Water hardness in Opatovice
1.21 mmol/L hard
Tap water in Opatovice is hard: 1.21 mmol/L (121 mg/L · 7.1 gpg · 6.8 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
ČEVAK a.s. reports 121.1 mg/L as CaCO₃ for Opatovice in the Jihočeský kraj, which falls in the hard band. The utility publishes this figure per locality, and we have not verified which treatment plant or well field feeds this particular village. At this level, expect limescale on kettles and shower heads over time.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.21 mmol/L |
|---|---|
| Calcium (mg/L) | 32 |
| Magnesium (mg/L) | 10 |
| Utility | ČEVAK a.s. |
How Opatovice compares
- Tap water in Opatovice is close to the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 595 of 1516 in Czechia (1 = hardest); 60 % of these cities have softer water.
- In Jihočeský kraj it is number 73 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Staré Hodějovice, 11 km away (0.95 mmol/L).
- Nearest city with clearly harder water: Ohrazení, 14 km away (2.17 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Opatovice
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| 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 Opatovice water hard or soft?
It is hard: 121 mg/L as CaCO₃ (7.1 gpg, 6.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Opatovice 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 Opatovice water?
7.1 gpg, equal to 6.8 °dH, 12.1 °fH or 121 mg/L calcium carbonate.
What dishwasher salt setting should I use in Opatovice?
For 121 mg/L (6.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Opatovice?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026). Method: figure published by the water supplier. ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody · Outdated figure? Tell us