September 15, 2026
Tequila buyers who claim Costco falsely labeled Kirkland Signature-brand tequila told a Washington federal judge on Tuesday that a Mexico-based council's certification of the bottles as "100% agave" isn't enough to extinguish their deceptive marketing case against the U.S. retailer.
April 22, 2026
Costco has urged a Washington federal judge to dismiss a lawsuit accusing the retailer of falsely labeling its Kirkland Signature tequila as made from pure agave, arguing that a U.S. court exercising jurisdiction over the case would interfere with Mexico's "exclusive sovereign authority to determine what is and is not 100% agave tequila."
November 14, 2025
A group of consumers accused Costco of falsely marketing its Kirkland Signature tequila as pure agave when, in fact, its tequila products feature a "significant presence" of non-agave sugars, according to a proposed class action filed Friday in Washington federal court.