Water is all we do
and we do it like no one else

In a world of generalists, a water specialist provides great value.
At Carollo, water is all we do.

This unwavering commitment to the water industry has been a hallmark of the company since our inception in 1933. Over the decades, this single-minded focus has allowed us to make some unique commitments to both clients and staff. It has opened the door to the very best talent in the water industry, innovative water solutions, unparalleled client service, and above all, a collaborative and collegial working environment that makes us a great company to work with.

The fact that this message is as relevant today as it was back in the 1930s is a reaffirmation of the core character and values of our company. The pressing challenges of today’s water industry require the concentrated focus provided by a specialist firm — one that is passionate about water and welcomes the obligation to get the most out of this precious resource.

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Carollo News

 Utah Valley Water Treatment Plant Improvement Project

Our legacy of award-winning projects continues, as the ACEC Utah branch selected Carollo's work on the Utah Valley Water Treatment Plant Improvement Project for the Engineering Excellence Honor Award!

The project restored the plant’s original 80 mgd capacity, delivered an additional 20 mgd at no cost, reduced disinfection byproducts, and improved performance despite tight site...

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The American Academy of Environmental Engineers and Scientists recently selected Carollo’s work on the (Denver) Metro Wastewater Reclamation District’s South Secondary Improvements Project for the AAEES National Design Grand Prize. Carollo’s “one plant” approach helped convert the existing Robert W. Hite Treatment Plant into the largest Biological Nutrient Removal plant in the country. The...

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Water is all we do… and now we do it online. For the past three years, Carollo’s Blue Plan-it® (BPI) decision support system has offered our engineers and clients a powerful one-of-a-kind tool for planning water and wastewater projects. Like most conventional software tools, the BPI desktop version requires license management, software installation, model setup training, and maintenance...

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Carollo Engineers has partnered with the San Diego Unified School District and the Biocom Institute Festival of Science and Engineering to promote Science, Technology, Engineering, Arts, and Mathematics (STEAM) education in local schools.

As part of the SDUSD six-week unit of study focusing on water education, Carollo produced this five-minute video of a young Carollo engineer taking us...

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Before image

The Design-Build Institute of America (DBIA) recently announced its 21st annual Design-Build Project/Team Award winners. Among the recipients was Carollo Engineers, winner of the National Award of Merit in the Water/Wastewater category for the Clifton (Colorado) Water District's Microfiltration/Ultrafiltration Water Treatment Plant Upgrade.

In 2014, the Clifton Water District selected...

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ENR Top Design Firm Cover

Carollo is very proud (and a little bit humbled) to have been selected by Engineering News-Record (ENR) as its 2016 California Design Firm of the Year. This is a huge honor, given not just the spread and size of the California market, but also the impressive list of engineering companies in the state. While we owe much of this honor to the hard work of our employees across the entire company,...

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City of West Sacramento, California

West Sac Bridge District Photo

The Bridge District Water Storage Facility project was required to meet the water demands for the new development of the City of West Sacramento’s Triangle Specific Plan, which envisioned the Bridge District as a dense, pedestrian-friendly, mixed-use area featuring office, residential, and commercial development that would transform the District into an extension of the urban fabric of downtown Sacramento, including extensive riverfront amenities. The facility consists of the major...

Orange County Sanitation District, California

Headworks Rendering

Carollo completed the Plant No. 2 Headworks Replacement Project for the Orange County Sanitation District (OCSD). The new headworks, currently in the construction phase, has a rated capacity of 340 mgd and an estimated construction cost of $192 million. Carollo began preliminary design of the project in the fall of 2001, and final commissioning of the project took place in early 2011. Demolition of existing facilities and modifications to the existing plant are being implemented and will be...

Ak-Chin Indian Community, Arizona

Ak-Chin Aerial

The Ak-Chin Indian Community established long-range goals for economic growth and development. This proposed development would severely overload the Community’s existing water and wastewater infrastructure. Consequently, Community leaders commissioned a Water and Wastewater Feasibility Study that identified a series of critical infrastructure and facility upgrades necessary to accommodate the proposed growth initiatives.

Carollo was selected to provide planning, design, and...



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