Company lists · Data refreshed September 2026

Top 25 Sustainable IT consulting firms based in the United States

Name: Sustainable IT consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 1,828 companies tracked

RevenueBase identified 1,828 company matches for sustainable IT consulting firms associated with the United States as of September 2026 and tracks 28,479 professional contacts across them, including 12,970 with verified work emails and 11,437 with mobile numbers. New York is the largest hub.

This list covers company matches for sustainable IT consulting firms associated with the 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 6, 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 6, 2026 How this list was built

1,828Companies

28,479Contacts tracked

12,970Verified emails

11,437Mobile numbers

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The 25 largest sustainable IT consulting firms based in the United States

Ranked by team size

Top 25 of 1,828 company matches for sustainable IT consulting firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 6, 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	WSP In The U.S	Exact match	New York, NY, United StatesHQ recorded Sep 6, 2026	10001+	9,318 contacts →
	Exact match “What if you could shape built and natural environments – and the future of those that use them?” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
2	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 6, 2026	1,001-5,000	1,629 contacts →
	Exact match “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
3	Adec Innovations	Exact match	Irvine, CA, United StatesHQ recorded Sep 6, 2026	1,001-5,000	1,304 contacts →
	Exact match “ADEC Innovations seamlessly delivers fully integrated, cost-effective industry expertise, business process & data management, and software services.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
4	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 6, 2026	n/a	1,145 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
5	The Cadmus Group	Exact match	Arlington, OR, United StatesHQ recorded Sep 6, 2026	1,001-5,000	700 contacts →
	Exact match “Cadmus is a technology-empowered global strategic consulting firm that helps clients achieve their goals through transformative digital solutions and expertise across domains.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
6	Uniqus Consultech INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 6, 2026	501-1,000	675 contacts →
	Exact match “Uniqus Consultech is an AI and global tech-enabled consulting company that specializes in Accounting & Reporting Consulting, Governance, Risk & Compliance, Sustainability &…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
7	Antea Group USA	Exact match	St. Paul, MN, United StatesHQ recorded Sep 6, 2026	1,001-5,000	658 contacts →
	Exact match “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
8	P2s	Exact match	Long Beach, CA, United StatesHQ recorded Sep 6, 2026	201-500	375 contacts →
	Exact match “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
9	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 6, 2026	201-500	305 contacts →
	Exact match “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
10	Csrs, A Westwood Company	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 6, 2026	51-200	305 contacts →
	Exact match “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
11	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Sep 6, 2026	201-500	288 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
12	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Sep 6, 2026	201-500	214 contacts →
	Exact match “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
13	Delaware North America	Exact match	Dallas, TX, United StatesHQ recorded Sep 6, 2026	5,001-10,000	213 contacts →
	Exact match “delaware is a fast-growing, global company that delivers advanced solutions and services to organizations striving for a sustainable, competitive advantage.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
14	Plateau GRP	Exact match	Fairfax, VA, United StatesHQ recorded Sep 6, 2026	51-200	192 contacts →
	Exact match “Plateau Grp provides innovative and agile IT solutions to customer challenges.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
15	SUMAC	Exact match	Chicago, IL, United StatesHQ recorded Sep 6, 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 6, 2026 · View company records in RevenueBase
16	Keramida INC	Exact match	Indianapolis, IN, United StatesHQ recorded Sep 6, 2026	51-200	152 contacts →
	Exact match “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
17	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	Exact match	The Colony, TX, United StatesHQ recorded Sep 6, 2026	51-200	147 contacts →
	Exact match “Quest Resource Management Group, a subsidiary of Quest Resource Holding Corporation (Nasdaq: QRHC), is a full-service environmental consulting and management company headquartered…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
18	STOK	Exact match	San Francisco, CA, United StatesHQ recorded Sep 6, 2026	51-200	141 contacts →
	Exact match “Stok leads organizations to decarbonize now.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
19	Four Seasons Environmental, INC	Exact match	Monroe, OH, United StatesHQ recorded Sep 6, 2026	201-500	134 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
20	Onepointfive Opf.Degree	Exact match	New York, NY, United StatesHQ recorded Sep 6, 2026	11-50	133 contacts →
	Exact match “At OnePointFive we solve your sustainability focused business challenges by empowering your organization with expert-led solutions, embedded training, and cutting edge tools to…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
21	Hastings	Exact match	Nashville, TN, United StatesHQ recorded Sep 6, 2026	51-200	126 contacts →
	Exact match “Since our founding in 1985, HASTINGS has been deeply committed to design and community, producing award-winning sustainable design that positively impacts our clients and the…” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
22	Cascadia Consulting Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 6, 2026	51-200	110 contacts →
	Exact match “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
23	Techlaw	Exact match	Chantilly, VA, United StatesHQ recorded Sep 6, 2026	201-500	104 contacts →
	Exact match “Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
24	Citadel EHS	Exact match	Glendale, CA, United StatesHQ recorded Sep 6, 2026	51-200	102 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 6, 2026 · View company records in RevenueBase
25	Environ Energy	Exact match	New York, NY, United StatesHQ recorded Sep 6, 2026	51-200	98 contacts →
	Exact match “Environ Energy is a leader in accelerating global sustainable energy transformation for more than 30 years.” Recorded in the RevenueBase company graph · Sep 6, 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 “sustainable IT consulting 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 25 of 1,828 sustainable IT consulting firms based in the United States

See the full list, filter by size, metro and specialty, and access 12,970 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainable IT consulting firms based in the United States at a glance

As of Sep 6, 2026

45.5%Verified-email coverage

40.2%Mobile-number coverage

15.6Average contacts per company

1-10Median size (employees)

6.5%Largest-city concentration · New York

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

1,363

11-50

342

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

11,9360–30

88531–60

261–90

390–180

144180+

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 the United States whose business descriptions match “sustainable IT consulting 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 12,970 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 6, 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.

Sustainable IT consulting firms by metro

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 “sustainable IT consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable IT consulting firms are there based in the United States?

RevenueBase identified 1,828 company matches for sustainable IT consulting firms associated with the 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?

WSP In The U.S tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most sustainable IT consulting firms?

New York leads with 119 company records, followed by Chicago (54) and Washington (50).

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 12,970 professional contacts with verified work emails tracked across these 1,828 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 6, 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.