Sodium in Mineral Water: Read mg/L and Calculate a Stated Volume

Find sodium itself, then read its unit

Look for the row or label entry named sodium, and keep the amount with its unit and basis. A value in mg/L is a concentration. It is not automatically the milligrams in a bottle, per serving or per day. Multiply by the relevant volume only after the basis is clear.

A source-category word such as mineral, spring or purified cannot supply the missing sodium amount. FDA’s US mineral-water description concerns underground origin and total dissolved solids, not one universal sodium concentration. The bottled-water guide explains that category distinction.

This page performs document reading and arithmetic. It does not set a sodium allowance, recommend a brand, interpret a medical restriction or measure a bottle in your possession.

Source: [2]

A real report distinguishes the sodium result from its reporting limit

The complete annual PDF linked by evian’s US report page contains two identified NSF test reports. On PDF page 4, sample S-0002187285, job A-00504667, has a sodium result of 7.1 mg/L and a reporting limit of 0.2 mg/L. Sodium has a numeric result; it is not ND in this row.

PDF page 17, sample S-0002187307 for Sparkling Spring Water — Line R in the second report, also records sodium as 7.1 mg/L with a 0.2 mg/L reporting limit. Keep the sample identities separate even where the reported value agrees. Agreement between those two samples is not proof of an exact concentration in every subsequent bottle.

The reporting limit describes the laboratory’s reporting boundary. Do not use 0.2 mg/L as the sodium result, subtract it from 7.1 or call it measurement uncertainty. The ND guide explains that field’s different role.

The download is linked as a 2025 report, the cover is dated 16 March 2026 and the laboratory reports were authorized on 20 February 2025. Accessing the file later does not create a new analysis or sampling date. These are historical report observations, not a current package survey.

Source: [1]

Convert the volume before multiplying

Amount in milligrams = concentration in mg/L × volume in litres. For a volume written in mL, divide by 1,000 first. For example, 500 mL = 0.500 L and 750 mL = 0.750 L.

Scroll sideways inside the table to read every column.

These products show mathematical relationships. They are not laboratory measurements of those particular bottle sizes and not suggested drinking volumes. Multiplication may produce more decimal places than the source result; it does not make the source measurement more precise. Retain the original 7.1 mg/L and describe the calculated amount as an estimate when applying it to a real volume.

If a nutrient label already states mg per serving, use its stated serving size rather than multiply the number as if it were mg/L. If it states mg per 100 mL, the factor for a 500 mL volume is five. A missing or unclear basis is a question to resolve, not permission to choose the convenient one.

Source: [1]

Compare concentration and total amount separately

The following values are invented to show a common comparison mistake. Fictional Water A has 8 mg/L sodium in a 250 mL volume; fictional Water B has 4 mg/L in a 1 L volume. A has the higher concentration, but its stated volume corresponds to 2 mg while B’s corresponds to 4 mg.

Neither statement conflicts: one compares concentration and the other compares different volumes. To compare the waters on an equal-volume basis, choose the same stated volume for both. At 500 mL, the same fictional values correspond to 4 mg for A and 2 mg for B.

Do not turn the smaller total in a smaller bottle into “lower sodium concentration.” Likewise, a per-serving comparison is unresolved when the serving sizes differ and are not recorded. Write which basis you are using.

Flavoured or electrolyte products can have added ingredients and a different label basis. Use the actual product label. The site’s separate electrolyte serving calculator is for its stated nutrient inputs; it does not prove that a plain-water laboratory result describes another beverage.

A blank cell or missing label does not prove zero sodium

The evian laboratory notes explain that a blank FDA SOQ column means no FDA maximum has been established for that contaminant in the report’s framework. On the sodium row, that standard column is separate from the numeric Result field. Its blank does not erase 7.1 mg/L.

If sodium is absent from the pages you have, ask for the relevant mineral analysis, nutrient information or report explanation. Do not infer zero from “natural,” “purified,” taste, total dissolved solids or a missing row. If a report uses ND, retain its own definition and reporting limit instead of substituting a zero.

No clinical classification such as suitable for a prescribed low-sodium plan follows from the arithmetic here. A medical instruction may involve other foods, drinks, medications and a prescribed recording basis. Bring the exact product information to the responsible professional rather than derive a new personal limit from this example.

Source: [1]

Use a concentration-to-volume record

PRODUCT AND SOURCE
Exact product / market / original report URL:
Report issue date / sample ID / page:
SODIUM FIELD
Result exactly as written:
Unit and basis: mg/L, per serving or per 100 mL:
Reporting limit or qualifications, kept separately:
VOLUME ARITHMETIC
Stated volume and conversion to litres:
Formula and calculated amount:
Original source precision / estimate or unknown:
COMPARISON
Equal volume or different total volumes, explicitly stated:
Missing field to ask the maker about:

Use the card to answer the narrow question you can verify. If a report’s sample or unit cannot be matched, stop at that gap. The test-report scope guide explains why even a correctly read laboratory document is not, by itself, a certification verdict about every marketed product.

Download the blank record as plain text. Keep missing information blank until the appropriate source supplies it.