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- Michael Baker Corp.
Oakland
- Balance Hydrologics, Inc.
Berkeley, San Rafael, Santa Cruz
- Battelle
Carlsbad, San Francisco
- Bechtel Corporation
San Diego, San Francisco
- R.W. Beck
Sacramento, San Diego
- Big Rock Creek Camp
Valyermo
- Black & Veatch
Corona, Dublin, Irvine, Los Angeles,
Rancho Cordova, San Diego, Walnut Creek
- Blasland, Bouck & Lee, Inc.
Irvine
- Blymyer Engineers, Inc.
Alameda
- Bodycote Materials Testing
Santa Fe Springs
- Booz Allen Hamilton Inc.
Los Angeles, San Diego, San Francisco, Santa Maria
- Boyle Engineering Corp.
Many locations
- Brown and Caldwell
Irvine, Oxnard, Rancho Cordova,
San Diego, Walnut Creek
- Burns & McDonnell
San Diego, South San Francisco
- Cadmus Group, Inc.
Santa Monica
- CALIBRE Systems, Inc.
Sacramento
- California Environmental Associates
San Francisco
- California Water Service Group
Many locations
- Cameron-Cole, LLC
Alameda
- Cambridge Systematics, Inc.
Oakland
- Camp High Trails
Angelus Oaks
- Campbell Group, Inc.
Fort Bragg
- CAPE Inc.
Irvine
- Carlton Engineering, Inc.
Shingle Springs
- Carollo Engineers
Many locations
- Carter & Burgess Inc.
Costa Mesa, Los Angeles, Oakland, Sacramento, San Jose
- Cascade Earth Sciences
Bakersfield
- CDM
Many locations
- CEI
Fresno
- Cemtek Inc.
Santa Ana
- CH2M Hill
Many locations
- Chemical Data Management Systems, Inc.
Dublin, Signal Hill
- Clean Harbors, Inc.
Buttonwillow, Los Angeles, San Diego, San Jose
West Sacramento, Westmorland
- Clear Water Compliance Services, Inc.
Loomis
- Columbia Analytical Services, Inc.
Canoga Park, Elk Grove, Los Gatos,
Redding, Sacramento, Simi Valley
- Concurrent Technologies Corp.
Oakland, San Diego
- Condor Earth Technologies, Inc.
Irvine, Jamestown, Sonora, Stockton, Turlock
- Conestoga - Rovers & Associates
Stockton
- Converse Consultants
Costa Mesa, Monrovia, Redlands
- R.C. Costello & Associates, Inc.
Redondo Beach
- J. Fletcher Creamer & Son, Inc.
Sylmar
- C & S Companies
San Diego
- CSA International
Monterey
- CSW/Stuber-Stroeh Engineering Group
Novato, Petaluma, Sacramento
- Cubellis Inc.
Newport Beach
- Custom Environmental Services
Santa Barbara
- California Companies: D - F, G - L, M - R, S - Z.
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