Water hardness in Rochefort
26.7 °fH very hard
Tap water in Rochefort is very hard: 26.7 °fH (267 mg/L · 15.6 gpg · 15 °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: 11–343 mg/L.
In Rochefort (province of Namur) water is distributed by the municipal service. The SPW reports a 2025 median of 267 mg/L CaCO₃, with a very wide range of 11 to 343 mg/L by zone: some zones get almost soft water, others very hard. Check the zone for your address. The data do not say what resources feed each zone.
Belgian suppliers report hardness in °f (French degrees); 1 °f = 10 mg/L CaCO₃.
Water data
| Total hardness | 26.7 °fH |
|---|---|
| Utility | ROCHEFORT |
How Rochefort compares
- Tap water in Rochefort is 15 % softer than the median of the 1091 cities we track in Belgium (31.6 °fH).
- By hardness it ranks 648 of 1091 in Belgium (1 = hardest); 41 % of these cities have softer water.
- In Namur it is number 99 of 137 cities; the regional median is 32.3 °fH.
- Nearest city with clearly softer water: On, 5 km away (12 °fH).
- Nearest city with clearly harder water: Han-sur-Lesse, 5 km away (35.5 °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 Rochefort
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| 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 Rochefort water hard or soft?
It is very hard: 267 mg/L as CaCO₃ (15.6 gpg, 15 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rochefort 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 Rochefort water?
15.6 gpg, equal to 15 °dH, 26.7 °fH or 267 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rochefort?
For 267 mg/L (15 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Rochefort?
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