Bottled water from a well that taps a confined aquifer in which water stands at some height above the aquifer. These wells are created when pressure builds from beneath the earth’s surface and forces water to flow to the surface.

Another name for bottled water; sold for human consumption in sanitary containers and has no sweeteners or chemical additives. It must be calorie-free and sugar-free. Flavors or essences may be added to the water, but they must comprise less than one percent by weight of the final product.

Water that comes from a source tapped at one or more bore holes or springs, which comes from a geologically and physically protected underground water source. Mineral water is distinguished from other types of bottled water by its constant level of mineral and other trace elements at the point of emergence (bore hole or spring) from the source. No minerals can be added to this product to be classified as "mineral water."

Water produced by distillation, deionization, reverse osmosis, or other suitable processes that meet the definition of purified water in the United States Pharmacopeia, a non-government organization that develops standards to ensure the quality of medicines and healthcare technologies. Purified water can also be called "distilled water," "deionized water," or "reverse osmosis water," depending on the process used.

Bottled water that contains the same amount of carbon dioxide that it had directly at the source. This category does not include "soda water" or "seltzer water."

Water from an underground formation that flows naturally to the surface and is collected at the spring or through a sanitary bore hole.

Water from a hole that is drilled into the earth to obtain water contained in an aquifer.