City Of Oxnard Selects Carollo Engineers To Oversee Construction Of $46M Water Resource Recovery Facility Upgrade

Major infrastructure project will rehabilitate critical treatment infrastructure to maintain reliable service

The City of Oxnard has selected Carollo Engineers to provide construction management and inspection services for the Primary Clarifiers and Activated Sludge Tank Improvement Project at the City’s Water Resource Recovery Facility (WRRF). The project represents a significant investment in safeguarding the community's water and wastewater infrastructure while meeting all regulatory requirements cost-effectively.

The WRRF serves Oxnard's growing community of approximately 210,000 residents. The facility operates as part of an extensive wastewater system that includes over 400 miles of sewer lines, 15 lift stations, and a 31.8 million gallons per day treatment plant.

The $46M improvement project was identified as part of Oxnard’s 2025-2029 Capital Improvement Program. The City has committed substantial resources to this major initiative to modernize its critical treatment infrastructure to improve treatment reliability and operational efficiency while enhancing water quality protection.

Carollo’s selection follows the firm’s successful delivery of construction management services for the City’s Advanced Metering Infrastructure Project to replace over 41,000 water meters across the city.

"The success of our Advanced Meter Infrastructure Project was in large part due to the dedication and expertise of the Carollo construction management team," said Tim Beaman, Assistant Public Works Director for the City of Oxnard Public Works Department, Water & Wastewater. "We look forward to continuing our partnership with a $46M upgrade of Oxnard's primary clarifiers and activated sludge tanks."

Primary clarifier work includes basin improvements, installation of a new odor control system, and replacement of all mechanical equipment as well as primary sedimentation building upgrades.

The activated sludge tanks will undergo seismic retrofitting of existing basins and complete replacement of the aeration system. New submersible mixers will be installed alongside upgraded instrumentation and enhanced control systems to provide optimal operational performance.

The upgrades will deliver significant environmental and community benefits to Oxnard’s growing population. The new odor control system will improve air quality while the modernized aeration system will reduce energy consumption—a critical step toward lowering the facility's carbon footprint and advancing the City's sustainable infrastructure goals.

"We are honored that the City of Oxnard has again entrusted Carollo to oversee critical infrastructure improvements for the community," said Rodolfo Garcia, Carollo Construction Manager. "This project represents a significant milestone in modernizing the Water Resource Recovery Facility, and our team is committed to working as an extension of City staff to deliver these essential upgrades."

Construction is anticipated to begin in Q1 2026 and span approximately 2.5 years, with the WRRF remaining fully operational throughout the upgrade process. The project is scheduled for completion and closeout in Q3 2028.

About Carollo Engineers
For more than 90 years, Carollo Engineers has provided a full range of innovative planning, design, and construction management services to address the water needs of municipalities, public agencies, private developers, and industrial clients. Carollo develops robust water management strategies that leverage collaboration, provide multi-benefit solutions, and achieve sustainability and resilience. Carollo has over 1,700 employees located across North America. For more information, visit www.carollo.com