NWPX

Nwpx Infrastructure, Inc.

A maker of large steel pipes and precast concrete for water infrastructure, NWPX Infrastructure builds the engineered pipelines and drainage systems that carry drinking water, wastewater, and hydroelectric flows across North America. It was founded in 1966 in Clackamas, Oregon, as Northwest Pipe & Casing, starting with three pipe mills and two dozen employees, and rebranded as NWPX Infrastructure in 2025. Its Permalok steel casing pipe snaps together with a press-fit joint instead of field welding—an invention that lets crews lay pipe faster and more safely underground.