Does Drinking Carbonated Water Count as Water

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Here’s a fact that’ll make your dentist cringe but your hydration heart sing: Sparkling water is 99.9% water. The fizz comes from pressurized carbon dioxide gas, which dissolves into carbonic acid—giving it that sharp bite. But that acid is weak, weaker than the stomach acid you already have brewing like a villain in your gut.

A 2018 study found that carbonated water hydrates you just as well as still water. Researchers made people drink both, then checked urine concentration (yes, someone’s job is to measure pee—respect). No difference. Your body doesn’t throw a tantrum over bubbles. It’s like getting the same paycheck whether it’s handed to you in crisp bills or rolled into a wad. Money is money. Water is water.

But What About All the Scary Myths?

Hold up—I hear you shouting, “But won’t the bubbles leach calcium from my bones?!” That myth is older than your grandma’s Tupperware. Studies show no link between carbonated water and bone loss. The real culprit for that is cola, thanks to phosphoric acid, which messes with calcium. Seltzer doesn’t have that stuff. So sip your fizzy water without fear of turning into a human skeleton puppet.

Another urban legend: carbonated water rots your teeth. Not exactly. Plain sparkling water has a pH of about 3.5–5.0, which is slightly acidic, but far less than orange juice (pH 3.3) or soda (pH 2.5). A 2016 study found that plain bubbly water has negligible effects on enamel if you drink it in moderation. Add a lemon slice, though, and you’re basically gargling acid—maybe skip that.

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