Calistoga Brand Sparkling Mineral Water comes from a source deep in the earth, below the small town of Calistoga in Californias Upper Napa Valley. Geothermal forces and the rock strata contribute to Calistoga Brand Sparkling Mineral Waters mineral base, which imparts a distinctive, refreshing taste. Geothermal forces naturally heat the water to its boiling point, so it must be cooled to 36 degrees Fahrenheit before it is bottled.