Twin Oaks Pipeline Relining

Project Background

This project relined about one mile of large-diameter concrete pipeline adjacent to North Twin Oaks Valley Road in the unincorporated area located just north of San Marcos. New steel liners will be inserted into the existing pipeline, which will extend its service life by 75 years or more. To minimize impacts, the relining was done underground through access portals rather than trenching.

This project is part of a long-term initiative to rehabilitate 82.5 miles of aging critical water infrastructure that supplies safe and reliable water throughout the San Diego region.

Project Status: Completed

Construction on the Twin Oaks Valley Road Relining Project started in Fall 2022 and was completed in Summer 2023.