Water hardness in Háj u Duchcova
0.25 mmol/L soft
Tap water in Háj u Duchcova is soft: 0.25 mmol/L (25 mg/L · 1.5 gpg · 1.4 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 0.25 mmol/L |
|---|---|
| Calcium (mg/L) | 6 |
| Magnesium (mg/L) | 2.43 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Háj u Duchcova compares
- Tap water in Háj u Duchcova is 79 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 1504 of 1516 in Czechia (1 = hardest); 0 % of these cities have softer water.
- In Ústecký kraj it is number 627 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly harder water: Osek, 2 km away (0.65 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Háj u Duchcova
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Háj u Duchcova water hard or soft?
It is soft: 25 mg/L as CaCO₃ (1.5 gpg, 1.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Háj u Duchcova 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 Háj u Duchcova water?
1.5 gpg, equal to 1.4 °dH, 2.5 °fH or 25 mg/L calcium carbonate.
What dishwasher salt setting should I use in Háj u Duchcova?
For 25 mg/L (1.4 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Háj u Duchcova?
No. With soft water a softener adds nothing.
Source
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026). Method: figure published by the water supplier. SčVK, Moje obec – kvalita vody (aktuální hodnoty) · Outdated figure? Tell us