Water hardness in Trojany
1.13 mmol/L moderately hard
Tap water in Trojany is moderately hard: 1.13 mmol/L (113 mg/L · 6.6 gpg · 6.3 °dH).
Source: ČEVAK a.s. (Veolia), Moje obec – kvalita pitné vody (2026) · data checked 2026-10-21
Trojany is supplied by ČEVAK, with a reported hardness of 113.1 mg/L, a moderate level. The utility gives the same value for Rybník, which may point to a shared supply, though this is not stated. Scale forms slowly at this level.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.13 mmol/L |
|---|---|
| Calcium (mg/L) | 38 |
| Magnesium (mg/L) | 4.3 |
| Utility | ČEVAK a.s. |
How Trojany compares
- Tap water in Trojany is 6 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 822 of 1516 in Czechia (1 = hardest); 45 % of these cities have softer water.
- In Jihočeský kraj it is number 284 of 505 cities; the regional median is 1.2 mmol/L.
- Nearest city with clearly softer water: Bujanov, 4 km away (0.75 mmol/L).
- Nearest city with clearly harder water: Lužná, 15 km away (1.58 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 Trojany
| 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 Trojany water hard or soft?
It is moderately hard: 113 mg/L as CaCO₃ (6.6 gpg, 6.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Trojany 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 Trojany water?
6.6 gpg, equal to 6.3 °dH, 11.3 °fH or 113 mg/L calcium carbonate.
What dishwasher salt setting should I use in Trojany?
For 113 mg/L (6.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Trojany?
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