Southern California Region

For more than 30 years, ESA has been providing environmental analysis and planning on a wide range of Southern California projects–from residential development to solar farms to regional water infrastructure.

From the largest water district in the western U.S. to the U.S. Bureau of Land Management’s pioneering fast-track solar approval process, our experts collaborate with a range of municipal, state, federal, Native American, and private-sector clients to deliver innovative solutions unique to Southern California.

Our success is grounded in the depth of our local experts, and supported by specialized staff throughout the company. We understand how important it is to be close to our clients from Inyo to San Diego County and everywhere in between, so we’ve strategically located our offices.


770 Paseo Camarillo Ste 310
Camarillo, CA 93010
Greg Ainsworth
Fax: 805.914.1501


2121 Alton Pkwy Ste 100
Irvine, CA 92606
Steve Nelson
Fax: 949.753.7002

Los Angeles

626 Wilshire Blvd Ste 1100
Los Angeles, CA 90017
Tom Barnes
Fax: 213.599.4301


80 South Lake Ave Ste 570
Pasadena, CA 91101
Heidi Rous, CPP

San Diego

550 West C St Ste 750
San Diego, CA 92101
Bobbette Biddulph
Fax: 619.719.4201

Santa Monica

233 Wilshire Blvd Ste 150
Santa Monica, CA 90401
Jay Ziff