Radnor Hills
Spring water from a borehole on the Watkins family farm at Heartsease, near Knighton, Powys, originally drilled to water livestock. The brand launched in 1990 and everything is bottled on the farm. The source is on Defra’s register as natural mineral water, but a May 2017 trade report records the company moving “from mineral to spring water” and every current product is labelled spring water, so we classify it as spring water. Radnor Hills Mineral Water Company Ltd is a large UK contract bottler supplying own-label drinks to multiple retailers. In August 2023 it bought Highland Spring Group’s Blaen Twyni site at Glyntawe, the register’s “Crystal Falls” source.
Mineral composition
| mg/L | |
|---|---|
| Calcium | 66 |
| Magnesium | 7 |
| Sodium | 11 |
| Sulfate | 15 |
| Chloride | 18 |
| Bicarbonate | awaiting data |
Mineral data incomplete — check the label for full composition.
Compositions can vary by season and source. Read our methodology.
Mineral character
Moderately hard. Per litre, “as stated on the label”: calcium 66.2 mg, magnesium 7.23 mg, sodium 10.5 mg, sulphate 14.9 mg, chloride 17.98 mg, nitrate 17.1 mg. Hardness is about 195 mg/L as CaCO₃, TDS 200 mg/L, pH 7.6. Bicarbonate isn’t published, so the profile is incomplete. Nitrate is higher than most waters in the database. All four producer product pages print the same figures.
Use-case suitability
- CoffeeNot used in any current coffee recipe, but hardness 195 mg/L sits within the 9–266 mg/L range typical for these targets.
- TeaNot used in any current tea recipe. Hardness 195 mg/L is above the 37–59 mg/L range of these targets.
- BrewingNot used in any current brewing recipe, but hardness 195 mg/L sits within the 26–922 mg/L range typical for these targets.
- BakingNot used in any current baking recipe, but hardness 195 mg/L sits within the 46–390 mg/L range typical for these targets.
- AquariumNot used in any current aquarium recipe, but hardness 195 mg/L sits within the 35–212 mg/L range typical for these targets.
- HorticultureNot used in any current horticulture recipe. Hardness 195 mg/L is above the 12–54 mg/L range of these targets.
Where to buy
UK
Producer webshop, One Stop, Wholesale (AF Blakemore, Country Choice)
£14.99 per 24 x 500 ml (producer webshop, 2026-10-13) per litre
Plain water is sold on the producer webshop (24 × 500 ml still £14.99, 24 × 330 ml cans £18.89, 13 October 2026), at One Stop and through wholesalers. Supermarkets stock the flavoured Radnor Splash and Radnor Fizz ranges, not the plain water. Still and sparkling, in cans, PET and Tetra.