Company lists · Data refreshed September 2026

Top 25 Compliance and environmental consulting firms based in Los Angeles, United States

Name: Compliance and 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 27, 2026 76 companies tracked

RevenueBase identified 76 compliance and environmental consulting firms headquartered in Los Angeles, United States as of September 2026 and tracks 1,242 professional contacts across them, including 630 with verified work emails. Across the United States, Houston is the largest hub for this category (188 companies); Los Angeles has 76.

This list covers compliance and 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 27, 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 27, 2026 86% judged on-target in blind review

76Companies

1,242Contacts tracked

630Verified emails

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

Ranked by team size

Top 25 of 76 compliance and environmental consulting firms based in Los Angeles, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to compliance and 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 27, 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 27, 2026
2	Partner Energy	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	51-200	57 contacts →
	Indirect evidence “Partner Energy, Inc.” Source: RevenueBase Database · checked Sep 27, 2026
3	Gnarus Advisors LLC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
4	Verdical Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	11-50	29 contacts →
	Partial evidence “Established in 2012, Verdical Group has developed a nationally known brand and industry leading reputation as a sustainability consulting firm focused on decarbonizing the built…” Source: RevenueBase Database · checked Sep 27, 2026
5	Terra-Petra	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
6	Watearth	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	11-50	22 contacts →
	Indirect evidence “Watearth, Inc.” Source: RevenueBase Database · checked Sep 27, 2026
7	Impact Sciences	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
8	Leading Edge	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	11-50	17 contacts →
	Indirect evidence “Leading Edge is a California based sustainability consultancy.” Source: RevenueBase Database · checked Sep 27, 2026
9	Reliance Safety Consultants, INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
10	Ecomotion	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
11	Socal Stormwater Runoff Solution Services INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	1-10	10 contacts →
	Indirect evidence “In SSRSS we provide you with the designed specifically to address the permit requirements related to your construction job site.” Source: RevenueBase Database · checked Sep 27, 2026
12	Compliagent	Partial evidence	Los Angeles, United StatesHQ checked Sep 27, 2026	11-50	9 contacts →
	Partial evidence “Compliagent is a Los Angeles‐based regulatory consulting firm serving healthcare providers nationally.” Source: RevenueBase Database · checked Sep 27, 2026
13	Kroner Environmental Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
14	California Construction Compliance	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	11-50	8 contacts →
	Indirect evidence “Policy, investment and cause have aligned.” Source: RevenueBase Database · checked Sep 27, 2026
15	Argento Graham	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
16	Bespoke ESG	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	1-10	6 contacts →
	Indirect evidence “Bespoke ESG gets companies through the sustainability work that has a deadline.” Source: RevenueBase Database · checked Sep 27, 2026
17	Ethowork Consulting, LLC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	1-10	6 contacts →
	Indirect evidence “Thank you for visiting our page.” Source: RevenueBase Database · checked Sep 27, 2026
18	ZILA	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
19	The Phylmar Group, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	1-10	5 contacts →
	Indirect evidence “By integrating best-in-class industry information and analysis with regulatory advocacy and a peer networking forum combined with access to top-tier consultants located throughout…” Source: RevenueBase Database · checked Sep 27, 2026
20	Labeling Sustainability INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
21	Earthara	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
22	Lucy Environmental Services Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 2026	51-200	4 contacts →
	Partial evidence “Our team at Lucy Environmental Services Group has 60 plus years of OSRO experience, coupled with decades of Asbestos and Lead abatement, we are the team of highly trained…” Source: RevenueBase Database · checked Sep 27, 2026
23	Andersen Integrated Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
24	Insight Energy Consulting	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 2026
25	Harris Consulting Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 27, 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 27, 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: compliance and 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 compliance and environmental consulting firms.
Partial evidence: Its own public description names part of compliance and 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 compliance and 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 76 compliance and environmental consulting firms based in Los Angeles, United States

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Compliance and environmental consulting firms based in Los Angeles, United States at a glance

As of Sep 27, 2026

50.7%Verified-email coverage

16.3Average contacts per company

1-10Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

5,001-10,000

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 76 companies.

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 compliance and 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 “compliance and 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 compliance and 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 compliance and 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, 630 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 27, 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.

Compliance and environmental consulting firms by metro in the United States

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 compliance and 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 compliance and environmental consulting firms are there based in Los Angeles, United States?

RevenueBase identified 76 compliance and 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 in the United States has the most compliance and environmental consulting firms?

Houston leads the United States with 188 headquartered companies, followed by New York (163) and Denver (84). Los Angeles has 76.

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 630 verified decision-maker contacts tracked across these 76 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 27, 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 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.