The water with a bottle of Perrier begins with the cumulative fallen drops and droplets of rain that flow into the Massif Central mountains.
The spring from which Perrier water is sourced is naturally carbonated, but the water and natural carbon dioxide gas are captured independently. The water is then purified, and during bottling, the carbon dioxide gas is re-added so that the level of carbonation in bottled Perrier matches that of the Vergèze spring.
In 1990, Perrier removed the "naturally sparkling" claim from its bottles under pressure from the FDA.
Since at least 2019, Perrier water is no longer "reinforced with gas from the source" but "with the addition of carbon dioxide". According to the company, this change allows it to considerably reduce its total water consumption and reduce its ecological impact.