Primoris provides construction, engineering, and maintenance services, such as replacing and repairing underground pipelines, upgrading and maintaining industrial plants, designing and building concrete structures, and managing the construction of water and wastewater facilities. It also engineers industrial machinery used in oil refineries, petrochemical plants, and other facilities. The firm primarily operates in the US. Primoris' clients have included Duke Energy, Chevron, Sempra, and Kinder Morgan, as well as public sector entities.