Water hardness in Straškov
4.77 mmol/L very hard
Tap water in Straškov is very hard: 4.77 mmol/L (477 mg/L · 27.9 gpg · 26.7 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
SčVK reports 477.4 mg/L as CaCO₃ for Straškov in Ústecký kraj (2026), among the hardest values in this batch and in the very hard band. The utility page does not name the source, so the cause is not stated here. Scale will form quickly on heaters and in pipes, and a softener is worth considering.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 4.77 mmol/L |
|---|---|
| Calcium (mg/L) | 163 |
| Magnesium (mg/L) | 17.1 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Straškov compares
- Tap water in Straškov is 298 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 56 of 1516 in Czechia (1 = hardest); 96 % of these cities have softer water.
- In Ústecký kraj it is number 56 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Kostomlaty pod Řípem, 6 km away (3.45 mmol/L).
- Nearest city with clearly harder water: Vrbičany, 16 km away (6.21 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 Straškov
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 27 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S4 |
| LG | H4 |
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 Straškov water hard or soft?
It is very hard: 477 mg/L as CaCO₃ (27.9 gpg, 26.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Straškov 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 Straškov water?
27.9 gpg, equal to 26.7 °dH, 47.7 °fH or 477 mg/L calcium carbonate.
What dishwasher salt setting should I use in Straškov?
For 477 mg/L (26.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Straškov?
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