Post Point Wastewater Treatment
Post Point Wastewater Treatment Plant Improvements / BellinghamWA
What does it take to treat 60 million gallons of wastewater per day?
The $47 million improvements to the Post Point Wastewater Treatment Plant involved expanding the core secondary process and increasing the plant’s Biological Oxygen Demand (BOD) treatment capacity. This project included modifications to existing primary effluent and Return Activated Sludge (RAS) pump stations and flow splitting structures, a new anaerobic selector basin, additional activated sludge basins and associated mechanical facilities, a fourth secondary clarifier, a new blower building to provide oxygen to the biological process, retrofits to the existing activated sludge basins for conversion to air, and modifications and improvements to existing electrical and control systems. The project required keeping the existing primary treatment facility in operation during construction. The Post Point team constructed temporary bypasses to divert the plant’s influent and effluent while the new facilities were being built. This facility has an average annual flow of 18 million gallons per day and a peak hour flow of 72 million gallons per day.

Facts And Figures

City of Bellingham


72 million gallons per day

Delivery Methods

Construction Manager
General Contractor

The Team