First Aqueduct Rehabilitation Project

About this Project

The Water Authority is working within the First Aqueduct to rehabilitate sections of Pipelines 1 and 2 and repair or replace aging structures, such as worker entry points. When completed in winter 2020, the project will extend the service life of the pipelines and eliminate the likelihood of future uncontrolled releases of water in this area.

Construction activities will occur in stages along the length of the pipeline, in locations from Escondido in the south to Pala in the north, as shown on the project map. For questions about the project, please call (877) 682-9283, ext. 7009 or email


Within this section of the Water Authority’s system, Pipelines 1 and 2 are between 48-inches and 54-inches in diameter. Pipeline 1 was installed in 1947 and Pipeline 2 in 1954 to transport the first imported water into the San Diego region. A condition assessment was completed in 2014 and determined it was time to replace this section of the system.



Regular construction activities occur Monday through Saturday from 7 a.m. to 7 p.m. This project requires occasional around the clock and night work activities. The Water Authority provides advance notice to nearby neighbors before starting construction at each site and prior to work that is planned to occur outside of regular work hours. 


Project design began 2017
Project design ended June 2018
Project advertised for bid August 2018
Contractor selected September 2018
Construction began October 2018
Anticipated end of construction Winter 2020

*All dates are approximate and subject to change.

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 Portal map




Portal areas are graded and prepared for excavation.

Sound walls and fencing are installed around select portal areas to reduce construction impacts to surrounding areas.

Before their removal, deteriorated pipe sections are excavated and broken at excavated portal areas.

Large diameter pipe sections are delivered to project sites on large flatbed trucks.

Pipe sections are installed into the existing pipe at portal areas; welders fuse them together inside the pipe.

Segments of pipe are welded together to form sections of new pipeline.

Large trucks mix grout at project sites for use in securing new pipe liners to existing pipe sections.

Scaffolding systems are used to deliver grout into portal areas.

Workers lower a final segment of pipe into place at a portal.

Rehabilitated pipe sections are encased in concrete and rebar prior to refilling excavated portals.

Interior of a pipe after mortar lining installation. Pipelines are disinfected before being placed back into service to transport water throughout San Diego County.


Pipeline Relining Overview Video

This project is part of the Water Authority’s Pipeline Relining Program, which is outlined in the video below.

News Stories About Pipeline Relining Projects

CBS 8's Shawn Styles compiled this story after visiting Portals 10 and 12 of a pipeline relining project that traversed portions of La Mesa and Spring Valley.

News Stories About Urgent Carbon Fiber Repair Projects

This ABC 10 News story from 2009 covered an Urgent Carbon Fiber Repair Project completed in Fallbrook, CA.



Click lower right corner of graphic for full screen mode.


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Coming Soon

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Community Presentations & Events
The Water Authority is committed to keeping residents, elected officials, other government and water agencies, businesses, schools, community groups and organizations in the project areas informed about the project. Water Authority staff shared project information at open house and business events and will provide additional information or presentations to stakeholders as the project moves forward.

Project Communications & Open House Events:

December 2, 2019: Postcard for 24-Hour Shutdown Work 

November 14, 2019: Postcard for Shutdown Work - Aguamarina Point

August 2, 2018: Invitation to Project Kickoff Open House

July 26, 2018: Letter to Structure Property Owners - Abandonment Work

July 26, 2018: Letter to Structure Property Owners - Rehabilitation Work

July 20, 2018: General Mailer to Entire Project Alignment

June 14, 2018: Letter to Portal Property Owners

June 11, 2018: Initial Letter to Properties Near Portals

December 4, 2017: Postcard for Animal Monitoring

October 10, 2017: Postcard for Geotechnical Site Soil Core Drilling


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The project belongs to a class of projects which have been determined by the State Secretary for Resources not to have a significant effect on the environment and are, therefore, declared to be categorically exempt from the provisions of CEQA; specifically from the requirement for the preparation of environmental documents. The project fits the definition of Class 1 Existing Facilities (CEQA §15301), which is the repair, maintenance, and minor alteration of existing public structures, facilities, mechanical equipment and topographic features involving no or negligible expansion of existing use.


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For more information, please call the 24-hour toll-free project information line at (877) 682-9283, ext. 7009 or email A representative from the project team will return your call within one business day.


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