Water hardness in Slupečná
0.63 mmol/L moderately hard
Tap water in Slupečná is moderately hard: 0.63 mmol/L (63 mg/L · 3.7 gpg · 3.5 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025) · data checked 2026-10-21
ČEVAK reports 63.1 mg/L as CaCO₃ for Slupečná in Jihočeský kraj, a moderate value from 2025. The page does not describe the water source for this village, and the figure is a year older than most in this batch. Scale is mild, so a kettle needs descaling only now and then.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 0.63 mmol/L |
|---|---|
| Calcium (mg/L) | 16 |
| Magnesium (mg/L) | 5.5 |
| Utility | ČEVAK a.s. |
How Slupečná compares
- Tap water in Slupečná is 47 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 1341 of 1516 in Czechia (1 = hardest); 11 % of these cities have softer water.
- In Jihočeský kraj it is number 453 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Frymburk, 4 km away (0.42 mmol/L).
- Nearest city with clearly harder water: Kovářov, 8 km away (1.25 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 Slupečná
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Slupečná water hard or soft?
It is moderately hard: 63 mg/L as CaCO₃ (3.7 gpg, 3.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Slupečná 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 Slupečná water?
3.7 gpg, equal to 3.5 °dH, 6.3 °fH or 63 mg/L calcium carbonate.
What dishwasher salt setting should I use in Slupečná?
For 63 mg/L (3.5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Slupečná?
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