All bottled water types are sometimes referred to as "spring water" but that's not really accurate. The origin and processing of different types of bottled water actually make them quite different in content and taste.
Spring Water: Ah, the ever-popular "spring water" is defined as bottled water derived from an underground formation from which water flows naturally to the surface of the earth. To qualify as spring water, it must be collected only at the spring or through a borehole tapping the underground formation feeding the spring.
Purified Water: This is a type of drinking water that has been treated with processes such as distillation, deionization or reverse osmosis (we'll get to those terms later). Basically, this just means that the bacteria and dissolved solids have been removed from the water by some process, making it "purified."
Mineral Water: Okay, ready for some science? Mineral water contains not less than 250 parts per million total dissolved solids and is defined by its constant level and relative proportions of mineral and trace elements at the point of emergence from the source. No minerals can be added to the water.
Sparkling Bottled Water: Yes, the fizzy kind. But what makes it fizzy? This type of water contains the same amount of carbon dioxide that it had when it emerged from its source. Sparkling bottled waters may be labeled as sparkling drinking water, sparkling mineral water, sparkling spring water, etc.
Artesian Water/Artesian Well Water: Ready for some more science? Artesian water comes from a well that taps a confined aquifer-a water-bearing underground layer of rock or sand-in which the water level is above the top of the aquifer.
Well Water: This one is pretty easy. Well water is exactly what it sounds like- water from a hole made in the ground that taps the water source.
(Reverse Osmosis. This is a system of water purification which allows pre-filtered water to be forced through a semi-permeable membrane to separate impurities from our drinking water. However, this membrane allows only certain molecules to pass through providing the water pressure is exactly constant)
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