Waiakea water is a safe, clean drinking water with a modest mineral profile, but its marketed health benefits outpace what the science actually supports. Sourced from volcanic rock in Hawaii, it contains naturally occurring silica, some electrolytes, and a mildly alkaline pH. None of those qualities are unique among bottled waters, and the research behind each claimed benefit is thinner than the branding suggests. That said, a few of the minerals in volcanic water do have interesting, if preliminary, scientific backing worth understanding.
What Is Actually in the Bottle
Waiakea filters through thousands of feet of porous volcanic rock on Mauna Loa, which gives it a naturally occurring mineral load. The brand highlights its silica content, its electrolytes (magnesium, potassium, calcium, sodium), and its pH of roughly 7.6 to 8.2. Compared to heavily processed or reverse-osmosis-purified waters, that mineral content is real. Compared to many European mineral waters that have been studied for decades, the concentrations are relatively low. The silica content, listed around 35 mg/L, is the most distinctive feature from a nutrition standpoint, and that is where the most interesting research exists.
The alkalinity is worth putting in context. A pH of 8.0 is only slightly above neutral (7.0), and well below the pH of common foods like baking soda dissolved in water or many antacids. Your stomach acid sits around pH 1.5 to 3.5, and your body tightly regulates blood pH between 7.35 and 7.45 regardless of what you drink. So while “naturally alkaline” sounds powerful on a label, the actual shift in pH from Waiakea compared to regular filtered tap water is modest.
The Silica Angle
Silica, or dissolved silicon, is the ingredient in Waiakea that has the most credible research behind it, though even here the evidence is preliminary rather than settled. Decades of accumulating data suggest that dietary silicon is beneficial for bone and connective tissue, with strong positive associations found between silicon intake and bone mineral density in both American and British populations. The likely mechanisms involve collagen synthesis and mineralization of bone matrix, though the exact biological pathways are still being worked out.1PubMed Central. Silicon and bone health
A separate and more provocative line of research links silicon-rich water to aluminum removal from the body. A small study found that drinking up to a liter per day of silicon-rich mineral water for 12 weeks helped participants excrete more aluminum through urine, without affecting levels of essential metals like iron and copper. Among participants with Alzheimer’s disease, the reduction in aluminum burden coincided with clinically relevant cognitive improvements in a few individuals.2PubMed. Silicon-rich mineral water as a non-invasive test of the ‘aluminum hypothesis’ in Alzheimer’s disease A longer-term epidemiological study following a French cohort for 15 years found that an increase of 10 mg per day in silica intake was associated with a reduced risk of dementia.3American Journal of Epidemiology. Aluminum and Silica in Drinking Water and the Risk of Alzheimer’s Disease or Cognitive Decline: Findings From 15-Year Follow-up of the PAQUID Cohort Researchers have proposed that silica may act as a natural counterpart to aluminum’s neurotoxicity by reducing its bioavailability in the body.4PubMed. The potential influence of silica present in drinking water on Alzheimer’s disease and associated disorders
These findings are genuinely interesting but come with serious caveats. The silicon-rich mineral waters used in those European studies often had silica concentrations well above what Waiakea contains. The Alzheimer’s study involved only 15 patients and showed cognitive improvement in just three of them. And the epidemiological association between silica intake and dementia risk, while statistically significant, does not prove that drinking any particular brand of water will protect your brain. If you are drawn to Waiakea specifically for its silica, know that the research supports the general category of silicon-rich water, not this product specifically, and the concentrations that showed effects were often higher than what you would get from a single bottle.
Does the Alkaline pH Do Anything
Alkaline water is one of the most aggressively marketed wellness trends of the past decade, and Waiakea leans into it. The claim that alkaline water benefits your health rests on a few threads of real science woven into a much larger fabric of speculation.
The strongest evidence involves acid reflux. Lab research has shown that water at pH 8.8 irreversibly inactivated human pepsin, the stomach enzyme that damages throat tissue in reflux disease, and had a buffering capacity against hydrochloric acid that far exceeded conventional water.5PubMed. Potential benefits of pH 8.8 alkaline drinking water as an adjunct in the treatment of reflux disease A review of the literature confirmed that alkaline water at that pH reduced acid reflux symptoms, particularly in laryngopharyngeal reflux, where stomach acid damages the throat and airway.6Advances in Redox Research. A concise review on health benefits of alkaline reduced water This is a real effect, but Waiakea’s pH typically hovers around 7.6 to 8.2. The studies used water at pH 8.8 or higher. Whether a slightly lower pH delivers the same pepsin-inactivating punch is unclear, and no study has tested Waiakea specifically for reflux.
