Construction Management

Lower Northwest Interceptor Pump Stations | West Sacramento, CA

Sacramento Reg'l Sanitation District


Construction Management
Inspection Services


CMAA – Project Achievement Award

New Pump Stations for 20-Mile Forcemain Pipeline

The Natomas area in north Sacramento was experiencing rapid population growth, challenging the Sacramento Regional County Sanitation District (SRCSD) with conveying wastewater to the regional treatment plant. After evaluating several options, SRCSD determined the best alternative was to construct a pipeline from the Natomas area to the treatment center in Elk Grove. The new pipeline was routed from its starting point in Natomas, west under the Sacramento River, through the City of West Sacramento and the County of Yolo, under the Sacramento River again, and finally terminating at the water treatment plant.

Due to the 20-mile distance and elevation changes, a forcemain design was implemented that required two new pump stations ¬– the Natomas and South River Pump Stations ¬– known as the Lower Northwest Interceptor Pump Stations. Psomas provided full construction management and inspection services for the facilities under one contract. The $124 million project included two 1,750 hp variable frequency driven, non-clog centrifugal pumps at each site capable of pumping 200 MGD of wastewater over the 20-mile distance.