Sainsbury’s Castle Spring
British Still Spring Water
Sainsbury’s Castle Spring is a spring water sourced from Cumbria, England. It is the own-brand budget still water of Sainsbury’s (part of Sainsbury’s plc). The specific spring location and geological context are not published by Sainsbury’s. The water is classified as spring water, not natural mineral water. TDS is reported at approximately 22 mg/L, consistent with the ultra-soft character of many upland Cumbrian spring sources.
Mineral composition
| mg/L | |
|---|---|
| Calcium | awaiting data |
| Magnesium | awaiting data |
| Sodium | awaiting data |
| Sulfate | awaiting data |
| Chloride | awaiting data |
| Bicarbonate | awaiting data |
Mineral data incomplete — check the label for full composition.
Compositions can vary by season and source. Read our methodology.
Mineral character
The mineral profile for Sainsbury’s Castle Spring in the TWD database is currently incomplete: no individual ion values are recorded. The reported TDS of approximately 22 mg/L indicates an extremely soft water, broadly comparable to Waitrose Essential (Lockhills), another Cumbrian spring water with a very soft profile. Without ion data, the individual character of the profile cannot be described. What can be inferred is that all six ions are likely very low.
Use-case suitability
- CoffeeProfile incomplete; suitability cannot be assessed.
- TeaProfile incomplete; suitability cannot be assessed.
- BrewingProfile incomplete; suitability cannot be assessed.
- BakingProfile incomplete; suitability cannot be assessed.
- AquariumProfile incomplete; suitability cannot be assessed.
- HorticultureProfile incomplete; suitability cannot be assessed.
Where to buy
UK
Sainsbury’s
£0.15-0.22 per litre
Sainsbury’s Castle Spring is available exclusively at Sainsbury’s stores in the UK, typically £0.15–0.22 (as of March 2026). Among the lowest-priced bottled waters in the UK. Sold in still format.