Water hardness in Challans
22.7 °fH very hard
Tap water in Challans is very hard: 22.7 °fH (227 mg/L · 13.3 gpg · 12.7 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 85047 (2026-08) · data checked 2026-10-19
Range across supply zones: 182–271 mg/L.
In Challans (Vendée), water supplied by Saur has a median hardness of 227 mg/L as CaCO₃, with a wide spread from 182 to 271 mg/L. It is classed as very hard. Data from the SISE-Eaux sanitary control (ARS, commune 85047), August 2026, measured. The actual tap value therefore depends on the supply point.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 22.7 °fH |
|---|---|
| Utility | Saur |
How Challans compares
- Tap water in Challans is 5 % softer than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 18114 of 33641 in France (1 = hardest); 46 % of these cities have softer water.
- In Vendée it is number 2 of 217 cities; the regional median is 16 °fH.
- Nearest city with clearly softer water: Sallertaine, 6 km away (17.9 °fH).
- Nearest city with clearly harder water: Fay-de-Bretagne, 64 km away (39.1 °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 Challans
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 13 °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 Challans water hard or soft?
It is very hard: 227 mg/L as CaCO₃ (13.3 gpg, 12.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Challans 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 Challans water?
13.3 gpg, equal to 12.7 °dH, 22.7 °fH or 227 mg/L calcium carbonate.
What dishwasher salt setting should I use in Challans?
For 227 mg/L (12.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Challans?
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 85047 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 85047 · Outdated figure? Tell us