Water hardness in Černíč
2 mmol/L very hard
Tap water in Černíč is very hard: 2 mmol/L (200 mg/L · 11.7 gpg · 11.2 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2025) · data checked 2026-10-21
ČEVAK a.s. reports 200.2 mg/L CaCO₃ for Černíč in the Plzeňský kraj, which is very hard. The figure is dated 2025, one year older than most entries in this batch. The source page does not name the water source, so the cause is not confirmed. Plan for regular descaling and consider a softener.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 2 mmol/L |
|---|---|
| Calcium (mg/L) | 47 |
| Magnesium (mg/L) | 20 |
| Utility | ČEVAK a.s. |
How Černíč compares
- Tap water in Černíč is 67 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 364 of 1516 in Czechia (1 = hardest); 76 % of these cities have softer water.
- In Plzeňský kraj it is number 16 of 75 cities; the regional median is 1.64 mmol/L.
- Nearest city with clearly softer water: Veřechov, 9 km away (1.11 mmol/L).
- Nearest city with clearly harder water: Malý Bor, 5 km away (2.74 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 Černíč
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °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 Černíč water hard or soft?
It is very hard: 200 mg/L as CaCO₃ (11.7 gpg, 11.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Černíč 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 Černíč water?
11.7 gpg, equal to 11.2 °dH, 20 °fH or 200 mg/L calcium carbonate.
What dishwasher salt setting should I use in Černíč?
For 200 mg/L (11.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Černíč?
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