They look identical in the glass, but sparkling water and club soda are produced differently and taste different. Here is how they actually differ.
Club soda is plain water that has been artificially carbonated and dosed with mineral additives — usually sodium bicarbonate, potassium sulfate and/or sodium citrate — to give it body and a faintly salty flavor. It typically carries 50–100 mg of sodium per 12 oz serving, more than most flavored sparkling waters (usually 0 mg).
Sparkling mineral water carries minerals it absorbed naturally from rock. Club soda has minerals added at the factory. The result: club soda tends to taste saltier and rounder, sparkling mineral water tastes more terroir-specific.
Club soda: slightly salty, neutral body, bright fizz. Sparkling mineral water: ranges from clean and crisp (Perrier) to mineral-forward and structured (San Pellegrino, Gerolsteiner).
No. Club soda is artificially carbonated water with added minerals; sparkling water can be natural or artificial and varies widely in mineral content.
Yes — most club sodas add sodium bicarbonate or sodium citrate, so they contain meaningful sodium. Check the label if you are watching intake.
In cocktails, yes — though club soda will taste slightly saltier. For straight drinking, the difference is more noticeable.
