Mountain Valley Spring Water is a premium American spring water sourced from a protected 633-acre forest near Hot Springs National Park in Arkansas. The water originates from a granite and marble aquifer 1,600 feet below the surface and travels through natural filters of shale, sandstone, and limestone over approximately 3,500 years, acquiring beneficial trace minerals along the way.

This 12-pack of 750ML bottles features water with a naturally alkaline pH of 7.3-7.8 and a TDS (total dissolved solids) level of 220 mg/L, which falls within the World Health Organization's "excellent" range for drinking water. The mineral profile includes calcium (71 mg/L), magnesium (8 mg/L), potassium (1 mg/L), sodium (3 mg/L), silica (18 mg/L), and bicarbonates (176 mg/L). The water is classified as "Very Hard" with a hardness of 210 mg/L.

Mountain Valley has been bottling spring water since 1871, making it one of America's oldest bottled water brands. The company is known for its commitment to glass packaging for purity, though this Costco product comes in 100% recyclable aluminum bottles for convenience and portability. The bottles are easy to carry and store, making them perfect for outdoor adventures and everyday hydration.