Water hardness in Vauréal
35 °fH very hard
Tap water in Vauréal is very hard: 35 °fH (350 mg/L · 20.4 gpg · 19.6 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 95637 (2026-06) · data checked 2026-10-19
Range across supply zones: 195–436 mg/L.
Vauréal in Val-d'Oise is served by Cyo'. The Oise bend rests on Paris Basin limestone: 350 mg/L CaCO₃, with a spread from 195 to 436 mg/L. That wide gap is a reason to check the figure for your address before installing a softener.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 35 °fH |
|---|---|
| Utility | Cyo' |
How Vauréal compares
- Tap water in Vauréal is 46 % harder than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 2731 of 33641 in France (1 = hardest); 91 % of these cities have softer water.
- In Val-d'Oise it is number 52 of 149 cities; the regional median is 30.6 °fH.
- Nearest city with clearly softer water: Jouy-le-Moutier, 3 km away (22.1 °fH).
- Nearest city with clearly harder water: Gressy, 47 km away (56.2 °fH).
Ranking of the hardest and softest water in France →
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 Vauréal
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 5th |
| Hoover | S3 |
| 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 Vauréal water hard or soft?
It is very hard: 350 mg/L as CaCO₃ (20.4 gpg, 19.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Vauréal safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
How many grains per gallon is Vauréal water?
20.4 gpg, equal to 19.6 °dH, 35 °fH or 350 mg/L calcium carbonate.
What dishwasher salt setting should I use in Vauréal?
For 350 mg/L (19.6 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Vauréal?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 95637 (2026-06). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 95637 · Outdated figure? Tell us