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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.
•2024
•2023		 Total
•2024
•2023
1
 Tetra Tech Inc.
3475 E. Foothill Blvd.
Pasadena 91107; tetratech.com		 610
30,000		 NA $5,200
$4,523		 design, consulting, studies, remediation, renewable energy, sustainable infrastructure, solid waste, coastal engineering, water treatment/supply Pasadena
5 / 500
1966		 Roger Argus
CEO
(626) 351-4664
2
 SCS Engineers
3900 Kilroy Airport Way, Suite 300
Long Beach 90806; scsengineers.com		 224
1,311		 42
40		 566
497		 solid and hazardous waste management, landfill gas, site remediation, renewable energy, regulatory compliance for air, water, and soil, biogas, anaerobic digestion Long Beach
7 / 74
1970		 Michelle Leonard
Senior VP & Project Director
(800) 767-4727
3
 Stantec
801 S. Figueroa St., Suite 300
Los Angeles 90017; stantec.com		 2001
29,000		 NA NA site assessment and remediation, permitting and compliance, regulatory liaison, monitoring and management Edmonton
4 / 400
1954		 Amy Chang
Principal, Architecture
(213) 955-9775
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]. ©2025 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