Water hardness in Rankov
1.15 mmol/L moderately hard
Tap water in Rankov is moderately hard: 1.15 mmol/L (115 mg/L · 6.7 gpg · 6.4 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025) · data checked 2026-10-21
Rankov, in the České Budějovice district, has a reported hardness of 115.1 mg/L from ČEVAK. The figure is dated 2025, one year older than most entries here. That is moderate hardness, close to the hard threshold. The source is not named on the page, and some limescale on kettles is likely.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.15 mmol/L |
|---|---|
| Calcium (mg/L) | 39 |
| Magnesium (mg/L) | 4.3 |
| Utility | ČEVAK a.s. |
How Rankov compares
- Tap water in Rankov is close to the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 811 of 1516 in Czechia (1 = hardest); 46 % of these cities have softer water.
- In Jihočeský kraj it is number 277 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Lniště, 4 km away (0.25 mmol/L).
- Nearest city with clearly harder water: Ohrazeníčko, 8 km away (2.17 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 Rankov
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °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 Rankov water hard or soft?
It is moderately hard: 115 mg/L as CaCO₃ (6.7 gpg, 6.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rankov 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 Rankov water?
6.7 gpg, equal to 6.4 °dH, 11.5 °fH or 115 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rankov?
For 115 mg/L (6.4 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Rankov?
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