Water hardness in Modrá
0.49 mmol/L soft
Tap water in Modrá is soft: 0.49 mmol/L (49 mg/L · 2.9 gpg · 2.7 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Modrá, near Děčín in the Ústecký kraj, is served by SčVK at 49.0 mg/L as CaCO₃. This is soft water, with no range published. We have not verified the source for this village. Little scale forms, so detergent can be dosed at the lower end.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 0.49 mmol/L |
|---|---|
| Calcium (mg/L) | 15 |
| Magnesium (mg/L) | 2.75 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Modrá compares
- Tap water in Modrá is 59 % softer than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 1401 of 1516 in Czechia (1 = hardest); 7 % of these cities have softer water.
- In Ústecký kraj it is number 583 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Malšovice, 5 km away (0.37 mmol/L).
- Nearest city with clearly harder water: Jílové, 0 km away (1.72 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 Modrá
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °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 Modrá water hard or soft?
It is soft: 49 mg/L as CaCO₃ (2.9 gpg, 2.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Modrá 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 Modrá water?
2.9 gpg, equal to 2.7 °dH, 4.9 °fH or 49 mg/L calcium carbonate.
What dishwasher salt setting should I use in Modrá?
For 49 mg/L (2.7 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Modrá?
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