Carollo Engineers Wins Placer County WTP Management Contract

Placer County is embarking on a $210 million water treatment plant, yet the crucial construction management contract for the first phase was awarded to Carollo Engineers for just $271,960.

RD
Rick Donovan

June 23, 2026 · 2 min read

Engineers overseeing the construction of a large, modern water treatment plant in Placer County, highlighting the scale and complexity of the project.

Placer County is embarking on a $210 million water treatment plant, yet the crucial construction management contract for the first phase was awarded to Carollo Engineers for just $271,960. (Construction Dive) Less than 0.13% of the total project value (The Raincross Gazette) was allocated for oversight on a massive public works project.

Industry standards typically place construction management fees between 3% and 7% of a project's total cost. The Ophir contract falls significantly below this range. Such disparity indicates public agencies may be underestimating the value of robust project oversight, increasingly relying on specialized firms whose fractional fees might obscure the true cost of expertise.

Placer County's $210 Million Water Investment

  • Placer County Water Agency (PCWA) selected Carollo Engineers to provide construction management and SCADA programming services for the Ophir Water Treatment Plant, according to Smart Water Magazine.
  • The total estimated construction cost of the Ophir WTP Phase 1 is $210 million, Smart Water Magazine reports.
  • The facility will initially deliver an additional 10 million gallons per day (MGD) of treated water capacity, according to Smart Water Magazine.

Carollo's dual role in construction management and specialized SCADA programming is crucial for the plant's operational efficiency. This significant investment aims to deliver an additional 10 MGD of treated water, a critical boost for regional supply. The successful execution of this initial phase will set the precedent for future stages of the Ophir Water Treatment Plant, ensuring long-term water security for Placer County residents.

The Strategic Importance of the Ophir Plant

Located on a 22-acre site along Ophir Road in Auburn, California (Construction Dive), the Ophir plant's position is strategic for efficient water distribution and future expansion. This supports long-term water resource management for Placer County's growing population.

Carollo's Broader Expertise in Water Management

Riverside has contracted with Carollo Engineers to analyze future water bills (The Raincross Gazette). This shows Carollo's expertise extends beyond construction oversight. Their capabilities encompass critical financial and planning aspects of water utility management, suggesting a broader value proposition than the Ophir contract alone implies.

Given the significant disparity in oversight fees compared to industry norms, future large-scale public works projects in California will likely prompt a re-evaluation of construction management budgeting by agencies like PCWA to ensure long-term infrastructure integrity.