Company lists · Data refreshed September 2026

Top 17 Environmental engineering firms based in Los Angeles, United States

Name: Environmental engineering firms based in Los Angeles, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 37 companies tracked

RevenueBase identified 37 company matches for environmental engineering firms associated with Los Angeles, United States as of September 2026 and tracks 1,286 professional contacts across them, including 509 with verified work emails. Across the United States, Houston is the largest hub for this category (138 companies); Los Angeles has 37.

This list covers company matches for environmental engineering firms associated with Los Angeles, United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 16, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 16, 2026 How this list was built

37Companies

1,286Contacts tracked

509Verified emails

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The 17 largest environmental engineering firms based in Los Angeles, United States

Ranked by team size

Top 17 of 37 company matches for environmental engineering firms based in Los Angeles, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 16, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Psomas	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	501-1,000	748 contacts →
	Exact match “Our award-winning projects are produced through innovation, creativity, and technical expertise.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
2	Terra-Petra	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	26 contacts →
	Exact match “Environmental Division - Terra-Petra possess more than 80 years of collective experience in the environmental and soil gas mitigation fields.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
3	Watearth	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	22 contacts →
	Exact match “Watearth, Inc.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
4	Impact Sciences	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	18 contacts →
	Exact match “Informing communities and creating a clear path to understanding are at the core of what we do at Impact Sciences.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
5	BA INC	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	15 contacts →
	Exact match “BA Inc.(DBE/MBE/SBE) has been in business for 11 years; established and incorporated in 2004 to provide professional engineering design services to public agencies for public…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
6	Analysis & Solutions Consultants	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	14 contacts →
	Exact match “Analysis & Solutions Consultants (ASC) plays a key role in the design and construction of many challenging projects.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
7	EPD Consultants, INC	Exact match	Los Angeles, United StatesHQ recorded Sep 16, 2026	1-10	9 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
8	Kroner Environmental Services	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	8 contacts →
	Exact match “Kroner Environmental Services is a full service environmental engineering and consulting company headquartered in Los Angeles but with ongoing operations nationwide.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
9	Khalifeh & Associates Inc, Consulting Engineers	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	6 contacts →
	Exact match “Khalifeh & Associates Inc, Consulting Engineers is a mechanical or industrial engineering company based out of 1625 W.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
10	ZILA	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	6 contacts →
	Exact match “Zila, is a Stormwater Management & Civil Engineering Co, which provides stormwater management and civil engineering related services including stormwater pollution prevention plan…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
11	Andersen Integrated Services	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	4 contacts →
	Exact match “Andersen Integrated Services, Inc.(Andersen) is a full service consulting firm specializing in Forensic Engineering, Environmental, and Specialty Consulting Services.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
12	Suenram & Associates, INC	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	4 contacts →
	Exact match “Suenram & Associates, Inc.(SAI) is a Los Angeles-based certified small business enterprise providing civil engineering design and consulting services for public agencies and…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
13	FLO Engineering INC	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	11-50	2 contacts →
	Exact match “At Flo Engineering, We work collaboratively with government agencies, private clients and the communities we serve, delivering honest, strategic, and timely solutions.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
14	Associated Consulting Civil & Environmental Services, INC	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	1-10	2 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
15	Environmental Review Partners, INC	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	1-10	1 contacts →
	Exact match “Environmental Review Partners, Inc (ERP) is an environmental consulting firm that specializes in California Environmental Quality Act (CEQA) and the National Environmental Policy…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
16	Traffic Associates	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	1-10	1 contacts →
	Exact match “Traffic Associates is a Los Angeles-based civil and traffic engineering firm supporting developers, architects, contractors, property owners, and public agencies with practical…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
17	Atodatech LLC	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 16, 2026	1-10	1 contacts →
	Exact match “ATODATECH LLC is a chemical engineering consulting company based in Greater Los Angeles, CA.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “environmental engineering firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 17 of 37 environmental engineering firms based in Los Angeles, United States

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Environmental engineering firms based in Los Angeles, United States at a glance

As of Sep 16, 2026

39.6%Verified-email coverage

34.8Average contacts per company

11-50Median size (employees)

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Los Angeles, so it is reported there. Company counts and contact totals on this page are exact for Los Angeles, over 37 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with Los Angeles, United States whose business descriptions match “environmental engineering firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 509 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 16, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Environmental engineering firms by metro in the United States

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “environmental engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental engineering firms are there based in Los Angeles, United States?

RevenueBase identified 37 company matches for environmental engineering firms associated with Los Angeles, United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Psomas tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most environmental engineering firms?

Houston leads the United States with 138 company records, followed by New York (101) and Austin (73). Los Angeles has 37.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 509 professional contacts with verified work emails tracked across these 37 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.