Water is supposed to be the simplest thing we consume. The premium bottled water industry has transformed it into something that requires a backstory.
Supermarket shelves now distinguish between glacial, iceberg, volcanic, spring, mineral, and alkaline water. Restaurants are introducing water menus, while trained water sommeliers assess bottles by their mineral composition, mouthfeel and provenance. At the extreme end of the category, Svalbarði Polar Iceberg Water sells Arctic water for as much as €100 (around $116) a bottle.
The category’s growth rests on a mixture of verifiable differences and carefully constructed associations. Water can contain different minerals. Those minerals can change how it tastes. But claims about purity, alkaline pH, and remote natural sources can also create the impression that expensive water must be healthier.
According to Michael Mascha, who founded the platform FineWaters in 2002 to train water sommeliers and drag premium bottled products out of the commodity aisle, prices often reflect remote sourcing and difficult transport rather than superior health benefits. Luxury water, he argues, is better understood as a dining experience than as a more effective source of hydration.
Does Expensive Water Hydrate You Better?
There is no established evidence that luxury water hydrates an otherwise healthy person better simply because it is more expensive or comes from a celebrated source.
“Fundamentally, true hydration is about consuming enough water throughout the day to replace daily losses rather than brand status or origin,” says Lucy Semerjian, associate professor of environmental science and technology at the University of Sharjah in the United Arab Emirates.
What matters most is drinking enough safe water to replace the fluid the body loses. Its chemical and microbial composition must also remain within safe limits.
Are the Minerals in Bottled Water Better for You?
Minerals are responsible for some of the genuine differences between waters. As water travels through soil and rock, it can absorb calcium, magnesium, bicarbonate, sodium, and other dissolved substances. Their type and concentration depend partly on the geology surrounding the source.
These minerals are already dissolved into ionized forms, meaning the gastrointestinal tract can absorb them. Mineral water can therefore contribute to a person’s calcium or magnesium intake, although its nutritional significance depends on the concentration, the quantity consumed, and the rest of that person’s diet.
The word “mineral,” however, does not tell consumers how much of any particular nutrient is present.
“People see terms like rich in minerals, high TDS numbers, or alkaline pH on a premium label and assume those are automatically markers of superior quality,” says Maria Abi Hanna, cofounder and CEO of nutrition intelligence software Food Label Maker, “when in reality none of those numbers tell you anything on their own.”
Total dissolved solids, or TDS, measures the combined concentration of dissolved substances in water. A higher number does not function as a score for safety, purity, or health. It mainly describes the water’s mineral load.
The same problem applies to alkaline water. Its higher pH is frequently positioned as a wellness advantage, but pH alone does not establish that a bottle is healthier. The stomach is already highly acidic, and the body tightly regulates the pH of the blood.
Consumers should instead look at which minerals appear on the label and in what concentrations. People limiting their sodium intake, for example, may have different priorities from someone specifically looking for a water containing calcium or magnesium.
Does Mineral Content Change How Water Tastes?
Minerals may not transform hydration, but they can transform taste.
“Some waters taste very light because they have very low mineral content,” Mascha says.
Rainwater that has had little contact with the ground may contain very few dissolved minerals. Iceberg and some glacial waters can also fall towards the low end of the TDS scale, producing a relatively light or neutral taste.