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Carollo Engineers

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

Carollo Engineers is an environmental engineering firm that specializes in the planning, design, and construction of water and wastewater facilities. Our firm was founded in Phoenix, Arizona, in 1933 and counts the City of Phoenix among one of our original clients—a working relationship that is 87 years old! From that single office with three engineers, Carollo has grown to more than 1000 people in 47 offices throughout the United States. Our staff includes civil, structural, electrical, mechanical, environmental, and instrumentation and control engineers, as well as scientists, planners, architects, and CAD designers.

Press Releases

Research study provides guidance for pathogen reduction in carbon-based advanced treatment water systems, focusing on ozone and biologically activated carbon filtration for potable...
June 18, 2025
Carollo Engineers
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Discover 'The ABCs of Water Reuse,' a comprehensive visual guide launched by Carollo Engineers to bridge the gap between water professionals and the broader community, aiding ...
May 21, 2025

Videos

Ww Drop E24 Eva Steinle Darling Carollo
With special guest, Carollo's Eva Steinle-Darling.
Jan. 24, 2020
Ww Drop E18 Sarah Deslauriers Carollo
Carollo's Sarah Deslauriers discusses new risk mitigation requirements.
Sept. 16, 2019
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E3 (Dec. 3, 2018): Climate change expert Sarah Deslauriers of Carollo Engineers discusses how concern about greenhouse gas emissions, such as methane, is driving exciting changes...
Dec. 3, 2018

Articles

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Bureau of Reclamation awards El Paso Water $3.5M for Carollo-designed water reuse project.
Dec. 23, 2019
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Direct potable reuse demonstration in Denver 30 years later
Oct. 24, 2019
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New headworks facility in the Bayview honored with Envision Gold status by the Institute for Sustainable Infrastructure.
Aug. 5, 2019

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