The healthiest bottled water is one that contains natural minerals (particularly calcium and magnesium), tests clean for contaminants like arsenic and PFAS, and ideally comes in glass rather than plastic. No single brand wins across every category, but natural mineral water with a total dissolved solids (TDS) level between 300 and 600 mg per liter tends to hit the sweet spot of beneficial minerals and good taste.
What makes water “healthy” goes beyond just being safe to drink. The mineral profile, the packaging material, and how the water was stored all affect what you’re actually putting into your body. Here’s what matters most.
Why Minerals in Water Matter
Water isn’t just hydration. It’s a meaningful source of calcium and magnesium, two minerals most people don’t get enough of from food alone. Epidemiological research across the U.S., Europe, and Russia suggests health benefits kick in at around 20 to 30 mg per liter of calcium and at least 10 mg per liter of magnesium. These thresholds are low enough that many natural spring and mineral waters meet them, but high enough that purified or distilled water falls short.
Your body absorbs minerals from water readily, in some cases more efficiently than from food, because the minerals are already dissolved. That makes the type of water you drink a surprisingly practical way to top off your daily intake, especially for magnesium, which plays a role in muscle function, sleep quality, and blood pressure regulation.
Mineral Water vs. Spring Water vs. Purified Water
In the U.S., the FDA requires water labeled “mineral water” to contain at least 1,500 mg per liter of total dissolved solids. That’s a high bar, and it means true mineral water has a noticeably richer taste and higher concentrations of calcium, magnesium, and bicarbonate. European brands like Gerolsteiner, San Pellegrino, and Evian typically meet this threshold or come close, since Europe classifies any naturally mineralized water as mineral water.
Spring water comes from underground sources and surfaces naturally. It often contains beneficial minerals, but the amounts vary widely depending on the geology of the source. Some spring waters have mineral profiles comparable to mineral water; others are relatively low in dissolved solids. Checking the label for calcium and magnesium content is the only reliable way to tell.
Purified water (including brands like Dasani and Aquafina) starts as tap water and goes through reverse osmosis or distillation to strip out nearly everything. Some brands add small amounts of minerals back for taste, but the result is typically water with very low TDS. The World Health Organization notes that water with extremely low mineral content often tastes flat and insipid. It’s safe, but you’re missing the mineral benefit entirely.
The Best TDS Range for Taste and Health
Total dissolved solids measure everything dissolved in water: minerals, salts, and trace elements. The WHO rates water palatability on a simple scale. Below 300 mg per liter tastes excellent but may be too “empty.” Between 300 and 600 mg per liter is rated good and tends to deliver a satisfying mineral profile. Above 900 gets progressively worse in taste, and anything over 1,200 is generally unacceptable.
For health purposes, that 300 to 600 range is a useful target. It’s high enough to deliver meaningful calcium and magnesium, low enough to taste clean, and well within safe limits. Most quality spring and mineral waters fall in this window. You can find TDS listed on the label or on the brand’s water quality report.
Contaminants to Watch For
Not all bottled water tests equally clean. Consumer Reports found that nearly all noncarbonated bottled water brands had heavy metal levels well below federal safety limits, with one notable exception: Starkey Spring Water (owned by Whole Foods) tested at 9.53 parts per billion of arsenic, just below the federal limit of 10 ppb and more than three times Consumer Reports’ recommended maximum of 3 ppb. If you drink Starkey regularly, that’s worth knowing.
PFAS, the persistent synthetic chemicals sometimes called “forever chemicals,” are another concern. The FDA tested 197 bottled water samples collected from retail locations between 2023 and 2024, including purified, artesian, spring, and mineral waters. Ten samples had detectable PFAS levels, though none exceeded the EPA’s maximum contaminant levels. The detections showed up in both domestic and imported brands, in spring, purified, and artesian water types. The FDA didn’t name specific brands, but the takeaway is that bottled water isn’t automatically PFAS-free.
Plastic Bottles and Chemical Leaching
Most bottled water comes in PET plastic, and the packaging itself can become a source of contamination. A Columbia University study found that a single liter of bottled water can contain as many as 240,000 tiny plastic fragments, a number 10 to 100 times higher than previous estimates. The health effects of ingesting nanoplastics at that scale are still being studied, but the sheer volume is striking.
Heat makes plastic bottles worse. PET bottles contain antimony, a metallic element that leaches into water as temperatures rise. At room temperature, leaching is minimal. But at 60°C (140°F), roughly the temperature inside a car on a hot day, antimony concentrations increased 1 to nearly 11 times compared to pre-storage levels. Some beverages exceeded Japan’s antimony drinking water standard after just seven days at that temperature. The research is clear that high temperature is the primary driver of leaching, not storage time alone.
The practical lesson: never drink from a plastic water bottle that’s been sitting in a hot car, and if you’re buying bottled water regularly, glass bottles eliminate the plastic contamination issue entirely. Brands like Mountain Valley Spring Water, Voss (glass version), and many European mineral waters are available in glass.
Skip the Alkaline Water Hype
Alkaline water, typically marketed with a pH of 8 to 10, is one of the most overhyped categories in the bottled water aisle. Harvard Health Publishing states plainly that there is no evidence to support choosing alkaline water over regular safe drinking water. Your stomach acid is so powerful that it neutralizes the pH difference almost immediately. Even if alkaline water did slightly raise your blood pH, your kidneys would rebalance it within minutes.
The one modest benefit: alkaline water may temporarily ease heartburn symptoms from acid reflux. But that’s a short-lived effect, not a health advantage worth paying a premium for. Water with a pH above 9 can taste bitter, and for people taking proton pump inhibitors for acid reflux, strong alkaline water could actually be dangerous by raising stomach pH too high, potentially altering blood levels of potassium and other electrolytes, especially in people with kidney disease.
What to Look for on the Label
When choosing a bottled water for health, a few quick label checks go a long way:
- Calcium: Look for at least 20 to 30 mg per liter. Higher is fine and potentially beneficial for bone health.
- Magnesium: At least 10 mg per liter. Many people fall short of their daily magnesium needs, so every bit helps.
- TDS: Between 300 and 600 mg per liter balances mineral content with good taste.
- Source type: Natural mineral water or spring water from a named geological source is generally preferable to purified or distilled water.
- Packaging: Glass over plastic when possible. If plastic, store it cool and out of direct sunlight.
Brands that consistently score well on mineral content and purity include Gerolsteiner (high in calcium and magnesium), Mountain Valley Spring Water (glass bottles, clean test results), and Evian (moderate mineral content, widely available). But the best choice is whichever brand you’ll actually drink regularly that checks the boxes above. Staying well hydrated with mineral-rich water matters more than picking the single “perfect” brand.