Understanding Bicarbonate Mineral Water: What It Is and Why It Matters
When you look at the mineral analysis panel on a bottle of natural mineral water, bicarbonate is often the number that stands out. In many premium waters, it's the dominant mineral by concentration. But what exactly is bicarbonate, where does it come from, and why should you care?
Here's everything you need to know about bicarbonate in mineral water.
What Is Bicarbonate?
Bicarbonate (HCO3-) is a naturally occurring ion found in water that has passed through carbonate-rich rock formations such as limestone, dolomite, and basalt. As water slowly percolates through the earth, it absorbs carbon dioxide from surrounding geology, and bicarbonate is one of the primary compounds that results.
In natural mineral water, bicarbonate is a marker of geological depth and filtration time. Waters with high bicarbonate levels have typically spent a long time underground, in contact with mineral-rich rock. It is one of the clearest indicators that a water is genuinely natural and unprocessed.
What Does Bicarbonate Taste Like?
Bicarbonate contributes a subtle, pleasant alkaline quality to water. It softens the overall taste, rounds out any harshness from other minerals, and gives the water a smooth, clean finish. Many people describe high-bicarbonate waters as feeling particularly refreshing and easy to drink.
It is also what gives some mineral waters a very slight effervescent quality even before carbonation, a gentle liveliness on the palate that distinguishes them from flat, neutral waters.
The Health Dimension
Bicarbonate has a well-established role in human physiology. It is the body's primary buffering system, helping to regulate blood pH and maintain acid-base balance. When you consume bicarbonate through mineral water, you are supporting this natural buffering function.
Research has suggested that bicarbonate-rich mineral water may assist with:
Digestive comfort - Bicarbonate can help neutralise excess stomach acid, making high-bicarbonate waters a traditional choice for those with digestive sensitivity or reflux.
Post-exercise recovery - During intense exercise, lactic acid builds up in muscles, contributing to fatigue and soreness. Bicarbonate helps buffer this acidity, and some studies suggest that drinking bicarbonate-rich water during or after exercise may support faster recovery.
Bone health - Some research indicates that alkaline, bicarbonate-rich waters may help reduce urinary calcium loss, which has implications for long-term bone density.
It is worth noting that while these associations are supported by research, mineral water is not a medicine. The benefits are best understood as part of a balanced diet and healthy lifestyle.
Bicarbonate vs Alkaline Water: What's the Difference?
This is a common point of confusion. Alkaline water has become a marketing category of its own, often referring to water that has been artificially ionised or had alkaline minerals added to raise its pH. These products are manufactured, not natural.
Bicarbonate mineral water, by contrast, is naturally alkaline as a result of its mineral content. The alkalinity is a genuine expression of the water's geology, not a manufacturing process. If you are seeking the benefits associated with alkaline water, naturally high-bicarbonate mineral water is the authentic version.
How to Read a Mineral Water Label
When evaluating a mineral water for bicarbonate content, look for the mineral analysis table on the label or the brand's website. Bicarbonate is typically listed in milligrams per litre (mg/L). As a general guide:
- Below 200 mg/L: low bicarbonate
- 200 to 600 mg/L: moderate bicarbonate
- Above 600 mg/L: high bicarbonate
One Tree and Bicarbonate
One Tree Mineral Water is sourced from a confined artesian aquifer beneath the Macedon Ranges in Victoria, where water has been slowly filtering through ancient rock for thousands of years. This extended underground journey is reflected in our water's naturally occurring bicarbonate content, part of a balanced mineral profile that has been recognised at the highest levels of international fine water judging.
Our water is never reverse osmosis treated and never artificially remineralised. The bicarbonate you find in One Tree is exactly what nature put there, nothing more and nothing less.
To learn more about what makes natural mineral water different from spring and artesian water, read our guide: Spring Water, Artesian Water, Natural Mineral Water: What's the Difference?