Beyond reflux, the evidence thins out quickly. A randomized controlled crossover trial in healthy young men found that changing drinking water pH had no impact on the gut microbiota or glucose regulation, contradicting results previously seen in rodents.7PubMed Central. The effect of drinking water pH on the human gut microbiota and glucose regulation: results of a randomized controlled cross-over intervention The researchers found no difference in overall microbial diversity, richness, or community structure between participants drinking alkaline versus neutral water. If alkaline water were reshaping the gut environment in some meaningful way, this study should have picked up a signal, and it did not.
A cross-sectional study of postmenopausal women who regularly drank alkaline water did find associations with lower fasting blood sugar, lower triglyceride-to-HDL ratios, lower diastolic blood pressure, and smaller waist circumference compared to non-drinkers.8PubMed Central. Associations of alkaline water with metabolic risks, sleep quality, muscle strength: A cross-sectional study among postmenopausal women That sounds impressive, but cross-sectional studies can only show correlation. People who choose alkaline water tend to be more health-conscious across the board, and the study cannot separate the water’s effect from dozens of other lifestyle differences. It would be a mistake to attribute those metabolic improvements to the water itself without a controlled trial confirming it.
Electrolytes and Hydration
Waiakea contains trace amounts of magnesium, potassium, calcium, and sodium. The brand positions these as meaningful electrolytes for hydration, which invites comparison to sports drinks or high-mineral European waters. In reality, the concentrations per serving are quite low.
A study on mineral-based alkaline water and hydration found that while mineral water did lower specific urine gravity compared to baseline (a crude marker suggesting the kidneys were processing fluid effectively), total body water showed no significant differences between groups drinking different mineral concentrations.9PubMed Central. The effect of mineral-based alkaline water on hydration status and the metabolic response to short-term anaerobic exercise In plain terms, the mineral water changed what the urine looked like, but it did not make a measurable difference in how hydrated anyone actually was. For everyday hydration, the mineral content in Waiakea is unlikely to give you anything your body cannot already get from a glass of tap water and a normal diet.
Where mineral water’s electrolyte content does matter is for people on very restricted diets or those who drink almost nothing but water. Research comparing North American tap and bottled waters found that some high-mineralization bottled waters contained up to half the maximum recommended daily intake of sodium, plus meaningful amounts of calcium and magnesium.10PubMed Central. Comparison of the mineral content of tap water and bottled waters Waiakea’s sodium levels are low enough not to be a cardiovascular concern, but this also means the electrolyte contribution is minimal. If you are sweating heavily or need electrolyte replacement, a few bottles of Waiakea will not substitute for a properly formulated rehydration solution.
Mineral Water and Kidney Stones
One concern people have about mineral-rich water is whether it increases kidney stone risk. The answer is more nuanced than you might expect, and largely reassuring.
A large UK Biobank cohort study found that higher magnesium levels in drinking water were actually protective against kidney stones, reducing risk by roughly 10 to 28 percent depending on the subgroup. Hard water and higher calcium concentrations did increase stone risk by 18 to 34 percent, but only in women and adults over 60. Magnesium’s protective effect was actually strongest in harder, more mineral-rich water, suggesting the two minerals interact in ways that partly offset calcium’s contribution to stones.11PubMed. The association between domestic water hardness and kidney stone disease: a prospective cohort study from the UK Biobank
Clinical research supports this. A trial comparing mineral water rich in calcium and magnesium to regular tap water found that the mineral water favorably altered several stone-forming risk factors, including oxalate excretion and the supersaturation levels of calcium oxalate. The mineral water also produced unique improvements in citrate and magnesium excretion that the tap water did not match.12PubMed. Effect of mineral water containing calcium and magnesium on calcium oxalate urolithiasis risk factors The researchers went so far as to suggest that calcium-and-magnesium-rich mineral water deserves consideration as a preventive or therapeutic option for calcium oxalate kidney stones.
For Waiakea specifically, the mineral levels are low enough that kidney stone risk is essentially a non-issue. The concentrations of calcium and magnesium in volcanic Hawaiian water are well below the levels that showed either risk or benefit in these studies. You are not going to form kidney stones from drinking Waiakea, but you are also not going to get the stone-prevention benefits seen with the more heavily mineralized European waters used in trials.
The Plastic Bottle Problem
Waiakea ships in PET (polyethylene terephthalate) plastic bottles, which the company claims are made from 100% recycled material. The recycled sourcing is a legitimate environmental selling point, but the bottles themselves carry the same concerns as any PET container.
PET bottles leach antimony, a metalloid used as a catalyst in plastic production. Under normal room-temperature storage, the amounts are negligible. But research has shown that heating PET bottles to 50°C (about the temperature of a car dashboard on a warm day) increased antimony concentrations dramatically in just 24 hours, rising well above the U.S. EPA’s maximum contaminant level.13PubMed Central. The effect of temperature and storage time on the migration of antimony from polyethylene terephthalate (PET) into commercial bottled water in Kuwait UV exposure from sunlight accelerates this further, causing PET degradation, discoloration, and additional antimony migration that can approach safety limits in a short time.14College of Basic Education Research Journal. Effect of Sun Light on Plastic Water Container Made from Polyethylene Terephthalate Freezing, on the other hand, did not cause significant antimony migration.
