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Rank Company
•name
•address
•website		 Employees
•L.A. County (environmental services)
•company total		 Revenue (in millions) Environmental Services Offered
(partial list)		 Profile
•headquarters
•offices (L.A./total)
•year founded		 Top Local Executive
•name
•title
•phone
L.A.
•2023
•2022		 Total
•2023
•2022
1
 Tetra Tech Inc.
3475 E. Foothill Blvd.
Pasadena 91107; tetratech.com		 587
28,000		 NA $4,523
$3,504		 design, consulting, studies, remediation, renewable energy, sustainable infrastructure, solid waste, coastal engineering, water treatment/supply Pasadena
5 / 550
1966		 Dan Batrack
CEO, Chair
(626) 351-4664
2
 Stantec
801 S. Figueroa St., Suite 300
Los Angeles 90017; stantec.com		 2351
NA		 NA
80		 NA
3,884		 site assessment and remediation, permitting and compliance, regulatory liaison, monitoring and management Edmonton
4 / 400
1954		 Amy Chang
Scott Reed
Cara Corsetti
Principal, Architecture
Principal
Senior Principal
(213) 955-9775

3
 Partner Engineering and Science Inc.
2154 Torrance Blvd.
Torrance 90501; partneresi.com		 227
1,350		 13.5
23.6		 269
319		 environmental consulting, site assessments (phase I, phase II, phase III), subsurface testing, remediation, compliance, industrial hygiene, health & safety Torrance
2 / 40
2007		 Joseph Derhake
CEO
(800) 419-4923
1 Business Journal estimate.
NA – Not Available N/A – Not Applicable Note: Information on this list was provided by the companies. Companies are ranked by the number of L.A. County employees involved in environmental engineering/consulting services. To the best of our knowledge, this information is accurate as of press time. While every effort is made to ensure the accuracy and thoroughness of the list, omissions and typographical errors sometimes occur. Please send corrections or additions to the Research Department at [email protected]. ©2024 Los Angeles Business Journal. This list may not be reprinted in whole or in part without prior written permission from the editor. Reprints are available from Wright’s Media (877) 652-5295.
Researched by Deepanjali Batra