For most people, the sodium in sparkling water is not something to worry about. The majority of popular brands contain so little sodium per serving that it barely registers against your daily intake. A few naturally mineral-rich options carry significantly more, but even those don’t appear to raise blood pressure the way table salt does.
How Much Sodium Is Actually in Sparkling Water
The amount varies enormously depending on what you’re drinking. San Pellegrino and Topo Chico contain roughly 40 milligrams of sodium per liter, which works out to about 10 mg in a typical glass. La Croix contains none at all. Plain seltzer, the most basic form of carbonated water, generally has no added minerals of any kind.
Then there are outliers. Vichy Catalan, Spain’s most popular sparkling water, packs 1,097 milligrams of sodium per liter. That’s nearly half the American Heart Association’s ideal daily limit of 1,500 mg in a single bottle. Most people will never encounter Vichy Catalan at their grocery store, but it illustrates how wide the range can be.
The AHA recommends no more than 2,300 mg of sodium per day, with 1,500 mg as the optimal target for most adults. At 40 mg per liter, you could drink several bottles of San Pellegrino and still take in less sodium than a single slice of deli meat. The sodium in most sparkling water is, nutritionally speaking, a rounding error.
Not All Carbonated Water Is the Same
The label “sparkling water” gets applied to several different beverages, and their sodium profiles differ. True sparkling mineral water comes from a natural spring or well and contains whatever minerals (calcium, magnesium, sodium) happen to be in the source. The mineral content varies by geography. Seltzer is just plain water with carbon dioxide injected into it. It typically contains no sodium at all unless a brand adds it.
Club soda is the one to watch if sodium matters to you. It’s carbonated water that’s been deliberately infused with minerals like sodium chloride (table salt) and sodium bicarbonate (baking soda). A can of club soda can contain 50 to 75 mg of sodium, sometimes more. That’s still modest compared to most foods, but if you’re mixing several cocktails with club soda in an evening, it adds up faster than seltzer would.
Tonic water is a different category entirely. It contains added sugar or sweeteners along with quinine, and its sodium content is the least of its nutritional concerns.
Sodium Bicarbonate vs. Table Salt
Here’s the detail most people miss: the type of sodium in sparkling mineral water is often sodium bicarbonate, not sodium chloride. Your body handles these differently. A 2016 study found that a sodium-rich mineral water actually reduced several markers of cardiovascular risk and did not increase blood pressure in healthy adults. A later study by Mansouri and colleagues in 2023 compared people drinking mineral water high in both bicarbonate and sodium against people drinking low-sodium water. Their finding: the high-sodium mineral water did not appear to have adverse effects on blood pressure. Statistical analysis showed no association between the sodium excreted in urine and any increase in systolic blood pressure in the high-sodium group.
This doesn’t mean sodium in sparkling water is completely harmless for everyone. A 2024 systematic review published in Current Nutrition Reports noted that whether people with existing hypertension should avoid sparkling water remains an open question. The research so far is reassuring for healthy adults, but the evidence base for people already managing high blood pressure is still thin.
Reading Labels Correctly
U.S. labeling rules set specific thresholds for sodium claims on packaged beverages. A product labeled “sodium-free” must contain less than 5 mg per serving. “Very low sodium” means 35 mg or less. “Low sodium” means 140 mg or less. If your sparkling water has a nutrition label (and most bottled varieties do), these categories tell you at a glance where it falls.
Some European mineral waters don’t follow the same labeling conventions, so checking the actual milligram count on the nutrition panel is more reliable than trusting front-of-bottle marketing. If the brand lists sodium per liter rather than per serving, divide by roughly four to estimate the amount in a standard 8-ounce glass.
When It Could Actually Matter
If you’re on a sodium-restricted diet, typically because of heart failure, kidney disease, or resistant hypertension, every source of sodium counts. In that context, choosing a zero-sodium seltzer over a mineral water with 40 mg per liter is an easy, painless swap. The difference is small on paper, but people on strict limits are often told to stay under 1,500 mg daily, and those small amounts from beverages, condiments, and “hidden” sources collectively make the difference between hitting your target and exceeding it.
For everyone else, sparkling water is one of the lowest-sodium beverages you can choose. A single tablespoon of soy sauce contains over 800 mg of sodium. A bowl of canned soup often exceeds 700 mg. Even a slice of bread can have 100 to 200 mg. Compared to virtually anything else in a typical diet, sparkling water contributes almost nothing to your sodium total. If you enjoy it and it helps you drink more water overall, the tradeoff is overwhelmingly in your favor.