Kirkland Signature is the private-label brand of Costco Wholesale. Kirkland Signature bottled water products are widely sold through Costco warehouses and online channels, primarily in North America.
Kirkland Signature water is positioned as a value-focused bottled water option, offering large pack sizes and competitive pricing. Depending on the product and region, Kirkland Signature sells spring water and purified water under the same brand name.
Kirkland Signature bottled water is not a single-source water.
The brand includes different water types, most commonly:
The exact source and classification depend on the specific product label and bottling facility. Because Costco partners with multiple bottlers, the water source may change by region.
Always check the bottle label to confirm whether the product is spring water or purified water.
Mineral content varies based on the water type:
Spring water versions:
Retain naturally occurring minerals from the source, with mineral levels varying by spring.
Purified water versions:
Minerals are largely removed during treatment. Some products may include trace mineral adjustment for taste.
Because Kirkland Signature uses multiple suppliers, TDS and mineral profiles are not fixed across all products.
Taste characteristics depend on the specific Kirkland Signature water product:
Consumers may notice taste differences between regions or between different Kirkland Signature water labels.
Kirkland Signature water is commonly sold in:
Glass packaging is uncommon. Availability is primarily limited to Costco warehouses and Costco's online store, with product variations by country.
Is Kirkland Signature water spring water or purified?
It can be either. The brand includes both spring and purified water products, depending on the label.
Does Kirkland Signature water contain minerals?
Spring water versions contain naturally occurring minerals. Purified versions have very low mineral content.
Is Kirkland Signature water still or sparkling?
Kirkland Signature water is sold as still (non-carbonated) water.
Kirkland Signature spans multiple bottled water categories:
Rather than focusing on a single source or mineral profile, the brand emphasizes value, scale, and availability. Consumers interested in water type differences can explore comparisons between spring water and purified water.
Final Note: Kirkland Signature bottled water products may vary significantly by region, bottler, and year. Always rely on the specific bottle label for accurate source, treatment, and mineral information.
This page is informational only and does not provide medical or dietary advice.