Water hardness in Rybňany
1.34 mmol/L hard
Tap water in Rybňany is hard: 1.34 mmol/L (134 mg/L · 7.8 gpg · 7.5 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Rybňany is supplied through the network of Severočeské vodovody a kanalizace (SčVK), which draws on reservoirs and groundwater across northern Bohemia; the exact source for Rybňany is not confirmed here. Hardness is reported at 134.1 mg/L CaCO₃, so the water is hard. Visible limescale on kettles and shower screens is likely, so regular descaling helps.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.34 mmol/L |
|---|---|
| Calcium (mg/L) | 37 |
| Magnesium (mg/L) | 9.7 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Rybňany compares
- Tap water in Rybňany is 12 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 543 of 1516 in Czechia (1 = hardest); 64 % of these cities have softer water.
- In Ústecký kraj it is number 311 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Tvršice, 1 km away (0.79 mmol/L).
- Nearest city with clearly harder water: Dobříčany, 3 km away (4.77 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Rybňany
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H2 |
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 Rybňany water hard or soft?
It is hard: 134 mg/L as CaCO₃ (7.8 gpg, 7.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rybňany 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 Rybňany water?
7.8 gpg, equal to 7.5 °dH, 13.4 °fH or 134 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rybňany?
For 134 mg/L (7.5 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Rybňany?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
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