No single bottled water brand is meaningfully healthier than the rest. The differences between major brands come down to mineral content, pH, water source, and packaging, and none of these factors have a large enough impact on health to crown a winner. What matters more is understanding what separates the categories so you can pick a water that fits your preferences without overpaying for marketing claims.
Three Types of Bottled Water, Explained
The FDA regulates bottled water under three main categories, and the label on your bottle tells you which one you’re drinking. Purified water has been processed through distillation, reverse osmosis, or similar filtration to strip out dissolved solids. Brands like Aquafina and Dasani fall here. The water is clean, but it’s also essentially blank, with most naturally occurring minerals removed.
Spring water comes from an underground formation where water flows naturally to the surface. It retains some of its original mineral profile. Poland Spring, Deer Park, and Evian are common examples. Mineral water is similar but must contain at least 250 parts per million of total dissolved solids from its natural source. Those minerals can’t be added after the fact. Brands like Evian and Gerolsteiner qualify. The minerals you’ll find, primarily calcium, magnesium, and bicarbonate, do contribute to your daily intake, though the amounts are modest compared to food.
Why pH Doesn’t Matter Much
Bottled water pH varies widely across brands. Aquafina tests around 5.5 (mildly acidic), Poland Spring sits at 7.2 (neutral), Evian comes in at 7.9, and brands marketed as alkaline water, like Essentia, reach 9.4 or higher. Some products push past pH 10.
Despite the marketing, Harvard Health has been clear on this point: there is no evidence to support choosing alkaline water over regular bottled water or safe tap water. Your stomach acid is so strong that any pH difference in the water you drink is neutralized almost immediately. Even if alkaline water slightly raised your blood pH, your kidneys would rebalance it within minutes. The one modest benefit researchers have noted is temporary relief from acid reflux symptoms, but that’s a short-lived effect, not a health advantage.
For people with kidney disease, alkaline water could actually cause problems by pushing blood pH higher and disrupting normal levels of electrolytes like potassium. In short, pH is not a useful way to evaluate how healthy a water brand is.
What’s Actually in the Bottle
A large study published in ACS ES&T Water tested 107 samples across 26 U.S. bottled water brands for bacteria, heavy metals, disinfection byproducts, and other contaminants. The results were reassuring overall: no spring water samples exceeded federal limits for heavy metals, and only one purified water sample exceeded the threshold for cadmium. But the details reveal some interesting patterns.
Spring water samples tended to have higher average concentrations of chromium and arsenic compared to purified water. That makes sense, since spring water retains minerals from its source geology, and not all of those minerals are beneficial. Purified water, on the other hand, showed higher average levels of copper, lead, and cadmium, likely picked up during processing or packaging rather than from the water source itself.
Perhaps the most striking finding was how much variation existed within the same brand. Concentrations of calcium, disinfection byproducts, and trace metals differed considerably from bottle to bottle of the same product. This means the specific bottle you grab off the shelf may not perfectly match the brand’s reputation or water quality report. Consistency varies, and some brands showed much wider swings than others.
The Plastic Problem
Most bottled water comes in PET plastic, and the container itself introduces contaminants the water source never contained. Research has found that water sold in PET bottles contains a median antimony concentration roughly 21 times higher than water in other packaging types. One comparison of German brands available in both glass and PET found up to 30 times more antimony in the plastic-bottled version. Antimony is a metal used as a catalyst in PET manufacturing, and it leaches into the water over time, especially in warm conditions. It has been flagged as a potential endocrine disruptor.
Microplastics are the other concern. A study from Ohio State University found that bottled water contained three times as many nanoplastic particles as treated tap water. Over half of all particles detected were nanoplastics, particles so small they can cross biological barriers in the body. The long-term health effects of ingesting nanoplastics are still being studied, but the exposure is real and measurable.
If minimizing chemical leaching matters to you, water sold in glass bottles or in non-PET plastics (like HDPE) consistently shows lower contamination. Bottles made from polycarbonate, HDPE, and polystyrene all exhibited significantly lower antimony and bromine leaching than PET in controlled testing. Alternatively, filtering tap water at home and using a reusable stainless steel or glass bottle sidesteps the issue entirely.
How Major Brands Compare
Here’s a practical breakdown of widely available brands across the categories that actually matter:
- Evian (pH 7.9, mineral/spring): naturally high in calcium and bicarbonate, consistent mineral profile from its Alpine source. Sold in PET, so it carries the same plastic leaching concerns as other brands.
- Fiji (pH 7.3, spring): contains silica from volcanic rock filtration, moderate mineral content. Ships from the South Pacific, which makes it one of the least sustainable options.
- Poland Spring (pH 7.2, spring): neutral pH, light mineral content, widely available in the northeastern U.S. A straightforward spring water without premium pricing.
- Smartwater (pH 7.6, purified): vapor-distilled with electrolytes added back. The mineral content is engineered rather than natural, and the amounts are small.
- Aquafina (pH 5.5, purified): reverse-osmosis purified municipal water. Very clean but acidic and essentially mineral-free.
- Dasani (pH 5.6, purified): similar to Aquafina with a small mineral blend added for taste. Also on the acidic side.
- Essentia (pH 9.4, ionized): marketed as alkaline performance water. The high pH has no proven health benefit for most people.
- Voss (pH 7.6, spring): available in glass bottles, which reduces plastic leaching. The water itself is low in minerals and similar in quality to other neutral-pH spring waters.
What Actually Makes a Difference
The healthiest choice has less to do with which brand you pick and more to do with a few practical decisions. First, drinking enough water matters far more than the source. Most adults fall short of adequate hydration, and any clean water fixes that problem regardless of the label.
Second, if you’re buying bottled water regularly, the container matters more than the water inside it. Choosing glass bottles or filtering your own tap water into a reusable bottle reduces your exposure to both antimony and microplastics. If you do buy plastic bottles, store them in cool, dark places and don’t leave them in a hot car, since heat accelerates chemical leaching.
Third, mineral water or spring water with a moderate mineral profile gives you a small nutritional edge over purified water, particularly for calcium and magnesium. This won’t replace a balanced diet, but it’s a reasonable tiebreaker if you’re choosing between two products at the same price. Purified water brands that strip everything out and add back a pinch of electrolytes are giving you marketing, not meaningful nutrition.
For most people, filtered tap water in a reusable glass or steel bottle is cheaper, lower in microplastics, and just as safe as any premium brand on the shelf.