Water hardness in Radouň
3.32 mmol/L very hard
Tap water in Radouň is very hard: 3.32 mmol/L (332 mg/L · 19.4 gpg · 18.6 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
SčVK reports 332.3 mg/L hardness as CaCO₃ for Radouň in the Litoměřice area, well into the very hard band. The wider area has limestone and marl in places, which can raise hardness, but the utility page does not name the source for this village. Plan for fast scale build-up in water heaters, and consider a softener or a scale-protection cartridge.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 3.32 mmol/L |
|---|---|
| Calcium (mg/L) | 114 |
| Magnesium (mg/L) | 11.5 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Radouň compares
- Tap water in Radouň is 177 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 192 of 1516 in Czechia (1 = hardest); 87 % of these cities have softer water.
- In Ústecký kraj it is number 179 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Tuhaň, 8 km away (1.63 mmol/L).
- Nearest city with clearly harder water: Křešov, 1 km away (4.44 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 Radouň
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| 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 Radouň water hard or soft?
It is very hard: 332 mg/L as CaCO₃ (19.4 gpg, 18.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Radouň 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 Radouň water?
19.4 gpg, equal to 18.6 °dH, 33.2 °fH or 332 mg/L calcium carbonate.
What dishwasher salt setting should I use in Radouň?
For 332 mg/L (18.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Radouň?
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