Water hardness in Hrad Osek
0.77 mmol/L moderately hard
Tap water in Hrad Osek is moderately hard: 0.77 mmol/L (77 mg/L · 4.5 gpg · 4.3 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Range across supply zones: 74–80 mg/L.
SčVK reports a median of 77.1 mg/L CaCO₃ for Hrad Osek in Ústí Region, with a range of 74.1 to 80.1 mg/L. This is moderate hardness, at the lower end of the band. The utility does not name the source on its page. Scale is modest, and most households manage with ordinary descaling.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 0.77 mmol/L |
|---|---|
| Calcium (mg/L) | 27 |
| Magnesium (mg/L) | 2.08 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Hrad Osek compares
- Tap water in Hrad Osek is 36 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 1173 of 1516 in Czechia (1 = hardest); 21 % of these cities have softer water.
- In Ústecký kraj it is number 475 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Háj u Duchcova, 3 km away (0.25 mmol/L).
- Nearest city with clearly harder water: Kučlín, 14 km away (1.27 mmol/L).
Ranking of the hardest and softest water in Czechia →
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 Hrad Osek
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 2 |
| Beko | 1st |
| Hoover | S1 |
| LG | H1 |
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 Hrad Osek water hard or soft?
It is moderately hard: 77 mg/L as CaCO₃ (4.5 gpg, 4.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Hrad Osek safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
How many grains per gallon is Hrad Osek water?
4.5 gpg, equal to 4.3 °dH, 7.7 °fH or 77 mg/L calcium carbonate.
What dishwasher salt setting should I use in Hrad Osek?
For 77 mg/L (4.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Hrad Osek?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026). Method: figure published by the water supplier. SčVK, Moje obec – kvalita vody (aktuální hodnoty) · Outdated figure? Tell us