Sterling Pump Station FAQs

What is the Sterling Pump Station?

The Sterling Pump Station is a component of Western’s La Sierra Pipeline project, a five-mile underground pipeline built along La Sierra Avenue and one of multiple projects to secure the region’s local water supply. The pump station provides the technology to propel water uphill at various points along the new pipeline, providing a secure, local, and reliable water source for Western Water's customers.

Why did Western Water build the Sterling Pump Station?

Western Water provides almost 28 billion gallons of water annually to customers in Riverside County, but 55% of it is imported from Northern California, which is less reliable and travels further from source to tap. To keep rates under control and establish reliability, Western Water actively works on innovative infrastructure projects to secure a locally sourced water supply. Three projects, the expanded Chino and Arlington Desalters, the La Sierra Pipeline, and the Sterling Pump Station work together to deliver new local and reliable water supply to Western Water's service area. 

The expanded Chino and Arlington desalters extract local groundwater and purify it through reverse osmosis to create clean drinking water. The new Sterling Pump Station uses technology to pump water from the desalters uphill through the La Sierra Pipeline, a five-mile, 30-inch underground pipeline built along La Sierra Avenue. Since its completion in 2021, the pipeline carries water to the La Sierra Reservoir and then delivers it to Western Water customers. The infographic below shows how these projects will work together to secure, transport, and provide local, reliable water to the region. 

This infographic (below) highlights how the various projects Western is undertaking will work together to secure, transport, and provide local, reliable water to the region.

Sterling_Pump_Infographic FINAL

Where is it  built?

The project site is at the end of Sterling Avenue in the Riverside Business Park, in between Riverside Indoor Shooting Range and the Santa Ana Watershed Project Authority.


How much did the project cost?  Sterling Pump Station construction cost $16 million.

How is this project being funded?  The Sterling Pump station and La Sierra Pipeline project are not expected to increase the rates charged to customers. The Project will provide high-quality source of water that is locally developed rather than imported, thereby increasing the District’s water supply reliably to our customers. The project is funded by a Federal Bureau of Reclamation Grant and by Western Water's Water Reliability Fund, which was earmarked in Western Water's existing rate schedule. Financing is provided by the State of California’s Revolving Fund Loan program.

Who can I contact if I have questions? 

Please contact the Strategic Communications Department at