ERG’s clients include retail chains, developers, oil companies, industrial facilities, lending institutions, and various public agencies. The following is a partial list of our clients.

Developers Commercial / Industrial
Arroyo & Coates

Carmel Partners

Ghilotti Brothers Construction Services

McHugh Properties

Pullman Building Company

Seagate Properties

The DeSilva Group

Valentine Corporation

Brandenburg Properties


House Properties

Wood Partners

Krausz Companies

Rawson Blum Leon

Advanced Grinding

Alamo Rent-A-Car

Alpine Meadows Ski Area

Aydin Corporation

Build Group Inc.

San Jose Construction

Coca Cola Corporation

Dennys Restaurants

Nicholson Ranch Vineyards

Paccar Corporation

Pacific Bell

Pomeroy Recreation and Rehabilitation Center

Squaw Valley

Wells & Associates

Westinghouse Corporation

Westrec Marinas

Public Sector Consultants
California State Architect


City of Huntington Beach

City of Inglewood

Los Angeles Department of Water and Power

City of Morcno Valley

City of San Francisco

City of San Rafael

City of San Jose

City of Santa Ana

College of Marin

County of Los Angeles

County of Marin

County of Riverside

County of San Bernardino

County of Santa Barbara

County of Sonoma

County of Ventura

Orange County Transportation Authority

San Francisco Presidio

Santa Clara County Transit Authority

United States Postal Service

Azure Environmental

Baywood Environmental

Cambria Environmental

Dames & Moore

Equiva Services, LLC

Harding Lawson Associates

L&W Environmental

Levine Fricke Recon

Kelleher & Associates



Pacific Environmental Services



Central Valley Environmental