Water hardness in Oleśnica
445 mg/L very hard
Tap water in Oleśnica is very hard: 445 mg/L (26 gpg · 24.9 °dH · 44.5 °fH).
Source: MGK Oleśnica – Twardość wody wodociągowej (2020) · data checked 2026-10-29
Range across supply zones: 190–491 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 ul. Brzozowa (~20%) | 491 | 491 | very hard |
| SUW ul. Ciepła (~15%) | 445 | 445 | very hard |
| SUW ul. Dobroszycka (~65% of city) | 190 | 190 | very hard |
This figure is over 3 years old; hardness may have changed.
MGK Oleśnica lists three supply zones with a wide spread, from 190 to 491 mg/L CaCO₃, and a median of 445 mg/L. That makes the value very hard in most of the network, with a clear gap between zones. The source document dates from 2020, so check the current table for your street.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 445 mg/L |
|---|---|
| Utility | MGK Oleśnica |
How Oleśnica compares
- Tap water in Oleśnica is 82 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 2 of 91 in Poland (1 = hardest); 99 % of these cities have softer water.
- In dolnośląskie it is number 2 of 7 cities; the regional median is 245 mg/L.
- Nearest city with clearly softer water: Wrocław, 28 km away (207 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 Oleśnica
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 25 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Oleśnica water hard or soft?
It is very hard: 445 mg/L as CaCO₃ (26 gpg, 24.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Oleśnica 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 Oleśnica water?
26 gpg, equal to 24.9 °dH, 44.5 °fH or 445 mg/L calcium carbonate.
What dishwasher salt setting should I use in Oleśnica?
For 445 mg/L (24.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Oleśnica?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: MGK Oleśnica – Twardość wody wodociągowej (2020). Method: figure published by the water supplier. MGK Oleśnica – Twardość wody wodociągowej · Outdated figure? Tell us