Water hardness in Klášterec nad Ohří
0.81 mmol/L moderately hard
Tap water in Klášterec nad Ohří is moderately hard: 0.81 mmol/L (81 mg/L · 4.7 gpg · 4.5 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Range across supply zones: 76–86 mg/L.
Klášterec nad Ohří is supplied by SčVK, and Ore Mountains reservoirs are key sources for the wider region; the exact source for the town is not confirmed here. Reported hardness is 81.1 mg/L CaCO₃ within a range of 76.1 to 86.1 mg/L. Limescale buildup is slow and a softener is rarely needed.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 0.81 mmol/L |
|---|---|
| Calcium (mg/L) | 26 |
| Magnesium (mg/L) | 3.55 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Klášterec nad Ohří compares
- Tap water in Klášterec nad Ohří is 32 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 1053 of 1516 in Czechia (1 = hardest); 29 % of these cities have softer water.
- In Ústecký kraj it is number 382 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Výsluní, 9 km away (0.31 mmol/L).
- Nearest city with clearly harder water: Kotvina, 3 km away (1.54 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 Klášterec nad Ohří
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °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 Klášterec nad Ohří water hard or soft?
It is moderately hard: 81 mg/L as CaCO₃ (4.7 gpg, 4.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Klášterec nad Ohří 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 Klášterec nad Ohří water?
4.7 gpg, equal to 4.5 °dH, 8.1 °fH or 81 mg/L calcium carbonate.
What dishwasher salt setting should I use in Klášterec nad Ohří?
For 81 mg/L (4.5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Klášterec nad Ohří?
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