San Luis Rey Relining Project


Project introductory postcard

Hot Off the Press

Major Construction Complete

The San Luis Rey Pipelines Relining Project finished in early 2015 and relined portions of three pipelines near the San Luis Rey River, extending the service life of the pipelines by 75 years. Caltrans will now be able to widen and realign State Route 76 over the pipelines. 

About This Project

Construction crews conducted most of the work underground, inside the pipe. The work did not interrupt water service to nearby homes and businesses.

The pipe was accessed by excavating a 36- to 40-foot area. Once excavated, the existing pipe was accessed and relining materials, including steel liners, were installed. The excavated sites, called portals, were surrounded by temporary large wooden sound walls, if needed, to ease noise impacts to residents, comply with environmental regulations, and for security and safety precautions.


Completed Milestones

Project Design Began Dec. 2013
Final Mitigated Negative Declaration approved by Board of Directors May 22, 2014
Project Construction Began August 2014
Project Construction Ended March 2015


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Project location map







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Trucks deliver pipe sections to portals

A welder welds the joint of two pipe sections

Fitting up a new liner section

Inserting new liners


Videos Here




Other Multimedia Here


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Meeting Summaries:
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Community Outreach

The Water Authority is committed to keeping residents, elected officials, businesses, schools, community groups and organizations in the project area informed about the project.

Water Authority staff will make every effort to inform the following community groups and stakeholders about the project:

·     Agricultural/Farm Operators
·     Caltrans
·     City of Oceanside
·     Fallbrook Public Utilities District
·     Friends of the River
·     Rainbow Municipal Water District
·     San Diego County’s Parks and Recreation
·     San Luis Rey Watershed Council

If your group or organization is not on this list, but would like to be, please contact us at (877) 682-9283, Ext. 7005 or e-mail us at . Please include your organization’s name and contact information.

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The final environmental document, a mitigated negative declaration, was approved by the Water Authority's Board of Directors on May 22, 2014. To review the documents, please visit this link:  

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For more information, please call the 24-hour toll-free project information line at (877) 682-9283, Ext. 7005 or email A representative from the project team will return your call within one business day.


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