Federal Agencies
- U.S. Army Corps of Engineers, Los Angeles District
State Agencies
- Caltrans
- University of California
Counties
- Los Angeles
- Riverside
- Orange
- San Diego
Cities
- Anaheim
- Apple Valley
- Bakersfield
- Brea
- Corona
- Costa Mesa
- Dana Point
- Diamond Bar
- Encinitas
- Excel Legacy
- Fullerton
- Garden Grove
- Glendora
- Huntington Beach
- Irvine
- Laguna Beach
- Lancaster
- Lake Elsinore
- Lake Forest
- Long Beach
- Los Angeles
- Moorpark
- Newport Beach
- Oceanside
- Ontario
- Orange
- Oxnard
- Palmdale
- Palos Verdes
- Pomona
- Pasadena
- Rancho Cucamonga
- San Diego
- San Dimas
- San Juan Capistrano
- San Marcos
- Santa Ana
- Santa Clarita
- Signal Hill
- Temecula
- Tustin
- Vista
- Walnut
- West Covina
- Yorba Linda
Special Districts, Utilities and Institutions
- Atchison, Topeka & Santa Fe
- Castaic Lake Water Agency
- Catholic Diocese of Orange
- Cucamonga County Water District
- Irvine Ranch Water District
- L. A. Community College District
- L. A. County Sanitation Districts
- L. A. Department of Water & Power
- Las Virgines School District
- March Joint Powers Authority
- Orange County Integrated Waste
- Orange County Sanitation Distrtict
- Orange County Water District Management Department
- Palmdale Water District
- Puente Hills Landfill Native Habitat
- Preservation Authority
- MCI – WorldCom
- Saddleback Valley Community Church
- Santa Margarita Water District
- Yorba Linda Water District
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Regional Agencies
- Orange County Transportation Authority
- Southern California Association of Governments
- Transportation Corridor Agencies
Airports
- John Wayne Airport
- Long Beach Airport
Private Sector
- AKM Consulting Engineers
- Andrade Architects
- Benchmark Real Estate Group
- Best, Best & Krieger
- Boyle Engineering
- Brookfield Davidson Homes
- Bryan A. Stirrat & Associates
- Burnett Companies
- Camp, Dresser, McKee
- Capital Pacific Holdings
- Centex Homes
- CH2M Hill
- Chandler Real Properties
- C.J. Segerstrom & Sons
- Coscan-Davidson Homes
- Crescent Bay Company
- Crosby, Mead, Benton & Associates
- Crummer Realty Management
- Group
- Deleuw, Cather & Company
- DMJM
- D.R. Horton
- Evans-Collins Community
- Builders
- Excel Legacy
- Fieldstone Company
- General Dynamics Properties
- GeoSyntec Consultants
- Gibson, Dunn & Crutcher
- Goffman McCormick & Urban
- Grace Ministries International
- Griffin Homes
- Hoag Hospital
- Hogle Ireland
- HNTB
- Intravia Rock and Sand, Inc.
- Irwin Architectural Services
- Jacobs Engineering
- Jamison Engineering
- JCC Homes
- John M. Tettemer Associates
- JPI
- K Hovnanian
- KB Home Costal Inc.
- Keith Companies
- KFM Engineering
- Kimley-Horn & Associates, Inc.
- LAN Engineering
- Lansing & Associates
- Lennar Partners
- Lewis Homes
- LSFII Fullerton, LLC
- Lyon Homes
- Makar Properties
- Malcolm Pirnie, Inc.
- MBK Senior Living Communities,
- Limited
- Metro Point Engineers
- MIG
- MJW Development
- Moffatt & Nicol
- Montgomery Watson Harza
- Morrison & Forrester
- NorthLake LLC
- Nossaman, Gunther, Knox & Elliot
- Ogden Enviornmental & Energy
- Olson Company
- Parsons Engineering Science
- Parsons Brinckerhoff
- Providence Residential
- Psomas and Associates
- Pulte Homes
- Quade & Douglas
- Rancho Mission Viejo Company
- RBF Consulting
- Richmond American Homes
- RJM Design Group
- Ron Martin & Associates
- RSM Management Company
- San Juan Group
- Shapell Industries
- Shea Homes
- Standard Pacific
- Stonegate Development
- STV Inc.
- Sukut Construction
- SunCal Companies
- Talega Development Company
- Taylor-Hunter Associates, Inc.
- Tetra Tech, Inc.
- The Irvine Company
- The Koll Company
- Trammell Crow
- Unocal Land & Development
- Company
- Urban Pacific Builders
- URS Griener Woodward Clyde
- Vintage Communities
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