Water hardness in Montaigu-Vendée
15.5 °fH hard
Tap water in Montaigu-Vendée is hard: 15.5 °fH (155 mg/L · 9.1 gpg · 8.7 °dH).
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 85146 (2026-08) · data checked 2026-10-19
Range across supply zones: 150–160 mg/L.
Montaigu-Vendée in Vendée is supplied by Suez. Vendée sits largely on the Armorican Massif (granite and schist), which is low in limestone, and local supplies stay moderately hard: 155 mg/L CaCO₃, ranging from 150 to 160 mg/L. A light white deposit forms in kettles.
TH en °fH : douce < 15, moyennement dure 15–25, dure 25–35, très dure > 35 °fH (classes usuelles ARS).
Water data
| Total hardness | 15.5 °fH |
|---|---|
| Utility | Suez |
How Montaigu-Vendée compares
- Tap water in Montaigu-Vendée is 35 % softer than the median of the 33641 cities we track in France (23.9 °fH).
- By hardness it ranks 23974 of 33641 in France (1 = hardest); 28 % of these cities have softer water.
- In Vendée it is number 125 of 217 cities; the regional median is 16 °fH.
- Nearest city with clearly softer water: Arzal, 101 km away (10.2 °fH).
- Nearest city with clearly harder water: La Marne, 33 km away (20.2 °fH).
Ranking of the hardest and softest water in France →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Montaigu-Vendée
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Montaigu-Vendée water hard or soft?
It is hard: 155 mg/L as CaCO₃ (9.1 gpg, 8.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Montaigu-Vendée 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 Montaigu-Vendée water?
9.1 gpg, equal to 8.7 °dH, 15.5 °fH or 155 mg/L calcium carbonate.
What dishwasher salt setting should I use in Montaigu-Vendée?
For 155 mg/L (8.7 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Montaigu-Vendée?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 85146 (2026-08). Method: own measurement. Ministère de la Santé (ARS), contrôle sanitaire SISE-Eaux, commune 85146 · Outdated figure? Tell us