Naturally Occurring Minerals & Electrolytes mg/L: 42 - 51 calcium; 1.6 - 6.8 magnesium; 1.0 - 1.3 potassium; 7.6 - 12.0 silica; 7.8 - 8.5 pH; 98 - 145 bicarbonates; 152 - 167 TDS; 4.1 - 4.6 chlorides. Naturally occurring minerals & electrolytes. Alkaline: 8.1 +/- pH. Natural alkaline spring water. Fund outdoor cleanups. proudsourcewater.com. For questions, information, or a report on water quality, contact: 855-H2-PR-O-UD or proudsourcewater.com. Certified B Corporation. Infinitely recyclable aluminum. Please recycle. Sourced and bottled in the USA. Bottled at the source Mackay Springs, Custer County, ID and Waddell Springs, Jackson County, FL.