Water hardness in Vojens
6.6 °dH moderately hard
Tap water in Vojens is moderately hard: 6.6 °dH (118 mg/L · 6.9 gpg · 11.8 °fH).
Source: GEUS, Drikkevandets hårdhed i Danmark (Jupiter database), CC BY 4.0 (2017) · data checked 2026-10-20
This figure is over 3 years old; hardness may have changed.
Danish waterworks report hardness in °dH; GEUS classes: soft < 8, medium hard 8–12, fairly hard 12–18, hard 18–30, very hard > 30 °dH. Most Danish tap water is groundwater and hard.
Water data
| Total hardness | 6.6 °dH |
|---|
How Vojens compares
- Tap water in Vojens is 56 % softer than the median of the 388 cities we track in Denmark (14.9 °dH).
- By hardness it ranks 375 of 388 in Denmark (1 = hardest); 3 % of these cities have softer water.
- In South Denmark it is number 98 of 102 cities; the regional median is 13.2 °dH.
- Nearest city with clearly softer water: Brande, 78 km away (4.7 °dH).
- Nearest city with clearly harder water: Haderslev, 12 km away (12.6 °dH).
Ranking of the hardest and softest water in Denmark →
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 Vojens
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °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 Vojens water hard or soft?
It is moderately hard: 118 mg/L as CaCO₃ (6.9 gpg, 6.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Vojens safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Danish waterworks report hardness in °dH; GEUS classes: soft < 8, medium hard 8–12, fairly hard 12–18, hard 18–30, very hard > 30 °dH. Most Danish tap water is groundwater and hard.
How many grains per gallon is Vojens water?
6.9 gpg, equal to 6.6 °dH, 11.8 °fH or 118 mg/L calcium carbonate.
What dishwasher salt setting should I use in Vojens?
For 118 mg/L (6.6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Vojens?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: GEUS, Drikkevandets hårdhed i Danmark (Jupiter database), CC BY 4.0 (2017). Method: figure published by the water supplier. GEUS, Drikkevandets hårdhed i Danmark (Jupiter database), CC BY 4.0 · Outdated figure? Tell us