According to Highland Spring's website (www.highlandspring.com) in September 2020:
"Every drop of Highland Spring comes from the majestic Ochil Hills, where it is carefully drawn from protected land. We keep the land free from any kind of pollution, pesticides or habitation to ensure the water we draw is as pure as can be. In fact, Highland Spring was the first bottled water brand in the UK to have its catchment area certified as organic by the Soil Association."

Reference:

www.highlandspring.com (28 June 2006)