Mont Roucous
Mont Roucous is sourced from springs in the Lacaune Mountains (Massif Central), within the Haut-Languedoc Regional Nature Park, at approximately 1,000 metres altitude in the Hérault department of southern France. The Roucous family is recorded as drawing water from the source since 1877. The commercial company was formally established in 1977; the brand was sold to Danone in 2000 and returned to independent ownership in 2007. Mont Roucous holds natural mineral water status.
Mineral composition
| mg/L | |
|---|---|
| Calcium | 1 |
| Magnesium | 0 |
| Sodium | 3 |
| Sulfate | 3 |
| Chloride | 3 |
| Bicarbonate | 5 |
Compositions can vary by season and source. Read our methodology.
Mineral character
Mont Roucous is one of the least mineralised waters in the TWD database, comparable in scale to Lauretana (TDS 14 mg/L) and Fastio (TDS ~54 mg/L). All six ions are at or near detection limits: calcium 1.2 mg/L, magnesium 0.2 mg/L, sodium 2.8 mg/L, sulphate 3.3 mg/L, chloride 3.2 mg/L, and bicarbonate 4.9 mg/L. Total hardness is 4 mg/L as CaCO₃; alkalinity is 4 mg/L as CaCO₃. TDS is approximately 15 mg/L. The water has virtually no buffering capacity and functions as a diluent in the same way as Lauretana.
Documented use and context
Mont Roucous is recommended for preparing infant formula by French paediatric authorities. Its very low sodium (2.8 mg/L) and near-zero mineral content make it one of the safest available bottled waters for this application under French infant nutrition guidelines. The brand has been marketed for maternal and infant use throughout its commercial history, and this recommendation is reflected in French retail placement and label messaging.
Use-case suitability
- CoffeeAppears in blends for Melbourne, Portland, and Tokyo.
- TeaUsed neat for Chinese Green Tea and Japanese Green Tea. Also appears in blends for British Black Tea.
- BrewingUsed neat for Pilsen. Also appears in blends for Vienna.
- BakingAppears in blends for Montreal Bagel, New York Bagel, Paris Baguette, and San Francisco Bread.
- AquariumUsed neat for Blackwater Biotope. Also appears in blends for Caridina Shrimp, Discus, Neocaridina Shrimp, and Planted Tank (CO2).
- HorticultureUsed neat for Carnivorous Plants. Also appears in blends for Orchids.
Used in these recipes
Blackwater Biotope
Rio Negro / Amazon
neat
FR
British Black Tea
British Black Tea, GB
50% in blend
FR
Caridina Shrimp
Freshwater shrimp
54% in blend
FR
Carnivorous Plants
Carnivorous Plants, INTL
neat
FR
Chinese Green Tea
Chinese Green Tea, CN
neat
FR
Discus
Amazon basin
50% in blend
FR
Japanese Green Tea
Japanese Green Tea, JP
neat
FR
Melbourne
Melbourne, AU
50% in blend
FR
Montreal Bagel
Montreal Bagel, CA
25% in blend
FR
Neocaridina Shrimp
Freshwater shrimp
25% in blend
FR
New York Bagel
New York Bagel, US
73% in blend
FR
Orchids
Orchids, INTL
67% in blend
FR
Paris Baguette
Paris Baguette, FR
33% in blend
FR
Pilsen
Pilsen, CZ
neat
FR
Planted Tank (CO2)
Freshwater planted
25% in blend
FR
Portland
Portland, US
81% in blend
FR
San Francisco Bread
San Francisco Bread, US
50% in blend
FR
Tokyo
Tokyo, JP
67% in blend
FR
Vienna
Vienna, AT
28% in blend
FR
Where to buy
FR
Carrefour, Leclerc, Auchan, Intermarché
€0.45-0.65 per litre
Mont Roucous is available across France at Carrefour, Leclerc, Auchan, and Intermarché, typically €0.45–0.65 (as of March 2026). Availability outside France is limited. Sold in still format in PET bottles.