Water hardness in Dolní Chrášťany
2.33 mmol/L very hard
Tap water in Dolní Chrášťany is very hard: 2.33 mmol/L (233 mg/L · 13.6 gpg · 13.1 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
Dolní Chrášťany in Jihočeský kraj is supplied by ČEVAK, which reports 233.2 mg/L. That is very hard water. The utility page gives the figure but not the source, so we do not state where the water comes from. Expect heavy scale in kettles and water heaters, and consider a softener for the whole house.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 2.33 mmol/L |
|---|---|
| Calcium (mg/L) | 49 |
| Magnesium (mg/L) | 27 |
| Utility | ČEVAK a.s. |
How Dolní Chrášťany compares
- Tap water in Dolní Chrášťany is 94 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 301 of 1516 in Czechia (1 = hardest); 80 % of these cities have softer water.
- In Jihočeský kraj it is number 8 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Horní Chrášťany, 1 km away (0.55 mmol/L).
- Nearest city with clearly harder water: Muckov, 31 km away (3.01 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 Dolní Chrášťany
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| 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 Dolní Chrášťany water hard or soft?
It is very hard: 233 mg/L as CaCO₃ (13.6 gpg, 13.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Dolní Chrášťany 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 Dolní Chrášťany water?
13.6 gpg, equal to 13.1 °dH, 23.3 °fH or 233 mg/L calcium carbonate.
What dishwasher salt setting should I use in Dolní Chrášťany?
For 233 mg/L (13.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Dolní Chrášťany?
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 (2026). Method: figure published by the water supplier. ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody · Outdated figure? Tell us