Fiji Water has a pH of 7.8, which makes it mildly alkaline. Anything above 7.0 on the pH scale is considered alkaline (or basic), while anything below 7.0 is acidic. At 7.8, Fiji Water sits slightly above neutral, putting it in the same general range as many natural mineral waters but noticeably higher than some popular competitors.
What Makes Fiji Water Alkaline
Fiji Water’s mild alkalinity comes from where it originates: an artesian aquifer on Viti Levu, Fiji’s largest island. Rainfall filters slowly through layers of volcanic rock before collecting deep underground. As water passes through these rock formations over time, it picks up naturally occurring minerals, including silica, calcium, magnesium, and bicarbonate. These dissolved minerals, particularly bicarbonate, are what push the pH above neutral.
This is different from brands that start with purified or distilled water and then add minerals or use electrolysis to raise pH artificially. Fiji Water’s alkalinity is a byproduct of its geological source, not a manufacturing step.
How Fiji Compares to Other Bottled Waters
A pH of 7.8 is alkaline, but it’s not dramatically so. To put it in context:
- Evian Natural Spring Water: pH of about 6.98, essentially neutral and slightly on the acidic side
- SmartWater: pH of roughly 7.48, just above neutral
- SmartWater Alkaline: pH around 10.22, heavily alkaline by design
Fiji Water falls in a middle ground. It’s more alkaline than standard spring and purified waters but far less alkaline than brands specifically marketed as “alkaline water,” which typically target a pH of 8.5 to 10 or higher. If you’re looking for a naturally alkaline option without the extreme pH of engineered alkaline waters, Fiji fits that niche.
Does Alkaline Water Actually Do Anything
Your body tightly regulates its own pH through your kidneys, lungs, and blood buffer systems. Drinking mildly alkaline water like Fiji won’t shift your blood pH, which stays locked between 7.35 and 7.45 regardless of what you drink. The idea that alkaline water “balances your body’s pH” is largely a marketing claim that oversimplifies how the body works.
That said, there is one area where alkaline water shows a more specific benefit. A study published in the Annals of Otology, Rhinology & Laryngology found that water with a pH of 8.8 permanently deactivated pepsin, the enzyme responsible for the burning damage in acid reflux. The researchers also found that high-pH water had a stronger acid-buffering capacity than conventional water. Fiji Water at 7.8 doesn’t quite reach that 8.8 threshold, so it wouldn’t have the same effect, but it’s closer than most tap or bottled waters.
For general hydration, the pH of your water matters far less than simply drinking enough of it. The mineral content in Fiji Water (silica, calcium, magnesium) contributes small amounts of those nutrients, but not enough to replace dietary sources or compete with a dedicated electrolyte drink during intense exercise.
pH Can Shift After Bottling
One thing worth knowing: the pH printed on a label or quality report doesn’t always match what’s in the bottle by the time you drink it. A study comparing popular bottled waters found that the majority tested more acidic in the lab than the values listed in their water quality reports. Exposure to air when you open the bottle, the plastic packaging itself, and storage time can all nudge pH downward slightly.
This doesn’t mean Fiji Water becomes acidic, but a bottle that’s been sitting on a shelf for months may test a bit below 7.8. The shift is small and has no meaningful health impact, but it’s a useful reminder that pH values for any bottled water are approximate rather than guaranteed at the moment of drinking.
The Bottom Line on Fiji’s pH
Fiji Water is alkaline at a pH of 7.8, naturally so because of the volcanic rock filtration in its aquifer source. It’s more alkaline than most standard bottled waters but well below the heavily engineered alkaline brands. If you prefer a naturally sourced water that leans slightly alkaline, Fiji delivers that. If you’re looking for the high-pH water studied for acid reflux benefits, you’d need a brand closer to pH 8.8 or above.