Where does Costco get their water from?
A closer look at the purified water from Niagara Bottling — which has the Kirkland Signature label at Costco — starts with a pretty rigorous purification process occurring in several stages. This begins with sourcing the water itself from vetted wells, springs, or municipal water systems. Niagara began producing private label bottled water in the 1990s and has since gone national. Their private label clients include big box retailers, grocery stores, and convenience stores including Walmart, Costco and Meijer.