No single water brand is definitively “the healthiest” because what makes water beneficial depends on what you’re looking for: mineral content, absence of contaminants, or simply clean hydration. Most bottled water in the U.S. meets strict FDA safety standards, so the real differences come down to mineral profiles, water source, and processing methods. Those differences are smaller than marketing would have you believe, but they do exist.
What Actually Makes One Water “Healthier”
Water quality comes down to three things: what’s in it that helps you (minerals like calcium, magnesium, and potassium), what’s in it that could harm you (contaminants like lead, PFAS, and microplastics), and how well it hydrates you. Every bottled water brand sold in the U.S. must meet FDA safety thresholds, including a lead limit of 5 parts per billion. That baseline means almost any brand on a store shelf is safe to drink. The health differences between brands are marginal for most people.
That said, if you’re choosing between brands and want to optimize, mineral content is where the meaningful variation shows up.
Mineral Content Varies More Than You’d Think
Your body needs calcium, magnesium, and potassium every day, and water can contribute a small but real portion of your intake. The differences between brands are significant. Evian, sourced from the French Alps, contains about 51.7 mg/L of calcium, one of the higher levels among widely available brands. Mountain Valley Spring Water, bottled in Arkansas, contains 67 mg/L of calcium, 7.1 mg/L of magnesium, and 1.3 mg/L of potassium, with a total dissolved solids (TDS) level of 220 mg/L and a slightly alkaline pH of 7.3.
European mineral waters like Gerolsteiner tend to have even higher mineral concentrations because European regulations define “mineral water” more strictly, requiring a natural mineral source. In contrast, a brand like Dasani or Aquafina uses purified municipal water with minerals added back in, resulting in a more controlled but typically lower mineral profile.
For context, TDS is a measure of everything dissolved in water, mostly minerals. The World Health Organization rates water with TDS below 300 mg/L as “excellent” tasting, 300 to 600 mg/L as “good,” and anything above 1,200 mg/L as unacceptable. Water with extremely low TDS can taste flat and bland. The WHO does not set a health-based guideline for TDS, meaning there’s no magic number to aim for. A range of roughly 100 to 300 mg/L gives you a decent mineral contribution without affecting taste.
Spring Water vs. Purified Water
Spring water comes from underground aquifers where it filters naturally through layers of limestone, sandstone, and clay. This process gives it a mineral profile that varies by geography. Purified water starts as tap water and goes through mechanical filtration, often reverse osmosis, which strips out contaminants but also removes beneficial minerals. Some brands add minerals back after purification; others don’t.
Neither type is inherently safer. Both must meet the same FDA and EPA standards. The practical difference is nutritional: spring water and mineral water deliver trace minerals your body can use, while heavily purified water delivers close to none. If your diet is already rich in calcium and magnesium from food, this barely matters. If you eat a limited diet or have higher mineral needs, choosing a mineral-rich water is a simple way to supplement your intake without thinking about it.
Contaminant Testing: PFAS and Microplastics
PFAS, sometimes called “forever chemicals,” are a growing concern in all drinking water. The FDA tested 197 bottled water samples collected from U.S. retail locations between 2023 and 2024, covering purified, artesian, spring, and mineral waters. Only 10 of those samples had detectable PFAS levels, and none exceeded the maximum contaminant levels the EPA has set for public drinking water. Of the 10 positive samples, domestic brands (purified and spring water) showed one to four types of PFAS per sample, while two imported artesian water samples showed one to two types each.
The FDA did not name specific brands in its report, so there’s no public ranking of which brands tested cleanest. What the data tells you is that the vast majority of bottled water, about 95% of samples, had no detectable PFAS at all. Your odds of picking up a contaminated bottle are low regardless of brand.
Microplastics are harder to track because standardized testing across brands is still limited. Glass-bottled water generally contains fewer microplastics than plastic-bottled water, simply because the container itself is a source. Mountain Valley Spring Water, for example, is available in glass bottles, which is one reason it frequently appears on “healthiest water” lists.
Does Alkaline Water Offer Extra Benefits?
Alkaline water, with a pH above 7, is marketed as offering benefits from better hydration to stronger bones. The evidence is thin. Some studies suggest alkaline water may help slow bone loss, though it’s unclear whether the calcium content of the water, rather than the pH itself, is responsible. A few studies have also linked alkaline water combined with a plant-based Mediterranean diet to reduced acid reflux symptoms, but the research isn’t strong enough to draw firm conclusions.
Your body tightly regulates its own pH through your kidneys and lungs. Drinking water with a pH of 8 or 9 won’t meaningfully shift your blood chemistry. If you enjoy alkaline water and it doesn’t cost you significantly more, it won’t hurt. But paying a premium specifically for a high pH number isn’t supported by current evidence.
Brands Worth Considering
If you want mineral-rich water from a natural source, Mountain Valley Spring Water is a strong option: 67 mg/L calcium, 7.1 mg/L magnesium, a TDS of 220 mg/L, and availability in glass bottles. Evian offers high calcium (51.7 mg/L) and is widely accessible. Gerolsteiner and other European mineral waters provide some of the highest mineral concentrations available but cost more and can be harder to find.
If you primarily want clean, affordable hydration and get plenty of minerals from food, purified brands like Dasani and Aquafina are perfectly safe and inexpensive. Filtered tap water, using a home pitcher or under-sink system, achieves similar results at a fraction of the cost.
For most people, the healthiest water is the one you’ll actually drink enough of. Staying well-hydrated matters far more than the specific brand in your hand. If you want to optimize beyond that, look for a spring or mineral water with a TDS between 100 and 300 mg/L, check that it’s been independently tested, and consider glass over plastic when the option exists.