Carollo engineers

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Carollo Engineers
Type Employee Owned Corporation
Industry Water and Wastewater Facility Design and Construction
Founded 1933, Phoenix, Arizona
(as Headman, Ferguson, and Carollo)
Headquarters Walnut Creek, California
United States
Key people B. Narayanan
Chief Executive Officer
Employees 800

Carollo Engineers is an environmental engineering firm specializing in the planning, design, and construction management of water and wastewater facilities for municipal and public sector clients in the United States. The firm is headquartered in Walnut Creek, California and currently maintains 38 offices throughout the United States. Carollo has provided services to the City of Phoenix for over 80 years and to Southern California's Orange County Sanitation District for over 50 years.

Carollo Engineers employs civil, structural, electrical, mechanical, environmental, and instrumentation and control engineers as well as scientists, planners, architects and CAD designers; and offers water supply, treatment, and distribution engineering services; and watershed and water resources planning, storm water and urban wet weather planning, permitting and regulatory assistance, computer modeling, master planning, decision support analysis, and financial assistance services, as well as reuse studies. Carollo is also involved in the planning and design of biogas cogeneration and standby power facilities for the water and wastewater industry, as well as provides utility finance, business planning, asset management, infrastructure engineering, and water reclamation/reuse services; and program/construction management services for public work facilities, and industrial and private structures.[1]

The company’s projects include pilot and treatment studies, pump stations, pipelines, solids handling facilities, and reservoirs. It serves public agencies, private developers, and industrial firms. Carollo has offices in Los Angeles, San Francisco, San Diego, Pasadena, Sacramento, Walnut Creek, Fresno, Bakersfield, Fountain Valley, and Riverside, California; Las Vegas and Reno, Nevada; Phoenix and Yuma, Arizona; Portland, Oregon; Seattle, Washington; Boise, Idaho; Salt Lake City, Utah; Broomfield and Littleton, Colorado; Kansas City, Missouri; Chicago, Illinois; Oklahoma City, Oklahoma; Charlotte, North Carolina; Dallas, Houston, Fort Worth, and Austin, Texas; Boston, Massachusetts; and Miami, Tampa, Orlando, Sarasota, Palm Beach, and Hollywood, Florida.

Carollo Engineers is a Regional Sponsor for Water For People, which helps developing countries improve their quality of life by supporting the development of locally sustainable drinking water resources, sanitation facilities and health and hygiene education programs.


John Carollo Engineers Logo

John Carollo joined Sam Headman and Ben Ferguson in setting up the engineering firm of Headman, Ferguson, and Carollo in downtown Phoenix in 1933. In 1957, after Sam Headman had died and Ben Ferguson had retired and sold his interest to John Carollo, the firm became John A. Carollo, Consulting Engineers. The corporation's name was later changed to Carollo Engineers.

During the course of Carollo's history, the firm has completed more than 15,000 engineering projects for the public sector and now employs over 800 employees. Carollo is currently ranked within Engineering News Record's (ENR) top 100 design firms, and is ranked 13 overall for design firms in sewage and solid waste.[2] Almost half of the employees are Registered Professional Engineers and Carollo Engineers is a Registered Professional Corporation.

Logo until 2007

In 1998 the company converted from a partnership to an S-Corporation. In 2001, the company merged with Denver-based Morroni Engineering, Inc. to further expand their reach in the electrical, instrumentation and control fields. In early 2007, Carollo Engineers created a new logo and trademarked the tag line "Engineers... Working Wonders With Water".


  1. ^ [1] Business Week
  2. ^ [2] Engineering News-Record: Top 25 Design Firms in Sewerage

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