Carollo Engineers, a US-based water engineering consulting company founded in 1933, specialises in the planning, design and construction of water and wastewater facilities. The company has specialised experience in filtration, brine management technologies, and tertiary treatment systems for reuse. They also provide high purity water treatment systems and specialised wastewater treatment plants for clients from the industrial sector, including the semiconductor industry and data centers.

Carollo has completed feasibility (positioning), planning (programming), design/engineering, construction management, and start-up support projects for private clients throughout the US. Carollo Engineers offers a variety of delivery methods for clients, including traditional design-bid-build, Construction Manager at Risk (CMAR), Design-Build (DB/EPC), Design Build-Operate (DBO) and Design-Build-Operate-Finance (DBOF).

The company worked with a semiconductor manufacturer on the construction of an industrial wastewater treatment and recovery plant in Chandler, AZ to meet strict water quality requirements while ensuring that treated reclaimed water was always available. The approach used off-site manufacturing to streamline the schedule, and 3D design and building information modelling (BIM) to allow components from different design and construction parties to be integrated smoothly.