Water hardness in Rzeszów
263 mg/L very hard
Tap water in Rzeszów is very hard: 263 mg/L (15.4 gpg · 14.7 °dH · 26.3 °fH).
Source: MPWiK Rzeszów (2026-09) · data checked 2026-10-21
MPWiK Rzeszów publishes a monthly report with one network-wide value. The September 2026 report gives total hardness of 263 mg/L CaCO₃, against a national limit of 60 to 500. There is no zone breakdown, so the figure may differ between neighbourhoods. The water is very hard, and a descaling routine for kettles and boilers is the usual consequence.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 263 mg/L |
|---|---|
| Utility | Miejskie Przedsiębiorstwo Wodociągów i Kanalizacji w Rzeszowie (MPWiK Rzeszów) |
How Rzeszów compares
- Tap water in Rzeszów is 7 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 34 of 91 in Poland (1 = hardest); 62 % of these cities have softer water.
- In podkarpackie it is number 1 of 8 cities; the regional median is 186 mg/L.
- Nearest city with clearly softer water: Dębica, 42 km away (190 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 Rzeszów
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| Hoover | S2 |
| 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 Rzeszów water hard or soft?
It is very hard: 263 mg/L as CaCO₃ (15.4 gpg, 14.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rzeszów 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 Rzeszów water?
15.4 gpg, equal to 14.7 °dH, 26.3 °fH or 263 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rzeszów?
For 263 mg/L (14.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Rzeszów?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: MPWiK Rzeszów (2026-09). Method: figure published by the water supplier. MPWiK Rzeszów · Outdated figure? Tell us