Kirkland Signature Purified Water

Kirkland Signature Purified Water is a private-label product offered by Costco Wholesale. The water is sourced from local municipal supplies and then undergoes a rigorous purification process, including reverse osmosis and carbon filtration, with minerals added back for a consistent taste.

Because the brand utilizes a regional sourcing model to keep shipping costs low, the water is bottled at various third-party facilities across the United States and Canada, often by major beverage companies like Niagra Bottling or Nestlé Waters North America.

As the flagship private label of Costco, Kirkland Signature represents a significant portion of the retailer's sales, offering high-quality essentials at a lower price point than national brands. The brand remains entirely owned and managed by Costco Wholesale Corporation, headquartered in Issaquah, Washington.