Water hardness in Rybník
1.13 mmol/L moderately hard
Tap water in Rybník is moderately hard: 1.13 mmol/L (113 mg/L · 6.6 gpg · 6.3 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
Rybník gets its water from ČEVAK, which reports 113.1 mg/L for the village, a moderate level. The figure is the utility's published value for 2026. The same utility reports both softer and harder values in nearby South Bohemian villages, so check the local page rather than assuming a regional average.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.13 mmol/L |
|---|---|
| Calcium (mg/L) | 38 |
| Magnesium (mg/L) | 4.3 |
| Utility | ČEVAK a.s. |
How Rybník compares
- Tap water in Rybník is 6 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 822 of 1516 in Czechia (1 = hardest); 45 % of these cities have softer water.
- In Jihočeský kraj it is number 284 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Český Heršlák, 5 km away (0.6 mmol/L).
- Nearest city with clearly harder water: Lužná, 16 km away (1.58 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 Rybník
| 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 Rybník water hard or soft?
It is moderately hard: 113 mg/L as CaCO₃ (6.6 gpg, 6.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rybník 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 Rybník water?
6.6 gpg, equal to 6.3 °dH, 11.3 °fH or 113 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rybník?
For 113 mg/L (6.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Rybník?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026). Method: figure published by the water supplier. ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody · Outdated figure? Tell us