Water hardness in Zvolen
1.5 mmol/L hard
Tap water in Zvolen is hard: 1.5 mmol/L (150 mg/L · 8.8 gpg · 8.4 °dH).
Source: Stredoslovenská vodárenská prevádzková spoločnosť (StVPS) (2026) · data checked 2026-10-20
Range across supply zones: 28–210 mg/L.
StVPS supplies this town; its sources in central Slovakia include reservoirs such as Turček and local groundwater or springs, so the exact source for a given street can differ. The reported hardness is 150.1 mg/L CaCO₃, with measurements from 28.1 to 210.2 mg/L. Limescale is visible on kettles, taps and heaters, and a scale-reduction filter or softener can help protect appliances.
Slovak suppliers report "Vápnik a horčík" in mmol/L; the recommended range is 1.1–5 mmol/L.
Water data
| Total hardness | 1.5 mmol/L |
|---|---|
| Utility | Stredoslovenská vodárenská prevádzková spoločnosť (StVPS) |
How Zvolen compares
- Tap water in Zvolen is 21 % softer than the median of the 1113 cities we track in Slovakia (1.9 mmol/L).
- By hardness it ranks 620 of 1113 in Slovakia (1 = hardest); 44 % of these cities have softer water.
- In Banská Bystrica Region it is number 120 of 327 cities; the regional median is 1 mmol/L.
- Nearest city with clearly softer water: Zvolenská Slatina, 8 km away (0.6 mmol/L).
- Nearest city with clearly harder water: Kováčová, 5 km away (2 mmol/L).
Ranking of the hardest and softest water in Slovakia →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Zvolen
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
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 Zvolen water hard or soft?
It is hard: 150 mg/L as CaCO₃ (8.8 gpg, 8.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Zvolen 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 Zvolen water?
8.8 gpg, equal to 8.4 °dH, 15 °fH or 150 mg/L calcium carbonate.
What dishwasher salt setting should I use in Zvolen?
For 150 mg/L (8.4 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Zvolen?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Stredoslovenská vodárenská prevádzková spoločnosť (StVPS) (2026). Method: figure published by the water supplier. Stredoslovenská vodárenská prevádzková spoločnosť (StVPS) · Outdated figure? Tell us