Water hardness in Tvrdín
1.7 mmol/L hard
Tap water in Tvrdín is hard: 1.7 mmol/L (170 mg/L · 9.9 gpg · 9.5 °dH).
Source: SčVK, Moje obec – kvalita vody (aktuální hodnoty) (2026) · data checked 2026-10-21
Range across supply zones: 162–178 mg/L.
Tvrdín is supplied through the network of Severočeské vodovody a kanalizace (SčVK), which draws on reservoirs and groundwater across northern Bohemia; the exact source for Tvrdín is not confirmed here. The reported value is 170.2 mg/L CaCO₃, with values in the supply ranging from 162.1 to 178.2 mg/L, in the hard band. Visible limescale on kettles and shower screens is likely, so regular descaling helps.
Czech suppliers report "Vápník a hořčík" in mmol/L; the recommended range is 2–3.5 mmol/L.
Water data
| Total hardness | 1.7 mmol/L |
|---|---|
| Calcium (mg/L) | 37.5 |
| Magnesium (mg/L) | 18.4 |
| Utility | Severočeské vodovody a kanalizace, a.s. (SčVK) |
How Tvrdín compares
- Tap water in Tvrdín is 42 % harder than the median of the 1516 cities we track in Czechia (1.2 mmol/L).
- By hardness it ranks 426 of 1516 in Czechia (1 = hardest); 72 % of these cities have softer water.
- In Ústecký kraj it is number 256 of 631 cities; the regional median is 1.31 mmol/L.
- Nearest city with clearly softer water: Kučlín, 3 km away (1.27 mmol/L).
- Nearest city with clearly harder water: Lhenice, 9 km away (5.05 mmol/L).
Ranking of the hardest and softest water in Czechia →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Tvrdín
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Tvrdín water hard or soft?
It is hard: 170 mg/L as CaCO₃ (9.9 gpg, 9.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Tvrdín 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 Tvrdín water?
9.9 gpg, equal to 9.5 °dH, 17 °fH or 170 mg/L calcium carbonate.
What dishwasher salt setting should I use in Tvrdín?
For 170 mg/L (9.5 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Tvrdín?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
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