Water hardness in Předmíř
1.91 mmol/L very hard
Tap water in Předmíř is very hard: 1.91 mmol/L (191 mg/L · 11.2 gpg · 10.7 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025) · data checked 2026-10-21
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.91 mmol/L |
|---|---|
| Calcium (mg/L) | 47 |
| Magnesium (mg/L) | 18 |
| Utility | ČEVAK a.s. |
How Předmíř compares
- Tap water in Předmíř is 59 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 380 of 1516 in Czechia (1 = hardest); 75 % of these cities have softer water.
- In Jihočeský kraj it is number 26 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Lnáře, 4 km away (1.45 mmol/L).
- Nearest city with clearly harder water: Plíškovice, 18 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 Předmíř
| 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 Předmíř water hard or soft?
It is very hard: 191 mg/L as CaCO₃ (11.2 gpg, 10.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Předmíř 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 Předmíř water?
11.2 gpg, equal to 10.7 °dH, 19.1 °fH or 191 mg/L calcium carbonate.
What dishwasher salt setting should I use in Předmíř?
For 191 mg/L (10.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Předmíř?
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