Water hardness in Florennes
20.5 °fH very hard
Tap water in Florennes is very hard: 20.5 °fH (205 mg/L · 12 gpg · 11.5 °dH).
Source: SPW, qualité de l'eau potable par zone de distribution, année civile 2025 (2025) · data checked 2026-10-19
Range across supply zones: 100–311 mg/L.
Florennes, in Namur province, is supplied by INASEP. The SPW 2025 report gives 205 mg/L CaCO₃, but zone values span a wide range, from 99.5 to 310.5 mg/L. Hardness can differ a lot between neighbourhoods, so check your own address.
Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.
Water data
| Total hardness | 20.5 °fH |
|---|---|
| Utility | INASEP |
How Florennes compares
- Tap water in Florennes is 35 % softer than the median of the 1091 cities we track in Belgium (31.6 °fH).
- By hardness it ranks 770 of 1091 in Belgium (1 = hardest); 29 % of these cities have softer water.
- In Namur it is number 124 of 137 cities; the regional median is 32.3 °fH.
- Nearest city with clearly softer water: Neuville, 11 km away (9.9 °fH).
- Nearest city with clearly harder water: Morialmé, 4 km away (31.6 °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 Florennes
| Brand | Setting for this water |
|---|---|
| Bosch | H03 |
| Miele | 11 °dH |
| AEG / Electrolux | 3 |
| 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 Florennes water hard or soft?
It is very hard: 205 mg/L as CaCO₃ (12 gpg, 11.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Florennes 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 Florennes water?
12 gpg, equal to 11.5 °dH, 20.5 °fH or 205 mg/L calcium carbonate.
What dishwasher salt setting should I use in Florennes?
For 205 mg/L (11.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Florennes?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: SPW, qualité de l'eau potable par zone de distribution, année civile 2025 (2025). Method: figure published by the water supplier. SPW, qualité de l'eau potable par zone de distribution, année civile 2025 · Outdated figure? Tell us