Naturally occurring at the source in mg/Liter: Calcium (69-74); Magnesium (7.2-13); Potassium (0.9-1.2); Total Dissolved Solids (220-230). Since 1871 America's premium water. The mountain valley is America’s original premium spring water. Mountain valley spring water has been nationally recognized and awarded multiple times for its refreshing taste and exceptional quality. Its balanced, crisp taste and purifying power comes from the rich, unique blend of minerals the spring flows through. And since 1871, we have bottled it right here, in a remote valley of the Ouachita (WASH-ah-taw) mountains, USA. NSF Certified. MountainValleySpring.com. We gladly provide additional consumer information relating to water quality at: MountainValleySpring.com. 800-643-1501. This bottle made with recycled glass. Bottled in the Ouachita Mountains - USA. Source: Garland County, Arkansas.