Water hardness in Denderleeuw
17.5 °fH hard
Tap water in Denderleeuw is hard: 17.5 °fH (175 mg/L · 10.2 gpg · 9.8 °dH).
Source: VMM, Kwaliteit van het drinkwater per leveringsgebied 2024, bijlage 2 (mediane concentratie) (2024) · data checked 2026-10-19
Range across supply zones: 168–182 mg/L.
De Watergroep and Farys supply this part of Flanders with a mix of groundwater and canal-fed surface water, so hardness sits between the soft sandy Campine and the hard chalk areas. The 2024 figure is 175.1 mg/L CaCO₃, within a reported range of 168.0 to 182.2 mg/L, which reflects the different supply areas that serve the town. This is hard water: expect visible limescale on taps and glass, and a shorter life for heating elements unless they are descaled.
Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.
Water data
| Total hardness | 17.5 °fH |
|---|---|
| Utility | De Watergroep, Farys |
How Denderleeuw compares
- Tap water in Denderleeuw is 45 % softer than the median of the 1091 cities we track in Belgium (31.6 °fH).
- By hardness it ranks 837 of 1091 in Belgium (1 = hardest); 23 % of these cities have softer water.
- In Oost-Vlaanderen it is number 36 of 54 cities; the regional median is 19.7 °fH.
- Nearest city with clearly softer water: Tessenderlo, 74 km away (11.4 °fH).
- Nearest city with clearly harder water: Liedekerke, 2 km away (29.2 °fH).
Ranking of the hardest and softest water in Belgium →
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 Denderleeuw
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| 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 Denderleeuw water hard or soft?
It is hard: 175 mg/L as CaCO₃ (10.2 gpg, 9.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Denderleeuw safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.
How many grains per gallon is Denderleeuw water?
10.2 gpg, equal to 9.8 °dH, 17.5 °fH or 175 mg/L calcium carbonate.
What dishwasher salt setting should I use in Denderleeuw?
For 175 mg/L (9.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Denderleeuw?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: VMM, Kwaliteit van het drinkwater per leveringsgebied 2024, bijlage 2 (mediane concentratie) (2024). Method: figure published by the water supplier. VMM, Kwaliteit van het drinkwater per leveringsgebied 2024, bijlage 2 (mediane concentratie) · Outdated figure? Tell us