Water hardness in Deerlijk
24.9 °fH very hard
Tap water in Deerlijk is very hard: 24.9 °fH (249 mg/L · 14.5 gpg · 13.9 °dH).
Source: VMM, Kwaliteit van het drinkwater per leveringsgebied 2024, bijlage 2 (mediane concentratie) (2024) · data checked 2026-10-19
Range across supply zones: 245–252 mg/L.
Deerlijk in West-Vlaanderen is supplied by De Watergroep. The VMM 2024 median is 248.6 mg/L CaCO₃ (range 244.8–252.3), very hard and consistent across the area. Limescale on taps and in kettles is normal here.
Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.
Water data
| Total hardness | 24.9 °fH |
|---|---|
| Utility | De Watergroep |
How Deerlijk compares
- Tap water in Deerlijk is 21 % softer than the median of the 1091 cities we track in Belgium (31.6 °fH).
- By hardness it ranks 685 of 1091 in Belgium (1 = hardest); 37 % of these cities have softer water.
- In West-Vlaanderen it is number 28 of 58 cities; the regional median is 24.5 °fH.
- Nearest city with clearly softer water: Melle, 36 km away (16.8 °fH).
- Nearest city with clearly harder water: Zulte, 10 km away (39.9 °fH).
Ranking of the hardest and softest water in Belgium →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Deerlijk
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| Hoover | S2 |
| LG | H3 |
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 Deerlijk water hard or soft?
It is very hard: 249 mg/L as CaCO₃ (14.5 gpg, 13.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Deerlijk 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 Deerlijk water?
14.5 gpg, equal to 13.9 °dH, 24.9 °fH or 249 mg/L calcium carbonate.
What dishwasher salt setting should I use in Deerlijk?
For 249 mg/L (13.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Deerlijk?
Yes, unless you are only passing through: scale damages appliances within a few years.
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