Cypress Trunk Sewer

Cypress Trunk Sewer

Work is ongoing in the City of Cypress on Crescent Ave. and Denni St. to install a bypass system for upcoming pipe replacement work in Forest Lawn Cemetery.

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Current Work: City of Cypress

Location: Guardian Dr. within Forest Lawn Cemetery 

Crews are preparing for pipe replacement work within Forest Lawn Cemetery by rerouting existing water lines, setting surface monitoring points, and installing a bypass system to reroute sewer flow during construction. To minimize impact to the community, construction work will be done at night. 

• When: Ongoing – December 2026*
• Work Hours: Sunday – Friday, 8:00 p.m. – 6:00 a.m.*
• Work Impacts: 
  
  • Increased activity, dust, and noise levels

Location: Denni St. between Fontainbleau Way and Crescent Ave.

A bypass system is being installed to reroute sewer flow and continue providing service to the community during pipe replacement work within Forest Lawn. The bypass system includes above ground pumps and buried pipes beneath the street. Once the system is in place, pits will be excavated to insert a machine that will replace the pipe. Further details about this work will be shared as construction progresses.

• When: Ongoing – late August*
• Work Hours: Monday – Friday, 8:00 a.m. – 5:30 p.m.*
  • Please note: Once installed, the bypass systems will be operating continuously.
• Work Impacts: 
  
  • Reduced traffic lanes; flaggers will be present to direct traffic.
  • No parking on the eastside of Denni St. across from the bypass pumps. Additional parking restrictions may be needed—please follow all posted signs
  • Temporary closures on Denni St. Residential access will remain—follow detour signs.
  • Permanent traffic control around the bypass pumps.
  • Increased activity, dust, and noise levels, including humming from the bypass pumps. Noise barriers will be in place.

Location: Crescent Ave. between Acacia Dr. and Martinique Way

Additional bypass pumps will be installed on Crescent Ave. to ensure continuous sewer service. 

• When: Ongoing – late August*
• Work Hours: Monday – Friday, 8:00 a.m. – 5:30 p.m.*
  • Please note: Once installed, the bypass systems will be operating continuously.
• Work Impacts: 
  
  • Restricted left turns to and from Gay St., Denni St., and Beach Cir. Additional turns may be limited–please follow all posted signs.
  • Reduced lanes; thru traffic will remain on Crescent Ave.
  • Permanent traffic control around the bypass pumps.
  • Increased activity, dust, and noise, including humming from the bypass pumps. Noise barriers will be in place.

Upcoming Work: City of Cypress

Location: Moody St. and Denni St.

Crews will be performing manhole rehabilitation work, including installing liners. Work at each manhole location will take approximately 2-3 days*

• When: Week of June 15 *
• Work Hours: Monday – Friday, 8:30 a.m. – 4:30 p.m.*
• Work Impacts: 
  • Reduced traffic lanes
  • 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