Alkaline Water: Is It Actually Worth Buying?
Alkaline water is one of the most marketed categories in the bottled water industry — and one of the most misunderstood. Here is what the science actually says, which brands deliver real value, and which are just expensive tap water with a high pH reading.
Natural vs. Artificial Alkalinity
This is the most important distinction in the entire alkaline water category — and most brands hope you never think about it.
Natural Alkalinity
Occurs when water filters through mineral-rich rock formations (volcanic basalt, limestone). The alkalinity comes from dissolved bicarbonates, calcium, and magnesium. This mineral profile has genuine health value. Examples: Icelandic Glacial (pH 8.4), Evian (pH ~7.2–7.5), Flow Spring Water.
Artificial Ionization
Municipal tap water run through an electrolysis machine to split water molecules and artificially elevate the pH. No minerals are added. The high pH provides no documented health benefit beyond what the tap water had to begin with. Examples: Essentia (pH 9.5+), Core Hydration (pH 7.4).
The rule: If the label says "ionized" or "electrolysis" and does not list a natural spring source with a mineral analysis, it is artificially alkaline tap water.
The pH Scale Explained
Best Naturally Alkaline Water Brands
These brands achieve alkaline pH through genuine mineral-rich spring sources.
Icelandic Glacial
Boasting an exceptional natural alkaline pH of 8.4 and a certified carbon-neutral operation, it only falls short due to premium pricing.
/10
Evian
An iconic, naturally filtered French alpine spring water, but heavily penalized for the environmental impact of ocean-freighting heavy cargo globally.
/10
Eternal Water
Naturally alkaline water sourced from domestic springs, packaged in cheap, standard commodity plastics.
/10
Flow Alkaline Spring Water
Packaged in eco-cartons with organic flavor profiles, though lacking the performance advantages of advanced cellular oxygenation.
/10
Alkaline Water Brands to Avoid
These brands market themselves as alkaline but use artificial ionization of municipal tap water.
Our Verdict
Natural alkaline spring water from verified mineral-rich sources is worth choosing over standard purified water — not primarily because of the pH, but because of the mineral profile it carries. Icelandic Glacial, Evian, and Flow Alkaline Spring Water are all solid choices in this category.
Artificially ionized alkaline water (Essentia, Core Hydration) is a marketing story with no functional advantage over filtered tap water — and both carry high microplastic risk. Save your money.
Frequently Asked Questions
What is alkaline water and what does it do?
Alkaline water has a pH above 7 (neutral). Natural alkaline water occurs when water passes through mineral-rich rock formations that increase its pH — typically between 7.5 and 9.5. Claimed benefits include better hydration efficiency, acid reflux reduction, and antioxidant properties. The scientific evidence for most of these claims is limited to small studies. However, naturally alkaline spring water with a real mineral profile (like Icelandic Glacial at pH 8.4) does provide demonstrable mineral benefit over purified tap water.
What is the best alkaline bottled water?
Icelandic Glacial is the best naturally alkaline bottled water, ranked #3 overall with a 9.0/10 PHI Score. It has a natural pH of 8.4 from its volcanic rock filtration, is certified carbon-neutral, and uses BPA-free rPET packaging. Evian (#4, 8.5/10) and Flow Alkaline Spring Water (#18, 5.4/10) are other naturally alkaline options. Avoid Essentia and Core Hydration — they are artificially ionized tap water with poor scores.
Is alkaline water actually better than regular water?
It depends on the source of the alkalinity. Naturally alkaline spring water contains a mineral profile (bicarbonates, calcium, magnesium) that provides real health value beyond the pH number. Artificially ionized alkaline water achieves its elevated pH through electrolysis, adding no minerals — making it nutritionally equivalent to filtered tap water at a premium price. Our recommendation: choose naturally alkaline spring water from verified sources and avoid artificially ionized brands.
Is Essentia alkaline water good?
Essentia is ranked #42 of 50 with a 2.3/10 score on our index and is classified as Tier 4 (Avoid). It is a processed municipal tap water that achieves its 9.5 pH through an ionization machine — not from natural mineral content. This means the alkalinity provides no mineral benefit. It also carries a High Microplastic Risk badge from its standard PET packaging. The premium price is not justified by the product quality.
What pH should bottled water be?
The WHO guidelines for safe drinking water consider pH 6.5–8.5 as the acceptable range. For optimal wellness benefits, naturally alkaline water in the 7.5–8.5 range is ideal. Extremely high pH water (above 9.5) from artificial ionization offers no proven additional benefit. The most important factor is not the pH number alone, but whether the alkalinity comes from a natural mineral profile or artificial manipulation.