The spring was first tapped in 1918, to provide a supply of fresh water to a US Air Force airfield. After the war, the water was used to supply local houses and even a local ice factory. Today the demand is so great that the spring is licensed to supply 45 million litres a year. In 1990 the Windsor family decided to uncap the well and share this quality source of Natural Mineral Water with the rest of the UK.
To obtain Natural Mineral Water status, the source from which you draw water must produce water of a constantly high quality that conforms to EEC standard 80/777/EEC. This means that over a long period of testing the range of micro biological results can only fluctuate between certain limits - unlike Spring Water or other named waters. THE Natural Mineral Water of Windsor House has remained stable to this day – confirmed by full external microbiological examination.
The Natural Mineral Water is drawn from over 400ft underground, enriched with minerals deep from within the Sussex Downs and is untouched at source – producing water of unrivalled quality and taste.
Technical Data:
Windsor Water is low in sodium and has a pH value of 7.3.
The officially recognised analysis of 31st July 1992:
  • Calcium 96.0mg/1
  • Magnesium <5.0mg/1
  • Potassium <1.2mg/1.
  • Sodium 10.0mg/1
  • Hydrogen Carbonate 214.0mg/1
  • Chloride 16.8mg/1
  • Fluoride 0.1mg/1
  • Nitrate - N 2.6mg/1
  • Sulphate <10.0mg/1

Our latest analysis shows the source to remain stable and of the above quality.