What Is Sparkling Water? | The Fizzy Facts

That’s the entire core of it—plain sparkling water is just water with dissolved CO2, making it fizzy. The carbonation can come from natural underground springs or be injected artificially under pressure. While the term “sparkling water” is often used as a broad umbrella, it technically covers a few different drinks, and what’s inside the bottle changes everything about its nutrition.

What Exactly Is Carbonated Water?

Carbonated water is water that has carbon dioxide gas dissolved into it. This gas creates the bubbles and gives the drink a slight sharpness on your tongue. The mild tang comes from a small amount of carbonic acid that forms when CO2 mixes with water, giving it a flavor that’s distinctly different from flat water.

The carbonation itself is simple. It happens two ways:

• Naturally: Volcanic or geological gases dissolve into underground water sources, creating naturally sparkling water.
• Artificially: CO2 is injected into still water under pressure—this is how most commercial seltzers and club sodas are made.

The bubbles are the only real difference between it and still water. That makes it a genuinely smart swap for sugary sodas when you want something fizzy without the sugar crash.

Sparkling Water vs. Seltzer vs. Club Soda

The terms get tossed around interchangeably, but they’re not always the same product. Cleveland Clinic notes that seltzer is artificially carbonated water, sometimes with added flavors or sugar. Club soda takes it a step further, adding salts and minerals to enhance the taste.

True sparkling mineral water comes from natural springs and brings minerals like calcium, magnesium, and sodium along with it. Plain artificially carbonated water has none unless they’re added back in. Here’s the quick breakdown:

The label matters more than the name. “Sparkling water” doesn’t automatically mean plain water plus bubbles—flavored and sweetened versions can carry added sugar, sodium, or acids that change the health picture entirely.

Is Sparkling Water Actually Healthy?

Plain sparkling water hydrates just like still water. Geisinger Health confirms it’s a healthy choice, especially as a substitute for sugary beverages. For anyone watching calories or sugar intake, swapping a daily soda for sparkling water cuts real calories without losing the fizz most people crave.

There are a couple of things worth knowing before you drink it all day:

• Dental enamel: The carbonation creates mild acidity from carbonic acid. One medical review notes that frequent, prolonged contact can contribute to enamel erosion concerns—especially with flavored or acidified versions, which are more acidic than plain sparkling water.
• Bloating and gas: Carbonation introduces extra gas into your digestive tract, so some people feel bloated or gassy after drinking it. It’s harmless for most, but if you’re prone to bloating, it’s worth paying attention to how your body responds.
• Read the label: Flavored sparkling waters often contain natural flavors, citric acid, or sodium. Some even sneak in sweeteners. If you want plain water with bubbles, check the ingredient list before buying.

It’s zero-calorie, it replaces sugary drinks, and it counts toward your daily fluid intake. The acidity concern is real but manageable—drinking it with meals and favoring plain over heavily flavored versions keeps the risk minimal.

If you’re ready to stock your fridge with healthier fizz, our tested roundup of the best zero sugar sparkling water options breaks down which brands actually deliver on flavor without the sweeteners.