What are the differences between naturally and artificially carbonated spring water?

Where do the bubbles come from?

In naturally carbonated water, carbon dioxide (CO2) rises with the water from the underground source. In artificially carbonated water, a bottler dissolves purified CO2 into still water under pressure. The gas is the same molecule either way; what differs is where it came from and how much is in the bottle.

What does the FDA say about the label?

Under the FDA bottled water standard (21 CFR 165.110), water can be called sparkling bottled water only if, after treatment and any CO2 replacement, it contains the same amount of carbon dioxide it had at emergence from the source. The same rule lists carbonated water among the names that are not covered by the bottled water definition, so such products are not held to that source-level CO2 test. The rule text we read does not use the phrase naturally carbonated, so the label wording on a bottle is up to the producer within those limits.

Does it taste different?

Often a little, but we found no official source that ranks one as better. Bubble size and fizz level depend on how much CO2 is dissolved and how cold the bottle is. Mineral content depends on the spring, not on how the bubbles got there. Some brands of mineral water are naturally rich in minerals, others have almost none, so read the mineral analysis on the label instead of assuming.

Is one healthier?

We found no official source that says naturally carbonated water is healthier than water carbonated at the factory. Both are water plus dissolved CO2. Claims that natural bubbles add special minerals or that one type has a lower environmental footprint are not backed by the rules we read, so treat them as marketing unless the label gives numbers.

How to tell what you are buying

Check the ingredient list: plain sparkling water should list water (and sometimes carbon dioxide) only. Flavored versions add flavors, and some add sweeteners or acids.