The recycling process itself introduces another concern: microplastics. Facilities that process post-consumer PET bottles into reusable flakes produce wastewater containing significant concentrations of microplastic particles.15PubMed. Ignored microplastic sources from plastic bottle recycling Whether these particles end up in the finished bottles is a separate question, but the broader issue of microplastics in bottled water has been well documented across brands. This is not a Waiakea-specific problem; it is a plastic-bottle problem. If you are drinking any bottled water regularly, you are consuming more microplastics than you would from a glass filled at your kitchen tap.
The practical takeaway: keep your Waiakea (or any PET-bottled water) out of hot cars and direct sunlight. If you are buying premium water partly for health reasons, the irony of the plastic packaging undermining some of those benefits is worth acknowledging.
What Your Teeth Get Out of It
One lesser-known angle on alkaline water involves dental health. Acidic beverages like soda, citrus juice, and wine cause enamel erosion over time by dissolving the mineral surface of teeth. Researchers have explored whether alkaline ionized water can counteract some of that damage. A review outlined the mechanism by which acidic drinks erode enamel and described alkaline ionized water as a potential remedy, arguing that since eliminating acidic beverages entirely is unrealistic, alkaline water may help buffer the acidic environment in the mouth after drinking them.16PubMed Central. The Onset of Dental Erosion Caused by Food and Drinks and the Preventive Effect of Alkaline Ionized Water
This is plausible chemistry. Rinsing with a higher-pH liquid after consuming something acidic could help neutralize the mouth’s environment faster, potentially reducing the window during which enamel softens and erodes. Whether Waiakea’s mild alkalinity is enough to make a practical difference in your mouth, as opposed to the more strongly alkaline ionized water used in research, is an open question. Swishing regular water after an acidic drink already helps. Whether volcanic water does it measurably better has not been tested.
How Labels Shape What You Think You Are Tasting
Part of Waiakea’s appeal is undeniably its branding. The volcanic origin story, the Hawaiian imagery, the sustainability narrative, and the sleek label design all contribute to a perception of premium healthfulness. Research on bottled water labeling suggests this perception effect is real and powerful. A study using sensory testing found that consumers’ preferences, purchase intentions, and perceptions of healthiness varied significantly based on label design elements alone, even when the water inside was identical.17PubMed Central. Effect of label elements in bottled water: Impact on consumer preferences, purchase intentions and health perception through affective sensory tests Labels featuring certain color schemes and nutritional information layouts scored higher on perceived healthiness regardless of the actual mineral content.
This does not mean Waiakea is dishonest. The water does come from a volcanic aquifer, it does contain silica and minerals, and it is genuinely alkaline without artificial processing. But the gap between what the product delivers and what the branding implies is wider than most buyers realize. When a bottle of water costs several times what tap water does, you are paying primarily for sourcing, packaging, and story. The minerals are a real but small bonus. The health transformation the branding gestures toward is not supported by the evidence at anything close to the level the marketing suggests.
When Tap Water Is the Better Choice
A broad analysis of bottled mineral waters in South Africa found that while some brands had individual heavy metals exceeding WHO guidelines, the overall health risk from consumption was statistically negligible, with hazard indices and cancer risk estimates well within permissible limits.18Applied Water Science. Health risk assessment of heavy metals and physicochemical parameters in natural mineral bottled drinking water using ICP-MS in South Africa Bottled water, including Waiakea, is generally safe. But “safe” is a low bar, one that municipal tap water in most developed countries also clears, often under stricter and more frequent testing regimes than bottled water faces.
In the United States, tap water is regulated by the EPA under the Safe Drinking Water Act, with enforceable limits on over 90 contaminants and mandatory public reporting. Bottled water is regulated by the FDA, which generally adopts the same limits but with less frequent testing and no public reporting requirement. If you live in an area with clean municipal water, the health case for switching to Waiakea is weak. If your tap water has known issues (lead pipes, agricultural runoff, PFAS contamination), then any clean bottled water is a reasonable alternative, though Waiakea is not doing anything for you that a cheaper brand would not also accomplish.
The one genuinely distinguishing factor is the silica. Most tap water systems and standard bottled waters contain little dissolved silicon. If the emerging research on silica and bone health or aluminum excretion holds up over the coming years, volcanic-sourced waters could eventually have a specific niche beyond marketing. For now, though, the honest answer is that Waiakea is a perfectly fine water that costs more than it needs to, with real but overstated health credentials and a silica content that is its most scientifically interesting feature.