Cypress Trunk Sewer

Cypress Trunk Sewer

Construction on the Cypress Trunk Sewer Project is ongoing, with crews currently working in the City of Cypress. This webpage will be updated regularly with the latest project information. Crews are expected to return to Los Alamitos for night work in January 2026.

To help keep traffic lighter during the holiday season, no construction work will take place from Wednesday, December 24, through Sunday, December 28.

City of Cypress

Current Work

Location: Starting near the intersection of Denni St. and Orange Ave., moving west towards Bloomfield St. (see map below)

Work is taking place at night during low-flow and includes pipe inspection, cleaning, and grouting. 

• When: Ongoing – January 2026*
• Hours: Sunday–Friday, 8:00 p.m.–6:00 a.m.*

Location: Intersection of Moody St. and Lincoln Ave. (see map below)

Crews are performing street restoration work.

• When: Ongoing – early January 2026*
• Hours: Monday–Friday, 8:30 a.m.–4:30 p.m.*

Upcoming Work 

Location: Orange Ave. (see map below)

Crews will perform manhole preparation and rehabilitation at several locations along Orange Ave., with occasional work on Denni St. This first phase will focus on raising manhole frames and covers. A second phase, scheduled for spring 2026, will involve installing new manhole liners.

• When: Starting as early as Monday, December 22 – early January 2026*
• Hours: Monday–Friday, 8:30 a.m.–4:30 p.m.*

Work Impacts: 

• Reduced traffic lanes – left turns may be limited
• Temporary traffic control while work is being performed 
• Increased activity, dust, and noise levels

 *All dates and times are subject to change due to operational factors or inclement weather.

Project Description:

The regional sewer line in the cities of Cypress, Los Alamitos, and La Palma is approximately 50 years old and in need of upgrades. The Cypress Trunk Sewer Project will focus on enhancing about 7 miles of sewer, replacing portions of the pipe with larger diameter pipe to increase the capacity, or rehabilitating other segments of pipe to extend the life of the sewer system. Approximately 100 manholes will also be replaced and/or rehabilitated. These repairs will extend the life of the sewer pipes by another 50 years.

Schedule:
Construction is anticipated to begin in Summer 2025 and last approximately 3 years.

Local Sewer Provider: 

• City of Cypress – Maintenance Division – (714) 229-6760
• City of La Palma – Public Works Division – (714) 690-3310
• City of Los Alamitos – Rossmoor / Los Alamitos Area Sewer District – (562) 431-2223