Company lists · Data refreshed September 2026

Top 25 Environmental consulting firms based in Los Angeles, United States

Name: Environmental consulting 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 12, 2026 65 companies tracked

RevenueBase identified 65 environmental consulting firms headquartered in Los Angeles, United States as of September 2026 and tracks 1,048 professional contacts across them, including 565 with verified work emails and 549 with mobile numbers. Houston is the largest hub.

This list covers environmental consulting firms headquartered in Los Angeles, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 12, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 12, 2026 86% judged on-target in blind review

65Companies

1,048Contacts tracked

565Verified emails

549Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest environmental consulting firms based in Los Angeles, United States

Ranked by team size

Top 25 of 65 environmental consulting firms based in Los Angeles, United States, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to environmental consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Psomas	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	501-1,000	748 contacts →
	Indirect evidence “Our award-winning projects are produced through innovation, creativity, and technical expertise.” Source: RevenueBase Database · checked Sep 12, 2026
2	Gnarus Advisors LLC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	29 contacts →
	Indirect evidence “Gnarus Advisors combines economic, scientific, engineering, and regulatory expertise to provide clients with multidimensional support on a wide range of challenges affecting their…” Source: RevenueBase Database · checked Sep 12, 2026
3	Terra-Petra	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	26 contacts →
	Partial evidence “Environmental Division - Terra-Petra possess more than 80 years of collective experience in the environmental and soil gas mitigation fields.” Source: RevenueBase Database · checked Sep 12, 2026
4	Watearth	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	22 contacts →
	Indirect evidence “Watearth, Inc.” Source: RevenueBase Database · checked Sep 12, 2026
5	Impact Sciences	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	18 contacts →
	Indirect evidence “Informing communities and creating a clear path to understanding are at the core of what we do at Impact Sciences.” Source: RevenueBase Database · checked Sep 12, 2026
6	Leading Edge	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	17 contacts →
	Indirect evidence “Leading Edge is a California based sustainability consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
7	Analysis & Solutions Consultants	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	14 contacts →
	Indirect evidence “Analysis & Solutions Consultants (ASC) plays a key role in the design and construction of many challenging projects.” Source: RevenueBase Database · checked Sep 12, 2026
8	Reliance Safety Consultants, INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	11 contacts →
	Partial evidence “Reliance Safety Consultants (RSC) is a people‑first Environmental, Health & Safety consultancy supporting construction, manufacturing, and high‑risk industries across California…” Source: RevenueBase Database · checked Sep 12, 2026
9	Ecomotion	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	10 contacts →
	Strong evidence “EcoMotion provides sustainability advising and consulting cities, counties, utilities, corporations, and campuses to help them achieve their energy and environmental goals.” Source: RevenueBase Database · checked Sep 12, 2026
10	Kroner Environmental Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	8 contacts →
	Strong evidence “Kroner Environmental Services is a full service environmental engineering and consulting company headquartered in Los Angeles but with ongoing operations nationwide.” Source: RevenueBase Database · checked Sep 12, 2026
11	Argento Graham	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	7 contacts →
	Partial evidence “Argento/Graham offers strategic and technical green building consulting services to all stakeholders involved in the development and operation of new and existing buildings.” Source: RevenueBase Database · checked Sep 12, 2026
12	Strategic Earth Consulting	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	7 contacts →
	Partial evidence “At Strategic Earth Consulting, we believe that inclusive dialogue leads to better decisions.” Source: RevenueBase Database · checked Sep 12, 2026
13	Khalifeh & Associates Inc, Consulting Engineers	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	6 contacts →
	Partial evidence “Khalifeh & Associates Inc, Consulting Engineers is a mechanical or industrial engineering company based out of 1625 W.” Source: RevenueBase Database · checked Sep 12, 2026
14	ZILA	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	6 contacts →
	Indirect evidence “Zila, is a Stormwater Management & Civil Engineering Co, which provides stormwater management and civil engineering related services including stormwater pollution prevention plan…” Source: RevenueBase Database · checked Sep 12, 2026
15	Labeling Sustainability INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	5 contacts →
	Partial evidence “At Labeling Sustainability, we are dedicated to guiding manufacturers, their suppliers and their distributors through the intricate journey of environmental accountability.” Source: RevenueBase Database · checked Sep 12, 2026
16	Earthara	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	4 contacts →
	Indirect evidence “We work across sectors, partnering with clients ranging from startups and small businesses to Fortune companies.” Source: RevenueBase Database · checked Sep 12, 2026
17	Andersen Integrated Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	4 contacts →
	Strong evidence “Andersen Integrated Services, Inc.(Andersen) is a full service consulting firm specializing in Forensic Engineering, Environmental, and Specialty Consulting Services.” Source: RevenueBase Database · checked Sep 12, 2026
18	Harris Consulting Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	3 contacts →
	Partial evidence “Harris Consulting Group has established itself as one of the premier Construction Management and Consulting firms in the region.” Source: RevenueBase Database · checked Sep 12, 2026
19	Insight Energy Consulting	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	3 contacts →
	Partial evidence “At Insight Energy Consulting, our mission is to innovate and lead in energy efficiency and sustainability.” Source: RevenueBase Database · checked Sep 12, 2026
20	Livingworks	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	2 contacts →
	Indirect evidence “LivingWorks is a forward thinking firm focused on creative, practical, and cost-effective sustainable solutions for commercial and institutional buildings, both public and private.” Source: RevenueBase Database · checked Sep 12, 2026
21	Fangary LAW Group	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 12, 2026
22	Archaeopaleo Resource Management, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	2 contacts →
	Indirect evidence “APRMI is committed to providing our clients with exceptional cultural and paleontological resource services.” Source: RevenueBase Database · checked Sep 12, 2026
23	Compliance Plus	Partial evidence	Los Angeles, United StatesHQ checked Sep 12, 2026	1-10	2 contacts →
	Partial evidence “Environmental compliance and regulatory policy support to industry.” Source: RevenueBase Database · checked Sep 12, 2026
24	Associated Consulting Civil & Environmental Services, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 12, 2026
25	Industrymc	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 12, 2026	11-50	1 contacts →
	Partial evidence “IndustryMC is a boutique Los Angeles-based management consulting firm that unlocks cost savings, efficiency gains and climate solutions for industrial facilities.” Source: RevenueBase Database · checked Sep 12, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: environmental consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names environmental consulting firms.
Partial evidence: Its own public description names part of environmental consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 65 environmental consulting firms based in Los Angeles, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 565 reachable decision-makers.

