Company lists · Data refreshed September 2026

Top 25 Corporate sustainability consultants based in the United States

Name: Corporate sustainability consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 1,633 companies tracked

RevenueBase identified 1,633 corporate sustainability consultants headquartered in the United States as of September 2026 and tracks 15,315 professional contacts across them, including 4,877 with verified work emails. New York is the largest hub.

This list covers corporate sustainability consultants headquartered in the 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 19, 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 19, 2026 86% judged on-target in blind review

1,633Companies

15,315Contacts tracked

4,877Verified emails

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The 25 largest corporate sustainability consultants based in the United States

Ranked by team size

Top 25 of 1,633 corporate sustainability consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to corporate sustainability consultants: 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	Adec Innovations	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,304 contacts →
	Indirect evidence “ADEC Innovations seamlessly delivers fully integrated, cost-effective industry expertise, business process & data management, and software services.” Source: RevenueBase Database · checked Sep 19, 2026
2	OLA	Partial evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	n/a	1,145 contacts →
	Partial evidence “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Source: RevenueBase Database · checked Sep 19, 2026
3	Uniqus Consultech INC	Partial evidence	San Jose, CA, United StatesHQ checked Sep 19, 2026	501-1,000	675 contacts →
	Partial evidence “Uniqus Consultech is an AI and global tech-enabled consulting company that specializes in Accounting & Reporting Consulting, Governance, Risk & Compliance, Sustainability &…” Source: RevenueBase Database · checked Sep 19, 2026
4	Antea Group USA	Indirect evidence	St Paul, MN, United StatesHQ checked Sep 19, 2026	1,001-5,000	658 contacts →
	Indirect evidence “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: RevenueBase Database · checked Sep 19, 2026
5	TRIO	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 19, 2026	201-500	383 contacts →
	Indirect evidence “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Source: RevenueBase Database · checked Sep 19, 2026
6	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 19, 2026	201-500	375 contacts →
	Indirect evidence “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: RevenueBase Database · checked Sep 19, 2026
7	NUS Consulting Group	Indirect evidence	Park Ridge, NJ, United StatesHQ checked Sep 19, 2026	201-500	336 contacts →
	Indirect evidence “National Utility Service, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
8	Environmental Consulting & Technology, Inc. ECT	Partial evidence	Gainesville, FL, United StatesHQ checked Sep 19, 2026	201-500	305 contacts →
	Partial evidence “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Source: RevenueBase Database · checked Sep 19, 2026
9	Ecology And Environment, INC	Indirect evidence	Lancaster, NY, United StatesHQ checked Sep 19, 2026	5,001-10,000	278 contacts →
	Indirect evidence “E&E is now WSP USA.” Source: RevenueBase Database · checked Sep 19, 2026
10	Metiri Group	Indirect evidence	Clovis, CA, United StatesHQ checked Sep 19, 2026	n/a	233 contacts →
	Indirect evidence “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Source: RevenueBase Database · checked Sep 19, 2026
11	Keramida INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	51-200	152 contacts →
	Partial evidence “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Source: RevenueBase Database · checked Sep 19, 2026
12	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	Partial evidence	The Colony, TX, United StatesHQ checked Sep 19, 2026	51-200	147 contacts →
	Partial evidence “Quest Resource Management Group, a subsidiary of Quest Resource Holding Corporation (Nasdaq: QRHC), is a full-service environmental consulting and management company headquartered…” Source: RevenueBase Database · checked Sep 19, 2026
13	STOK	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	51-200	141 contacts →
	Indirect evidence “Stok leads organizations to decarbonize now.” Source: RevenueBase Database · checked Sep 19, 2026
14	Four Seasons Environmental, INC	Indirect evidence	Monroe, OH, United StatesHQ checked Sep 19, 2026	201-500	134 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
15	Onepointfive Opf.Degree	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	11-50	133 contacts →
	Partial evidence “At OnePointFive we solve your sustainability focused business challenges by empowering your organization with expert-led solutions, embedded training, and cutting edge tools to…” Source: RevenueBase Database · checked Sep 19, 2026
16	Cascadia Consulting Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	110 contacts →
	Partial evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 19, 2026
17	Techlaw	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 19, 2026	201-500	104 contacts →
	Indirect evidence “Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
18	Citadel EHS	Partial evidence	Glendale, CA, United StatesHQ checked Sep 19, 2026	51-200	102 contacts →
	Partial evidence “Founded in 1993, Citadel EHS provides comprehensive environmental, health, safety, and sustainability consulting solutions to meet the needs of both the public and private sectors.” Source: RevenueBase Database · checked Sep 19, 2026
19	AKT Peerless	Partial evidence	Saginaw, MI, United StatesHQ checked Sep 19, 2026	51-200	96 contacts →
	Partial evidence “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Source: RevenueBase Database · checked Sep 19, 2026
20	Climeco	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	96 contacts →
	Partial evidence “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: RevenueBase Database · checked Sep 19, 2026
21	Accountability	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	11-50	92 contacts →
	Indirect evidence “AccountAbility is a global advisory and standards firm that serves business, investors, governments, and multi-lateral organizations.” Source: RevenueBase Database · checked Sep 19, 2026
22	Verdani Partners	Strong evidence	Carlsbad, CA, United StatesHQ checked Sep 19, 2026	51-200	89 contacts →
	Strong evidence “Verdani Partners is a full service sustainability consulting firm specialized in corporate sustainability, LEED certification and greening and retrofitting existing buildings.” Source: RevenueBase Database · checked Sep 19, 2026
23	Earthcon Consultants, INC	Indirect evidence	Marietta, GA, United StatesHQ checked Sep 19, 2026	51-200	87 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
24	Malk Partners	Partial evidence	New York, NY, United StatesHQ checked Sep 19, 2026	51-200	84 contacts →
	Partial evidence “Malk Partners is the foremost consultancy advising private equity firms to create and protect value through environmental, social, and governance (ESG) management.” Source: RevenueBase Database · checked Sep 19, 2026
25	WAP Sustainability	Partial evidence	Chattanooga, United StatesHQ checked Sep 19, 2026	51-200	81 contacts →
	Partial evidence “From WAP Sustainability works with organizations as an outsourced sustainability service.” Source: RevenueBase Database · checked Sep 19, 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: corporate sustainability consultants. 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 corporate sustainability consultants.
Partial evidence: Its own public description names part of corporate sustainability consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name corporate sustainability consultants. 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 1,633 corporate sustainability consultants based in the United States

