The City of Oxnard, California, has selected Carollo Engineers to provide construction management and inspection services for upgrades at the city’s Water Resource Recovery Facility (WRRF).
A press release from Carollo notes the project represents a major 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 city operates an extensive wastewater system that includes more than 400 miles of sewer lines, 15 lift stations and a 31.8 million gallons per day treatment plant.
The $46 million 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.
Recently, Carollo also partnered with the City of Oxnard on the successful deployment of its advanced metering infrastructure (AMI) project, which replaced more than 41,000 water meters across the city. Carollo provided construction management service on the AMI project.
“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 $46 million upgrade of Oxnard’s primary clarifiers and activated sludge tanks.”
Carollo will now provide construction management and inspection services for the the WRRF’s Primary Clarifiers and Activated Sludge Tank Improvement Project. 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. The project will also install new submersible mixers alongside upgraded instrumentation and enhanced control systems to provide optimal operational performance.
The upgrades are expected to deliver environmental and community benefits to Oxnard’s increasing population. The new odor control system, Carollo said, 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 two and a half years, scheduled for completion and closeout in Q3 2028. The WRRF will remain fully operational throughout the upgrade process.
Source: Carollo
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