Company lists · Data refreshed September 2026

Top 25 Sustainability consulting companies based in Chicago, United States

Name: Sustainability consulting companies based in Chicago, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 81 companies tracked

RevenueBase identified 81 company matches for sustainability consulting companies associated with Chicago, United States as of September 2026 and tracks 681 professional contacts across them, including 216 with verified work emails. Across the United States, New York is the largest hub for this category (161 companies); Chicago has 81.

This list covers company matches for sustainability consulting companies associated with Chicago, 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 22, 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 22, 2026 How this list was built

81Companies

681Contacts tracked

216Verified emails

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The 25 largest sustainability consulting companies based in Chicago, United States

Ranked by team size

Top 25 of 81 company matches for sustainability consulting companies based in Chicago, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 22, 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	SUMAC	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	51-200	183 contacts →
	Exact match “SUMAC is an architecture, engineering, and consulting firm that promotes sustainability as the key element to increasing the profitability of our clients and partners.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
2	WRD Environmental	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	64 contacts →
	Exact match “WRD Environmental helps organizations committed to sustainability realize their vision.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
3	Aeterra, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	43 contacts →
	Exact match “Aeterra is a full-service environmental and sustainability consulting firm that provides operating businesses and their owners with meaningful, practical, business-focused advice.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
4	Carbon Solutions Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	42 contacts →
	Exact match “Carbon Solutions Group was founded in Chicago, Illinois, in 2006.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
5	Center For Sustainability And Excellence - CSE	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	34 contacts →
	Exact match “The Center for Sustainability and Excellence (CSE) is a global leader in ESG consulting, Net Zero strategy, and Circular Economy solutions.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
6	National Retrofitting Group, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	30 contacts →
	Exact match “National Retrofitting Group provides sustainability consulting along with a variety of energy retrofitting services to help our customers save money on their energy bills while…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
7	Aero Performance Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	28 contacts →
	Exact match “We collaborate with you to develop a comprehensive facility optimization program, blending our engineering expertise with practical field experience and advanced technology.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
8	Carlson Environmental, A Nova Group, GBC Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	17 contacts →
	Exact match “Carlson Environmental, a Nova Group, GBC Company, was originally founded in 1988 by Dr.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
9	360 Energy Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	16 contacts →
	Exact match “360 Energy Group is an energy consulting firm that provides comprehensive energy solutions to the public and private sectors in the United States and worldwide, including energy…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
10	ECO Achievers	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	14 contacts →
	Exact match “Eco Achievers helps property owners smartly transform their buildings into healthy, resilient and efficient places.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
11	Strategic Growth Consulting, INC	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	13 contacts →
	Exact match “Strategic Growth Consulting helps small to medium sized professional service companies identify, plan and execute growth strategies bringing over 30 years of experience in the…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
12	Captios Partners	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	12 contacts →
	Exact match “Captios Partners is a professional services and engineering consultancy dedicated to bringing global resources and businesses together to create quality product strategies…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
13	Husarch	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	9 contacts →
	Exact match “HUSARCH collaborates with architectural, energy, and construction industry leaders to develop actionable, data driven solutions.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
14	Ampliqore	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	8 contacts →
	Exact match “As a global full-service sustainability agency, we help organisations stay eligible for markets, capital, and regulation by turning sustainability into a source of resilience…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
15	Inova Energy Group	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	7 contacts →
	Exact match “Inova Energy Group is a certified WBE offering management consulting, strategic planning, and project delivery solutions in the areas of energy and sustainability.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
16	The Astor Company	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	7 contacts →
	Exact match “The Astor Company opened its doors almost 20 years ago as a cardboard recycling company, beginning a journey of continuous adaptation and evolution which today finds a world-class…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
17	BGP Advisory	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	6 contacts →
	Exact match “Operators supporting operators.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
18	Climate Resilience Consulting	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	5 contacts →
	Exact match “Celebrating 10 years of service in 2026, Climate Resilience Consulting helps states, cities and small businesses turn climate risk into resilience.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
19	Kairos Worldwide	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	5 contacts →
	Exact match “Kairos Worldwide is a proven leader in process engineering consulting and is dedicated to reducing waste and enabling robust, sustainable growth for all types of clients.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
20	E4, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	5 contacts →
	Exact match “E4 LLC is a trusted advisor to C&I and municipal clients navigating the evolving clean energy landscape.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
21	Environmental Group Services Limited Egsl	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	4 contacts →
	Exact match “Environmental Group Services, Ltd.(EGSL) is a full service environmental engineering, training and consulting company located in Chicago, Illinois.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
22	Greenleaf Advisors, LLC	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	3 contacts →
	Exact match “Greenleaf Advisors is a consulting and transaction-services firm that builds sustainable enterprises and communities by bridging them to the resources and strategies they need to…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
23	Kathleen Wood Partners	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	11-50	3 contacts →
	Exact match “Awarded Inc's 2022 and 2023 #PowerPartner Award!” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
24	ESG OWL	Exact match	Chicago, IL, United StatesHQ recorded Sep 22, 2026	1-10	3 contacts →
	Exact match “Fractional Sustainability for Manufacturing.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
25	C2impact	Exact match	Chicago, United StatesHQ recorded Sep 22, 2026	1-10	2 contacts →
	Exact match “Better doesn’t automatically get bought and used.” Recorded in the RevenueBase company graph · Sep 22, 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 “sustainability consulting companies”. 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 25 of 81 sustainability consulting companies based in Chicago, United States

See the full list, filter by size, metro and specialty, and access 216 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainability consulting companies based in Chicago, United States at a glance

As of Sep 22, 2026

31.7%Verified-email coverage

8.4Average contacts per company

1-10Median size (employees)

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Chicago, so it is reported there. Company counts and contact totals on this page are exact for Chicago, over 81 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 Chicago, United States whose business descriptions match “sustainability consulting companies” 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 216 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 22, 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.

Sustainability consulting companies 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 “sustainability consulting companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainability consulting companies are there based in Chicago, United States?

RevenueBase identified 81 company matches for sustainability consulting companies associated with Chicago, 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?

SUMAC 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 sustainability consulting companies?

New York leads the United States with 161 company records, followed by Houston (84) and Chicago (81).

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 216 professional contacts with verified work emails tracked across these 81 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 22, 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.