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Corporate sustainability consultants based in the United States at a glance

As of Sep 19, 2026

31.8%Verified-email coverage

9.4Average contacts per company

1-10Median size (employees)

7.0%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,303

11-50

260

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,633 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 corporate sustainability consultants, 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 the United States whose own description of what they do matches “corporate sustainability consultants”. 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 corporate sustainability consultants), 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 corporate sustainability consultants, and records with no verified work email. Companies headquartered outside United States 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, 4,877 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 19, 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.

Corporate sustainability consultants by metro

Corporate sustainability consultants in New York115
Corporate sustainability consultants in Chicago59
Corporate sustainability consultants in Los Angeles53
Corporate sustainability consultants in Washington50
Corporate sustainability consultants in San Francisco42
Corporate sustainability consultants in Seattle42
Corporate sustainability consultants in Atlanta37
Corporate sustainability consultants in Houston35
Corporate sustainability consultants in Miami34
Corporate sustainability consultants in Denver33

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 corporate sustainability consultants, 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 corporate sustainability consultants are there based in the United States?

RevenueBase identified 1,633 corporate sustainability consultants headquartered in the 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?

Adec Innovations, headquartered in Irvine, tops this list with the largest team on record.

Which city has the most corporate sustainability consultants?

New York leads with 115 headquartered companies, followed by Chicago (59) and Los Angeles (53).

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 4,877 verified decision-maker contacts tracked across these 1,633 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 19, 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.