Water hardness in Ostrov (Košice Region)
0.66 mmol/L moderately hard
Tap water in Ostrov (Košice Region) is moderately hard: 0.66 mmol/L (66 mg/L · 3.9 gpg · 3.7 °dH).
Source: Východoslovenská vodárenská spoločnosť (VVS) (2025) · data checked 2026-10-20
Slovak suppliers report "Vápnik a horčík" in mmol/L; the recommended range is 1.1–5 mmol/L.
Water data
| Total hardness | 0.66 mmol/L |
|---|---|
| Utility | Východoslovenská vodárenská spoločnosť (VVS) |
How Ostrov (Košice Region) compares
- Tap water in Ostrov (Košice Region) is 65 % softer than the median of the 1113 cities we track in Slovakia (1.9 mmol/L).
- By hardness it ranks 1044 of 1113 in Slovakia (1 = hardest); 6 % of these cities have softer water.
- In Košice Region it is number 283 of 300 cities; the regional median is 1.28 mmol/L.
- Nearest city with clearly softer water: Baškovce, 8 km away (0.52 mmol/L).
- Nearest city with clearly harder water: Bunkovce, 3 km away (0.92 mmol/L).
Ranking of the hardest and softest water in Slovakia →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Ostrov
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Ostrov (Košice Region) water hard or soft?
It is moderately hard: 66 mg/L as CaCO₃ (3.9 gpg, 3.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ostrov (Košice Region) safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Slovak suppliers report "Vápnik a horčík" in mmol/L; the recommended range is 1.1–5 mmol/L.
How many grains per gallon is Ostrov (Košice Region) water?
3.9 gpg, equal to 3.7 °dH, 6.6 °fH or 66 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ostrov (Košice Region)?
For 66 mg/L (3.7 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Ostrov (Košice Region)?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: Východoslovenská vodárenská spoločnosť (VVS) (2025). Method: figure published by the water supplier. Východoslovenská vodárenská spoločnosť (VVS) · Outdated figure? Tell us