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Seeing the bigger picture for 90 years

Since 1933, we’ve helped millions of people lead better lives through the availability of clean water – but our work is not done. While we reflect on our 90th Anniversary with pride and gratitude, we are fueled by this milestone to continue striving for an even better future for us all.

El Paso water treatment plant
John Carollo and team design first water treatment plant in El Paso, Texas, which is still in operation
desalination facility
Designed the first desalination plant to serve as a U.S. city’s sole source of drinking water
shower head closeup
Carollo Research Group is created – pioneering and validating many innovations like UV disinfection and CFD modeling
2009 Bay Area
Completed a Bay Area WWTP renewable energy expansion, helping the agency become one of the first net energy-positive utilities in the world
water being processed in bottles
Performed water quality study for the first-ever direct potable reuse plant in the U.S., demonstrating for the first time that DPR is safe
three children learning in classroom
Carollo Cares community outreach program begins, inspiring a new generation of water professionals
scientist taking water sample
Water ARC®, Carollo’s applied research center, is created, linking lab innovation to real-world application
Mentor and student at computer
Employee Leadership Program begins – inspiring and empowering current and future leaders at Carollo
earthquake resistant building
Designed the largest earthquake resistant ductile iron pipe project in North America, providing additional safeguards for California’s water supply
Completed two award-winning projects for the production and reuse of renewable natural gas from wastewater (digester gas)
Collaborated with an international team to evaluate AI and machine learning in making water purification more efficient
Vancouver water facility
Established 50th office and the first office outside the continental U.S. in Vancouver, Canada
picture of a water treatment facility from above
Serving as Owner’s Advisor for the City of Houston’s 320 mgd water treatment plant expansion – the largest progressive design-build project in the U.S.
El Paso DPR
Designing the El Paso Advanced Water Purification Facility — the first direct-to-distribution direct potable reuse system in the United States
You are a critical part of our 90-year story. See how.

Working Wonders with Water®

For more than 90 years, Carollo Engineers has been 100% focused on water and wastewater solutions. For our clients, this means expertise and experience that deliver improved performance, minimized risk, and capital reductions—helping you stay ahead of potential issues. For our employees, it means being a part of something that can change lives, and the world we live in.

Woman measuring water levels

Innovating through focus.

When you do one thing, and do it well, amazing things happen. New thinking emerges. Ideas are born. When you partner with us, as a client or employee, you’ll find innovation comes standard. It’s not innovation for innovation's sake—we generate proven solutions that fit clients’ needs and budget, as well as inspire us.

Man checking water tanks

Experts in all that is water.

Because water is all we do, we put all our resources into your project. From drinking water and wastewater to water reuse and so much more, our breadth of expertise is comprehensive.

View our Expertise
Woman and girl watering plants in greenhouse

We care about our communities and planet.

Clean, safe water is a foundation for healthy ecosystems and thriving communities. Sustainability, education, charity, and a caring culture aren’t just words to us. They are what drive us every single day, igniting passion in our employees, customers, and our youth.

See How Carollo Cares

Is water your passion, too?

If so, consider joining our team. You’ll collaborate with coworkers who are the best and the brightest, challenge yourself on exciting work, and help build the best water consulting firm in the U.S.

Working at Carollo

View open positions

Woman smiling on job site
“Carollo has a unique and progressive culture. I’m challenged every day and have grown professionally and personally.”

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