Water hardness in Oldřiš
1.01 mmol/L moderately hard
Tap water in Oldřiš is moderately hard: 1.01 mmol/L (101 mg/L · 5.9 gpg · 5.7 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
Oldřiš, in the Jindřichův Hradec district, is listed by ČEVAK at 101.1 mg/L as CaCO₃, which is moderate and slightly above nearby villages in the same dataset. The utility page does not say where the water comes from. Light limescale in kettles is likely, and regular descaling is normally enough.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.01 mmol/L |
|---|---|
| Calcium (mg/L) | 34 |
| Magnesium (mg/L) | 4 |
| Utility | ČEVAK a.s. |
How Oldřiš compares
- Tap water in Oldřiš is 16 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 862 of 1516 in Czechia (1 = hardest); 43 % of these cities have softer water.
- In Jihočeský kraj it is number 307 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Blažejov, 2 km away (0.64 mmol/L).
- Nearest city with clearly harder water: Jarošov nad Nežárkou, 4 km away (1.62 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Oldřiš
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Oldřiš water hard or soft?
It is moderately hard: 101 mg/L as CaCO₃ (5.9 gpg, 5.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Oldřiš 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 Oldřiš water?
5.9 gpg, equal to 5.7 °dH, 10.1 °fH or 101 mg/L calcium carbonate.
What dishwasher salt setting should I use in Oldřiš?
For 101 mg/L (5.7 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Oldřiš?
Not essential; a scale inhibitor protects the heater cheaply.
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