Cypress Trunk Sewer

Cypress Trunk Sewer

Safe and efficient progress continues on the Cypress Trunk Sewer Project, where crews are working both day and night to keep the project on track. Stay informed on the latest project updates by visiting this page regularly.

Upcoming Work

Location: Orange Ave. at Alderbury St.

Crews will be working on Orange Ave. to replace a section of sewer pipe. To maintain uninterrupted service during construction, crews will first install a temporary bypass system to reroute flow, then excavate the work area, and place the new section of pipe.

• When: Starting Tuesday, February 17 – late March 2026*
• Hours: Monday – Saturday, 7:00 a.m.– 7:00 p.m.*
  • Crews will be working extended hours and days to shorten the overall duration of the work.
• Work Impacts:
  • Access to the neighborhood will be closed at Alderbury St. and Orange Ave. Please use Newman Ave. and follow all posted signs.
  • Reduced traffic lanes – left turns may be limited to and from Julie Beth St.
  • Crosswalks and bike lanes will be closed within the traffic control area until the work is completed.
  • Traffic control barriers will remain in place throughout the duration of work.
  • Increased activity, dust, and noise levels.

Current Work

Location: Following the project alignment between Orange Ave. and Katella Ave. (see the dark blue line on map below)

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

• When: Currently ongoing
• Hours: Sunday – Friday, 8:00 p.m.–6:00 a.m.*

Location: Denni St. and Bloomfield St. (see map below)

Crews are currently performing manhole rehabilitation work, which includes installing new frames, covers, and liners. Work is taking place at multiple locations along Bloomfield St. and Denni St. in the cities of Cypress and Los Alamitos. Occasional work may take place along Moody St. and Orange Ave. 

• When: Ongoing – late February 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 began in Summer 2025 and is anticipated to 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