Sewer Siphon Improvements Project

Irvine Ranch Water District contractors will be making improvements to several of the District’s sewer siphons, which divert sewage flow under, over or around an obstacle such as a creek.

Pre-construction cleaning and inspections of three siphon locations (S3, S5, and S18) will take place in January and February of 2025. These activities will take place between 9 a.m. and 3 p.m.

Construction will take place from April  2025 to April 2026, completing work at one location before moving on to the next.

Improvements at each site will vary, but may include some or all of the following:

• Removal and replacement of concrete slabs
• Installation of new composite manholes
• Installation of flow control devices
• Coating of concrete surfaces
• Site improvements
• Air vent installation
• CIPP lining of siphon barrels

What: Sewer siphon improvements

When: April 2025 to April 2026, with each location taking about two months to complete.

Construction hours will vary by location:

• S1: (San Diego Creek & University) 8 a.m. to 4:30 p.m.
• S3: (Michelson & Riparian) 7 a.m. to 3:30 p.m.
• S5: (Jamboree & Main) 9 a.m. to 3 p.m.
• S8: (Jeffrey & Alton) 8 a.m. to 4:30 p.m.
• S9: (Sand Canyon & Barranca) 7:30 a.m. to 3:30 p.m. Night work near Sand Canyon Medical Center from 9 p.m. to 5:30 a.m.
• S16: (University & Milano) 7 a.m. to 3:30 p.m.
• S18: (Harvard & University) 9 a.m. to 3 p.m.

Click on the blue bar below for construction updates.

For more information, please email info@IRWD.com or call 949-453-5500.