Water hardness in Sint-Gillis-Waas
24.5 °fH very hard
Tap water in Sint-Gillis-Waas is very hard: 24.5 °fH (245 mg/L · 14.3 gpg · 13.7 °dH).
Source: VMM, Kwaliteit van het drinkwater per leveringsgebied 2024, bijlage 2 (mediane concentratie) (2024) · data checked 2026-10-19
Range across supply zones: 234–255 mg/L.
De Watergroep supplies 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 244.6 mg/L CaCO₃, within a reported range of 234.4 to 254.8 mg/L, so the exact value depends on your street. At this level limescale builds up quickly in kettles, boilers and washing machines, so descaling and a softener are worth considering.
Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.
Water data
| Total hardness | 24.5 °fH |
|---|---|
| Utility | De Watergroep |
How Sint-Gillis-Waas compares
- Tap water in Sint-Gillis-Waas is 22 % softer than the median of the 1091 cities we track in Belgium (31.6 °fH).
- By hardness it ranks 695 of 1091 in Belgium (1 = hardest); 36 % of these cities have softer water.
- In Oost-Vlaanderen it is number 23 of 54 cities; the regional median is 19.7 °fH.
- Nearest city with clearly softer water: Sint-Niklaas, 6 km away (18.4 °fH).
- Nearest city with clearly harder water: Nieuwerkerken, 34 km away (32 °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 Sint-Gillis-Waas
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| 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 Sint-Gillis-Waas water hard or soft?
It is very hard: 245 mg/L as CaCO₃ (14.3 gpg, 13.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sint-Gillis-Waas 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 Sint-Gillis-Waas water?
14.3 gpg, equal to 13.7 °dH, 24.5 °fH or 245 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sint-Gillis-Waas?
For 245 mg/L (13.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Sint-Gillis-Waas?
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