How to Read a Bottled Water Mineral Analysis

Read the identity before the numbers

A mineral analysis is easier to use after you confirm what kind of water you are viewing. In the United States, terms such as mineral water, spring water, purified water, and sparkling bottled water have specific regulatory meanings. Under 21 CFR 165.110, water labeled “mineral water” comes from a protected underground source, has at least 250 parts per million of total dissolved solids, and receives no added minerals. Spring water is defined by where it originates and how it is collected.

Those identities do not rank waters from best to worst. They tell you what the product is. “Premium,” “fine,” and “specialty” may describe positioning, but they do not replace the regulated statement of identity. Start there, then note whether the water is still or sparkling.

Check the units and the document date

Most consumer-facing water analyses list components in milligrams per liter, abbreviated mg/L. FineWaters notes that TDS is also commonly expressed as parts per million for water. Keep the units consistent when comparing two tables, and do not compare a number in mg/L with one in another unit as if they were identical.

Look for the date or reporting period. A current manufacturer page or quality report is more useful than an undated chart copied by a retailer. Record the document date with your notes so you can distinguish a current analysis from a historical figure, even when your buying decision does not depend on a single number.

Understand TDS without treating it as a score

Total dissolved solids, or TDS, summarizes dissolved material rather than naming each component. It is useful for placing waters on a broad minerality spectrum. In tasting terms, a higher total can signal a more pronounced mineral character, while a lower total can feel lighter—but composition matters, and preference is personal.

TDS is not a universal measure of purity, safety, or value. A higher number is not automatically better. It also does not tell you which minerals make up the total. Use the TDS glossary for the short definition, then read the individual entries.

Scan the main minerals and ions

A typical analysis may include calcium, magnesium, sodium, potassium, bicarbonate, sulfate, and chloride. Gerolsteiner’s ingredient guide lists these among the substances commonly found in natural mineral water. Their relative amounts help distinguish one profile from another.

For buying and tasting, use the table as a comparison tool:

• Calcium and magnesium: often discussed together when describing hardness and mineral structure.
• Sodium: worth checking when a stronger savory or salty impression matters to you, or when a clinician has given you a sodium limit. Do not turn the label into medical advice.
• Bicarbonate, sulfate, and chloride: major negative ions that help explain why equal TDS totals need not taste alike.
• Potassium and silica: sometimes listed at smaller amounts and useful for completing the profile.

Do not add every displayed number and expect it to equal TDS. The table may use different analytical conventions, may omit minor constituents, and can include related measures that are not separate ingredients. Compare like with like across current manufacturer analyses.

Treat pH and conductivity as supporting details

pH describes acidity or alkalinity at the stated testing conditions. It does not tell you that one bottled water is broadly healthier than another. Conductivity indicates how readily water conducts electricity and is related to dissolved ions, but it is not a substitute for the complete mineral table. These figures can help characterize a water; they should not become standalone buying claims.

Use a five-line comparison

When two bottles interest you, record: product identity, still or sparkling, TDS, the largest listed mineral components, and bottle format. Then taste them under the same conditions. The fine water guide adds source and carbonation context, while the World of Water collection lets you compare current listings.

The best analysis is the one that helps you form a specific expectation and then check it against your own taste. It should narrow a choice, not manufacture certainty the numbers cannot provide.