Water hardness in Sádek
3.66 mmol/L very hard
Tap water in Sádek is very hard: 3.66 mmol/L (367 mg/L · 21.4 gpg · 20.5 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Range across supply zones: 354–379 mg/L.
SčVK publishes a median of 366.8 mg/L as CaCO₃ for Sádek, near Louny in the Ústecký kraj, with a range of 354.3 to 379.3 mg/L. This is very hard water, and one of the hardest in this batch. The range is fairly tight, so the level is steady. Expect heavy scale in boilers, 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 | 3.66 mmol/L |
|---|---|
| Calcium (mg/L) | 92 |
| Magnesium (mg/L) | 33.3 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Sádek compares
- Tap water in Sádek is 205 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 156 of 1516 in Czechia (1 = hardest); 90 % of these cities have softer water.
- In Ústecký kraj it is number 147 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Malá Černoc, 5 km away (1.39 mmol/L).
- Nearest city with clearly harder water: Holedeč, 4 km away (4.98 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 Sádek
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 21 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H3 |
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 Sádek water hard or soft?
It is very hard: 367 mg/L as CaCO₃ (21.4 gpg, 20.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sádek 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 Sádek water?
21.4 gpg, equal to 20.5 °dH, 36.7 °fH or 367 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sádek?
For 367 mg/L (20.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Sádek?
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