Water hardness in Chrastná
1.81 mmol/L very hard
Tap water in Chrastná is very hard: 1.81 mmol/L (181 mg/L · 10.6 gpg · 10.2 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
SčVK reports 181.2 mg/L hardness as CaCO₃ for Chrastná in the Liberec region. The source record uses the same municipality identifier as Lázně Kundratice, so the figure may cover a shared supply area. Limescale will be noticeable in kettles and washing machines.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.81 mmol/L |
|---|---|
| Calcium (mg/L) | 65 |
| Magnesium (mg/L) | 4.49 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Chrastná compares
- Tap water in Chrastná is 51 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 403 of 1516 in Czechia (1 = hardest); 73 % of these cities have softer water.
- In Liberecký kraj it is number 97 of 273 cities; the regional median is 1.26 mmol/L.
- Nearest city with clearly softer water: Lázně Kundratice, 2 km away (1.33 mmol/L).
- Nearest city with clearly harder water: Křižany, 4 km away (2.27 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Chrastná
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Chrastná water hard or soft?
It is very hard: 181 mg/L as CaCO₃ (10.6 gpg, 10.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Chrastná 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 Chrastná water?
10.6 gpg, equal to 10.2 °dH, 18.1 °fH or 181 mg/L calcium carbonate.
What dishwasher salt setting should I use in Chrastná?
For 181 mg/L (10.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Chrastná?
Yes, unless you are only passing through: scale damages appliances within a few years.
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