Water hardness in Lužná
1.58 mmol/L hard
Tap water in Lužná is hard: 1.58 mmol/L (158 mg/L · 9.2 gpg · 8.9 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
ČEVAK a.s. reports 158.1 mg/L CaCO₃ for Lužná in the Český Krumlov district, which is hard. We have not confirmed the water source for this village. Expect visible limescale on kettles and shower screens over time. Regular descaling is usually enough at this level.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.58 mmol/L |
|---|---|
| Calcium (mg/L) | 45 |
| Magnesium (mg/L) | 11 |
| Utility | ČEVAK a.s. |
How Lužná compares
- Tap water in Lužná is 32 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 458 of 1516 in Czechia (1 = hardest); 70 % of these cities have softer water.
- In Jihočeský kraj it is number 41 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Chabičovice, 8 km away (1.2 mmol/L).
- Nearest city with clearly harder water: Muckov, 11 km away (3.01 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 Lužná
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| 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 Lužná water hard or soft?
It is hard: 158 mg/L as CaCO₃ (9.2 gpg, 8.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Lužná 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 Lužná water?
9.2 gpg, equal to 8.9 °dH, 15.8 °fH or 158 mg/L calcium carbonate.
What dishwasher salt setting should I use in Lužná?
For 158 mg/L (8.9 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Lužná?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
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