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Northwest Pipe Company is a leading manufacturer of welded steel pipe and tube products. The Water Transmission Group is the largest manufacturer of engineered steel pipe water systems in North America. With eight Water Transmission manufacturing facilities, including two Permalok facilities, the Group is positioned to meet North America's growing needs for water and wastewater infrastructure. The Water Transmission Group supplies large-diameter, high pressure pipes, manufactured through a double-submerged arc weld process, in diameters ranging from 18-inches to 156-inches. Projects are engineered to customer requirements and include a wide variety of internal pipe linings, external coatings, and custom fabricated fittings. Two of the Water Transmission facilities manufacture the proprietary Permalok interlocking pipe joining system that takes the field butt welding out of joining steel casing pipe. The Tubular Products Group operates a state of the art Longitudinal ERW mill with diameters ranging from 4.5-inches through 16-inches The Tubular Products portfolio serves a wide-range of markets and its quality certified pipe and tube products are good for applications including: oil and gas, structural, industrial, fire protection and low pressure.

The Company is headquartered in Vancouver, Washington and has manufacturing facilities in the United States and Mexico.