Plancoët
Plancoët is a natural mineral water from the Sassay spring in Plancoët, Côtes-d’Armor, Brittany. It is the only commercially bottled natural mineral water from Brittany and has held official NMW recognition since 1928. The source is accessed from a depth of approximately 110 m. The brand operates under Compagnie Fermière de Sassay.
Mineral composition
| mg/L | |
|---|---|
| Calcium | 24 |
| Magnesium | 16 |
| Sodium | 32 |
| Sulfate | 50 |
| Chloride | 38 |
| Bicarbonate | 121 |
Compositions can vary by season and source. Read our methodology.
Mineral character
Calcium is 24 mg/L, magnesium 16 mg/L, sodium 32 mg/L, sulphate 50 mg/L, chloride 38 mg/L, and bicarbonate 121 mg/L. Hardness is 126 mg/L as CaCO₃. The most distinctive feature is the pH of 4.6 — strongly acidic relative to almost all commercial mineral waters — combined with confirmed zero nitrate. Sulphate and chloride are relatively elevated for a still French water, reflecting the specific geological conditions at depth. Bicarbonate is the dominant anion but low in absolute terms for a water at this pH.
Use-case suitability
- CoffeeAppears in blends for London and Tokyo.
- TeaNot used in any current tea recipe. Hardness 126 mg/L is above the 37–59 mg/L range of these targets.
- BrewingAppears in blends for Dortmund, Dublin, Edinburgh, Kölsch (Cologne), and NEIPA.
- BakingAppears in blends for Montreal Bagel, Neapolitan Pizza (Naples), New York Bagel, and Paris Baguette.
- AquariumAppears in blends for African Cichlids.
- HorticultureNot used in any current horticulture recipe. Hardness 126 mg/L is above the 12–54 mg/L range of these targets.
Used in these recipes
African Cichlids
Lake Malawi / Tanganyika
33% in blend
FR
Dortmund
Dortmund, DE
17% in blend
FR
Dublin
Dublin, IE
29% in blend
FR
Edinburgh
Edinburgh, UK
76% in blend
FR
Kölsch (Cologne)
Kölsch (Cologne), DE
92% in blend
FR
London
London, UK
51% in blend
FR
Montreal Bagel
Montreal Bagel, CA
43% in blend
FR
Neapolitan Pizza (Naples)
Neapolitan Pizza (Naples), IT
65% in blend
FR
NEIPA
NEIPA, US
86% in blend
FR
New York Bagel
New York Bagel, US
27% in blend
FR
Paris Baguette
Paris Baguette, FR
17% in blend
FR
Tokyo
Tokyo, JP
33% in blend
FR
Where to buy
FR
Carrefour, Leclerc, Auchan, Intermarché
€0.40-0.60 per litre
Available across French supermarkets including Carrefour, Leclerc, Auchan, and Intermarché. Not widely available outside France. As of March 2026.