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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
 Kimley-Horn and Associates Inc.
660 S. Figueroa St., Suite 2050
Los Angeles 90017; www.kimley-horn.com		 3471
7,400		 NA 2,442
2,035		 CEQA/NEPA, initial studies, impact reports, assessments, agency permit processing, planning, outreach programs Raleigh, N.C.
2 / 127
1967		 Jason Matson
Senior VP
(213) 261-4040
3
 Psomas
865 S. Figueroa St., Suite 3200
Los Angeles 90017; psomas.com		 3001
NA		 NA NA
1331		 CEQA/NEPA documents, air quality/noise, cultural/tribal resources, biological, regulatory permitting, habitat restoration Los Angeles
4 / 18
1946		 Alysen Weiland
VP, Los Angeles Regional Office Manager
(213) 223-1400
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 on company letterhead to the Research Department, Los Angeles Business Journal, 11150 Santa Monica Blvd., Suite 350, Los Angeles 90025. ©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