Mountain Valley Spring Water is a solid choice for drinking water. It delivers a meaningful amount of calcium, has a naturally alkaline pH between 7.3 and 7.8, and tests well below legal limits for contaminants like arsenic, fluoride, and heavy metals. Its glass bottle option also eliminates concerns about plastic chemicals leaching into the water. That said, it’s not a miracle product, and most of its benefits come down to good hydration with a clean mineral profile.
What’s Actually in the Water
Mountain Valley sources its water from a spring in the Ouachita Mountains of Arkansas, and the geology of that region shapes what ends up in the bottle. The water contains about 67 mg/L of calcium, which is notable for a spring water. That’s roughly 5 to 7 percent of your daily calcium needs per liter, a small but real contribution if you’re drinking several glasses a day. Magnesium comes in at 5.7 mg/L, which is modest. Potassium was not detected in lab analysis, so this isn’t a meaningful source of that mineral.
For context, mineral water brands from volcanic regions in Europe often carry higher magnesium levels, sometimes above 100 mg/L. Mountain Valley’s mineral profile is lighter than those options but richer than most domestic spring waters, which can be nearly mineral-free.
Does the Alkaline pH Matter?
Mountain Valley’s natural pH of 7.3 to 7.8 puts it slightly above neutral (7.0), making it mildly alkaline. This is different from brands that artificially raise pH through electrolysis or added minerals. The alkalinity here comes from the calcium and other dissolved minerals picked up as the water moves through rock.
Whether alkaline water offers real health advantages is still an open question. Some research suggests it may help relieve acid reflux symptoms, particularly alongside a plant-based diet. There’s also preliminary evidence that alkaline water could slow bone loss, though it’s unclear whether the calcium content of the water itself drives that effect or whether the pH plays an independent role. The Mayo Clinic notes that more research is needed on both fronts before making firm claims. Your body tightly regulates its own blood pH regardless of what you drink, so alkaline water won’t fundamentally shift your internal chemistry. Still, if you experience occasional heartburn, a mildly alkaline water is unlikely to aggravate it the way acidic beverages can.
Contaminant Testing Results
Mountain Valley’s water tests well within federal safety limits for regulated contaminants. Fluoride measured at 0.222 ppm, far below the legal limit of 4 ppm. This is low enough that the water won’t contribute significant fluoride exposure but also won’t provide the cavity-prevention benefit of fluoridated tap water. If you rely on bottled water as your primary source, your dentist may recommend fluoride supplements or treatments for children.
Arsenic was detected at 1.30 parts per billion, comfortably below the legal limit of 10 ppb. It’s worth noting that the Environmental Working Group’s more conservative health guideline sits at 0.004 ppb, a threshold so low that virtually no natural water source meets it. Barium tested at 96.8 ppb against a legal limit of 2,000 ppb, and selenium at 0.700 ppb against a limit of 50 ppb. Several heavy metals, including cadmium, mercury, chromium, and thallium, were not detected at all.
In practical terms, these numbers reflect a clean water source. No bottled or tap water is perfectly free of trace elements, and Mountain Valley’s levels are low across the board.
The Glass Bottle Advantage
One of Mountain Valley’s distinctive selling points is its glass bottles, which the brand has used since the 1870s. Glass is chemically inert, meaning it doesn’t react with the water inside and won’t leach any compounds into it. This holds true even at high temperatures, so a glass bottle left in a hot car won’t release chemicals the way plastic can.
This matters because plastic bottles, especially when exposed to heat or sunlight, can release microplastics and chemical additives into the water. Recent studies have found tens of thousands of micro- and nanoplastic particles in typical plastic-bottled water. If minimizing plastic exposure is a priority for you, glass is the cleanest option available. Mountain Valley does also sell water in plastic containers, so check the packaging if this is important to you.
How It Compares to Tap Water
Whether Mountain Valley is “better” than your tap water depends entirely on where you live. Municipal water in most U.S. cities meets the same federal safety standards and often contains added fluoride for dental health. Some tap water sources have higher mineral content than Mountain Valley. The real advantages of this spring water are consistency (the source doesn’t change), the absence of chlorine or chloramine disinfection byproducts, and the glass packaging option.
If your local tap water tastes fine and tests clean, Mountain Valley is a premium preference rather than a health necessity. If you live in an area with known water quality issues, or if you simply want to avoid the disinfection chemicals present in municipal water, it’s a trustworthy alternative. The calcium content is a genuine nutritional bonus over purified or reverse-osmosis bottled waters, which strip minerals out entirely.
Who Benefits Most
Mountain Valley is a particularly good fit if you’re looking for a bottled water with natural minerals rather than a “dead” purified water. People who are mildly calcium-deficient, those avoiding plastic packaging, or anyone who prefers a slightly alkaline water for taste or digestive comfort will get the most value from it. It’s also one of the few widely available U.S. spring waters with a long track record and transparent quality reporting.
It won’t replace a balanced diet for mineral intake, and its alkaline pH isn’t a cure for anything. But as bottled waters go, it’s cleaner than most, more mineral-rich than many, and available in packaging that won’t add unwanted chemicals to your water.