Water hardness in Křenov
1.88 mmol/L very hard
Tap water in Křenov is very hard: 1.88 mmol/L (188 mg/L · 11 gpg · 10.5 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
SčVK publishes 188.2 mg/L hardness as CaCO₃ for Křenov in the Liberec region, classed as very hard. The utility page does not state the supply source, so any link to local geology is unconfirmed. Expect limescale on taps and heating elements, and rinse-aid and salt settings in the dishwasher should be set for hard water.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.88 mmol/L |
|---|---|
| Calcium (mg/L) | 63 |
| Magnesium (mg/L) | 7.14 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Křenov compares
- Tap water in Křenov is 57 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 389 of 1516 in Czechia (1 = hardest); 74 % of these cities have softer water.
- In Liberecký kraj it is number 91 of 273 cities; the regional median is 1.26 mmol/L.
- Nearest city with clearly softer water: Korce, 3 km away (1.48 mmol/L).
- Nearest city with clearly harder water: Dražejov, 2 km away (2.71 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 Křenov
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °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 Křenov water hard or soft?
It is very hard: 188 mg/L as CaCO₃ (11 gpg, 10.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Křenov 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 Křenov water?
11 gpg, equal to 10.5 °dH, 18.8 °fH or 188 mg/L calcium carbonate.
What dishwasher salt setting should I use in Křenov?
For 188 mg/L (10.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Křenov?
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