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About Us
Gateway Winnelson is a locally owned plumbing supply distributor proudly serving O’Fallon, St. Charles County, and the greater St. Louis region. We specialize in providing high-quality plumbing products, fixtures, and system solutions to professional contractors, builders, and maintenance teams. Our focus is on dependable service, knowledgeable support, and fast access to the brands and parts our customers trust. Whether you’re working on residential, commercial, or industrial projects, our experienced team is committed to helping you find the right solution, on time and within budget.
Brief History & LocationGateway Winnelson operates as part of the nationwide Winnelson network, a division of WinWholesale, Inc., one of the largest wholesale distributors in the plumbing and HVAC industry. Our O’Fallon branch, located at 201 South Cool Springs Road, O’Fallon, MO, serves as a regional hub for plumbing professionals throughout St. Charles County and surrounding communities. Backed by the buying power and logistics network of WinWholesale, Gateway Winnelson combines national resources with local ownership, allowing us to deliver competitive pricing, reliable inventory, and personalized service that national chains can’t match.