La Sierra Pipeline Project

La Sierra 201609 0053a

La Sierra Pipeline Project Fact Sheet 
La Sierra Pipeline - FAQ

About the Project

Western has been working on an ambitious capital improvement project to provide safe and reliable water for all its customers. The La Sierra Pipeline project is a nearly $36 million project to provide locally-sourced, drought-resistant drinking water to our region.

Since June of 2017, construction crews have been working on La Sierra Avenue to install a 30-inch pipeline that will connect the Arlington and Chino Desalters to the Sterling Pump Station and Reservoir.

What’s next?

Construction of the La Sierra Pipeline is almost complete. The final phase of the project will involve the connection of the La Sierra Pipeline to the Sterling Pump Station and Arlington Desalter located in Riverside, CA. Once connected, these combined facilities will allow water to be pumped and delivered to Western’s Riverside retail service area - providing safe, clean drinking water to approximately 80,000 customers.

The pipeline will also have the capacity to provide an additional 16,000 acre-feet of water, or the equivalent of 16,000 football fields covered in 1-foot deep water, to ensure water flow reliability in the event of an emergency or temporary outage of imported water supplies.

Stay tuned for more project information and details on the upcoming completion celebration in spring 2020.

To sign up for email updates on the La Sierra Pipeline project, click here.

La Sierra Pipeline Public Meeting

Public Meeting Presentation (PowerPoint presented on Mar. 23, 2017)

Check back here for future public meetings.
Contact Info: Lynne Butler, 951.571.7261 or

How It Will Work

An expansion of the Chino Desalter will increase new water production by 3,500 acre-feet per year. Production capacity at the Arlington Desalter will also be expanded thanks to a new 5,400 horse power pump station.

Then, five miles of 30-inch pipe will be placed underground along La Sierra Avenue to connect the two desalter facilities to the La Sierra Tank. This connection will facilitate the delivery of the new water supply to more than 80,000 customers in Western’s Riverside retail service area.


Traffic Impacts

Most of the construction work is now taking place along the Arlington Channel and out of the public right-of-way.

A small construction crew will continue work on La Sierra Avenue to test the pipeline in small sections to ensure it is ready to be put into service.

Some nighttime work will take place in the cul-de-sac of Sterling Avenue in Riverside through mid-May. Work will take place from 6 p.m. to 4 a.m. and measures will be put in place to reduce noise from this work.

Construction Hours

Western is limiting construction hours to avoid noise during early morning and late-night hours. Generally speaking, construction will take place between 7 a.m. and 4 p.m., with some exceptions. Detail construction hours are:

Indiana Ave:
7 a.m. to 3 p.m. on Saturday and Sundays only

La Sierra Pipeline in the News
Efforts to increase local water supply should be embraced 

Project Funding

The La Sierra Pipeline project is 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 from Northern California, 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’s Water Reliability Fund, which is earmarked in Western’s existing rate schedule. Financing is provided by the State of CA’s Revolving Fund Loan program.

Lynne Butler

More Information

Lynne Butler, Community Affairs Representative II