gpg, equal to 17.7 °dH, 31.6 °fH or 317 mg/L calcium carbonate.
What dishwasher salt setting should I use in Kędzierzyn-Koźle?
For 317 mg/L (17.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Kędzierzyn-Koźle?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: MWiK Kędzierzyn-Koźle – woda podawana do sieci I półrocze 2026 (2026). Method: figure published by the water supplier. MWiK Kędzierzyn-Koźle – woda podawana do sieci I półrocze 2026 · Outdated figure? Tell us