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Kirkland Signature Grapefruit, Sparkling Water

Common questions

Is Kirkland Signature Grapefruit, Sparkling Water healthy?

Kirkland Signature Grapefruit, Sparkling Water scores 65/100 on Scout's independent analysis of ingredients, additives, and lab results — a fair-to-good score — solid, with tradeoffs. This sparkling water is ultra-processed due to the inclusion of natural flavors, which contributes to its processing level.

How processed is Kirkland Signature Grapefruit, Sparkling Water?

Kirkland Signature Grapefruit, Sparkling Water is NOVA Group 4: Ultra-Processed Foods.

Which ingredients drive Kirkland Signature Grapefruit, Sparkling Water's score?

In Scout's ingredient-by-ingredient analysis, Natural Flavors is flagged as an ingredient of concern. The full breakdown, with why each one matters, is in the Key ingredients section on this page.

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Kirkland Signature Grapefruit, Sparkling Water

Kirkland Signature
65 Fair

Analysis updated August 2026 · How Scout scores

$14.99 · 24 count · 17 oz · $0.04 / fluid ounce
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Near you

Kirkland Signature is carried at Costco stores. Find one within 25 miles.

At a glance

Beneficial ingredients 0
Harmful ingredients 1
Owned by Costco
Category Bottled Water
Summary

This sparkling water is ultra-processed due to the inclusion of natural flavors, which contributes to its processing level. While it contains no harmful additives or sweeteners, the use of natural flavors instead of pure ingredients results in a lower score. The carbonation process and lack of transparency about the water source also impact the overall rating.

Key ingredients 2

Carbonated Water
Neutral

Carbonated water is primarily water infused with carbon dioxide gas under pressure, making it fizzy. It is generally considered neutral as it does not provide significant nutritional benefits or risks. The carbonation process does not introduce harmful substances, but it may cause mild digestive discomfort in some individuals.

See more about Carbonated Water →
Natural Flavors
Bad

Umbrella term that can hide dozens of undisclosed synthetic constituents.

See more about Natural Flavors →

Processing

Group 4 · Ultra-processed

Ultra-Processed Foods

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