Free signup · no credit card

View the full list →

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

As of Sep 12, 2026

53.9%Verified-email coverage

52.4%Mobile-number coverage

16.1Average contacts per company

1-10Median size (employees)

204.6%Largest-city concentration · Houston

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

4660–30

9031–60

361–90

190–180

5180+

Company record updated

Median 75.0d

00–30

41531–60

48761–90

9890–180

48180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among environmental consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Los Angeles, United States whose own description of what they do matches “environmental consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names environmental consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among environmental consulting firms, and records with no verified work email. Companies headquartered outside Los Angeles are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 565 across the full list. 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 12, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Environmental consulting firms by metro in the United States

Environmental consulting firms in Houston133
Environmental consulting firms in New York117
Environmental consulting firms in Seattle80
Environmental consulting firms in Washington76
Environmental consulting firms in Portland70
Environmental consulting firms in Denver66
Environmental consulting firms in Los Angeles63

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names environmental consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

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

RevenueBase identified 65 environmental consulting firms headquartered in Los Angeles, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Psomas, headquartered in Los Angeles, tops this list with the largest team on record.

Which city has the most environmental consulting firms?

Houston leads with 133 headquartered companies, followed by New York (117) and Seattle (80).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 565 verified decision-maker contacts tracked across these 65 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 12, 2026.

Ready to reach these companies? Verified emails and direct dials for all 65 environmental consulting firms based in Los Angeles, United States. Start with a free account, no credit card.

Download this list →

Related lists

Environmental consulting firms by geography

Browse the directory

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 Smart Search, 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.