Water hardness in Ostojkovice
0.95 mmol/L moderately hard
Tap water in Ostojkovice is moderately hard: 0.95 mmol/L (95 mg/L · 5.6 gpg · 5.3 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025) · data checked 2026-10-21
Ostojkovice in the Jihočeský kraj is served by ČEVAK, which reports 95.1 mg/L as CaCO₃, a moderate figure. The record is dated 2025, so it may be slightly older than the other entries. No source description is available to us for the village. Light scale is typical, 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 | 0.95 mmol/L |
|---|---|
| Calcium (mg/L) | 20 |
| Magnesium (mg/L) | 11 |
| Utility | ČEVAK a.s. |
How Ostojkovice compares
- Tap water in Ostojkovice is 21 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 889 of 1516 in Czechia (1 = hardest); 39 % of these cities have softer water.
- In Jihočeský kraj it is number 312 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Valtínov, 19 km away (0.5 mmol/L).
- Nearest city with clearly harder water: Písečné, 8 km away (1.78 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 Ostojkovice
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| 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 Ostojkovice water hard or soft?
It is moderately hard: 95 mg/L as CaCO₃ (5.6 gpg, 5.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ostojkovice 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 Ostojkovice water?
5.6 gpg, equal to 5.3 °dH, 9.5 °fH or 95 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ostojkovice?
For 95 mg/L (5.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Ostojkovice?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025). Method: figure published by the water supplier. ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody · Outdated figure? Tell us