Water hardness in Radvánov
2.15 mmol/L very hard
Tap water in Radvánov is very hard: 2.15 mmol/L (215 mg/L · 12.6 gpg · 12.1 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025) · data checked 2026-10-21
ČEVAK reports 215.2 mg/L for Radvánov in the Písek district, classed as very hard. The figure is dated 2025, so it is a little older than most entries here. Expect visible scale on kettles and shower screens, and consider descaling appliances regularly.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 2.15 mmol/L |
|---|---|
| Calcium (mg/L) | 50 |
| Magnesium (mg/L) | 22 |
| Utility | ČEVAK a.s. |
How Radvánov compares
- Tap water in Radvánov is 79 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 337 of 1516 in Czechia (1 = hardest); 78 % of these cities have softer water.
- In Jihočeský kraj it is number 15 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Níkovice, 6 km away (1.2 mmol/L).
- Nearest city with clearly harder water: Horosedly, 15 km away (3.08 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 Radvánov
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 12 °dH |
| AEG / Electrolux | 3 |
| 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 Radvánov water hard or soft?
It is very hard: 215 mg/L as CaCO₃ (12.6 gpg, 12.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Radvánov 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 Radvánov water?
12.6 gpg, equal to 12.1 °dH, 21.5 °fH or 215 mg/L calcium carbonate.
What dishwasher salt setting should I use in Radvánov?
For 215 mg/L (12.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Radvánov?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025). Method: figure published by the water supplier. ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody · Outdated figure? Tell us