Geothermal. Deep - Protected - Pure. Granite Batholith - Protected Source. 2.2 Miles Deep: Trinity source water flows from a natural spring that is an astonishing 2.2 miles deep. The spring is geothermal (hot) and reaches temperatures of 300 degrees F at depth. Protected: For over 16,000 years, in an energizing environment of crystal-lined faults, this flawlessly pure water is protected by 23,000 square miles of granite known as the Idaho Batholith. Naturally Occurring Fluoride: 1.2 mg/liter. Naturally High pH: 9.0. Certified Source for Natural Purity: Trinity's source, near the Trinity Mountains in Paradise, Idaho, is the first U.S. bottled water source to be certified for natural purity by one of the world's leading certifiers: Quality Assurance International.