Carbonated spring water is a perfectly healthy drink for most people. It hydrates just as well as still water, delivers natural minerals your body can use, and poses no meaningful risk to your bones. The main trade-off is a slight acidity that can affect tooth enamel over time, though it’s far less erosive than soda or juice.
It Hydrates the Same as Still Water
One of the most common concerns about sparkling water is whether the carbonation somehow reduces hydration. It doesn’t. A beverage hydration index study at Loughborough University tested 13 common drinks and measured how much urine people produced over four hours compared to still water. Sparkling water performed identically to still water. The drinks that did outperform plain water were oral rehydration solutions and milk, both of which contain electrolytes, protein, or sugar that slow fluid absorption. Carbonation itself has no effect on how well your body retains the water you drink.
Natural Minerals Are a Real Benefit
This is where carbonated spring water stands apart from seltzer or plain sparkling water. Spring water picks up minerals as it moves through underground rock, and those minerals stay in the water after carbonation. A survey of 126 sparkling water brands across Europe found calcium levels ranging from about 44 mg/L to 91 mg/L and magnesium levels from 7 mg/L to 52 mg/L, depending on the source.
Those numbers won’t cover your daily needs on their own (adults need roughly 1,000 mg of calcium and 400 mg of magnesium per day), but they do add up across multiple glasses. If you’re choosing between seltzer, which is just tap water with added CO2, and a mineral-rich spring water, the spring water gives you something extra for free.
Club soda is a third category worth knowing about. It’s artificially carbonated like seltzer but has added sodium bicarbonate or potassium sulfate to mimic a mineral taste. The mineral profile is controlled by the manufacturer rather than coming from a natural source.
The Tooth Enamel Question
Carbonated water is acidic. Carbon dioxide dissolves in water to form carbonic acid, and commercial sparkling waters typically have a pH between 4.18 and 5.87. The threshold where enamel starts to dissolve is around pH 5.5, which means some sparkling waters sit right at or below that line.
That said, the erosion risk depends heavily on the level of carbonation and what else is in the water. A lab study comparing different carbonation levels found that highly carbonated water caused measurably more enamel softening than lightly carbonated water. But when calcium ions were present in the water (as they naturally are in many spring waters), the damage dropped significantly. Low-carbonation water with calcium caused only about a third of the enamel change that high-carbonation water without calcium did.
In practical terms, this means carbonated spring water with its natural calcium content is gentler on your teeth than plain seltzer with the same level of fizz. It’s also far less erosive than soda, fruit juice, or sports drinks, all of which combine acidity with sugar or citric acid. If you’re still concerned, drinking through a straw or rinsing with plain water afterward reduces contact with your teeth.
Effects on Digestion
The fizzy, full feeling you get after drinking sparkling water is real. Carbon dioxide creates gas in your stomach, which temporarily stretches the stomach wall. A study on gastric emptying found that carbonated water didn’t change how quickly food left the stomach overall, but it did change how the meal was distributed inside the stomach. For most people, this means occasional bloating or burping rather than any lasting digestive issue.
Carbonation does interact with hunger hormones in an interesting way. When researchers gave people a carbonated drink before a solid meal, they saw a larger drop in ghrelin (the hormone that signals hunger) compared to a flat version of the same drink. You might expect that to reduce food intake, but it didn’t. People ate the same amount of calories regardless of whether they drank carbonated or still beverages beforehand. So while sparkling water might make you feel slightly fuller for a few minutes, it’s unlikely to meaningfully change how much you eat.
If you have acid reflux or irritable bowel syndrome, carbonation can aggravate symptoms. The extra gas in your stomach increases pressure, which can push stomach acid upward. People with these conditions often do better with still water.
No Evidence of Bone Damage
The idea that carbonated drinks weaken bones comes from research on cola, not sparkling water. Cola contains phosphoric acid, which can shift the calcium-to-phosphorus ratio in your body and reduce bone density over time. Sugar and sodium in soft drinks also increase calcium loss through urine. Carbonated spring water contains neither phosphoric acid nor sugar, so the mechanism that harms bones simply doesn’t apply. No study has linked plain carbonated water to lower bone mineral density or increased fracture risk.
An Unexpected Medical Use
Carbonation triggers a surprisingly complex sensory response in your mouth and throat. The carbonic acid activates pain and touch receptors on your oral tissue, stimulating a major nerve pathway that controls sensation in the face and mouth. This tingling sensation isn’t just pleasant. It can actually help people who have difficulty swallowing.
A meta-analysis found that carbonated water reduced aspiration (food or liquid entering the airway) and increased the duration of the protective pause in breathing that happens during swallowing. In a study of older patients with swallowing disorders, carbonated thickened drinks were both easier to swallow and safer than non-carbonated alternatives. The sensory stimulation appears to sharpen the brain’s coordination of the swallowing reflex.
What About Contaminants?
The FDA tested 197 bottled water samples collected from U.S. retail locations in 2023 and 2024, including spring and mineral waters, for PFAS contamination. Only 10 samples had detectable levels, and none exceeded the EPA’s maximum contaminant levels for drinking water. While no bottled water is guaranteed to be contaminant-free, the testing suggests that the risk from PFAS in bottled spring water is low. If purity is a priority, look for brands that publish independent water quality reports on their websites.