Company lists · Data refreshed September 2026

Top 25 Sustainable development consultancies based in the United States

Name: Sustainable development consultancies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 2,030 companies tracked

RevenueBase identified 2,030 company matches for sustainable development consultancies associated with the United States as of September 2026 and tracks 30,506 professional contacts across them, including 13,992 with verified work emails. New York is the largest hub.

This list covers company matches for sustainable development consultancies 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 29, 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 29, 2026 How this list was built

2,030Companies

30,506Contacts tracked

13,992Verified emails

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The 25 largest sustainable development consultancies based in the United States

Ranked by team size

Top 25 of 2,030 company matches for sustainable development consultancies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 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 29, 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 29, 2026 · View company records in RevenueBase
2	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
3	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
4	Environmental Science Associates	Exact match	San Francisco, CA, United StatesHQ recorded Sep 29, 2026	501-1,000	732 contacts →
	Exact match “ESA is a 100% employee-owned environmental consulting firm.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	Antea Group USA	Exact match	St. Paul, MN, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
6	EBI Consulting	Exact match	Burlington, MA, United StatesHQ recorded Sep 29, 2026	501-1,000	535 contacts →
	Exact match “For 35 years we have been helping investors, lenders, owners, developers, contractors, and property managers reduce risk and optimize their built facilities, infrastructure and…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
7	Synergy Consulting, INC	Exact match	Washington, DC, United StatesHQ recorded Sep 29, 2026	51-200	434 contacts →
	Exact match “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	TRIO	Exact match	Irvine, CA, United StatesHQ recorded Sep 29, 2026	201-500	383 contacts →
	Exact match “We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	NUS Consulting Group	Exact match	Park Ridge, NJ, United StatesHQ recorded Sep 29, 2026	201-500	336 contacts →
	Exact match “National Utility Service, Inc.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
10	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
11	Csrs, A Westwood Company	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
12	Illumine-I	Exact match	Austin, CA, United StatesHQ recorded Sep 29, 2026	201-500	275 contacts →
	Exact match “The world runs on power.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13	Nova Group, GBC	Exact match	St. Louis Park, MN, United StatesHQ recorded Sep 29, 2026	201-500	264 contacts →
	Exact match “Nova Group, GBC is an international, multidisciplinary advising firm providing environmental, engineering and energy services throughout North America and around the globe.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	PSC Consulting	Exact match	Kirkland, WA, United StatesHQ recorded Sep 29, 2026	201-500	254 contacts →
	Exact match “We provide global renewable energy consulting services, focused on empowering clients to navigate the complexities of the energy transition.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	Kleinschmidt Associates	Exact match	Pittsfield, ME, United StatesHQ recorded Sep 29, 2026	201-500	218 contacts →
	Exact match “At Kleinschmidt, we work primarily with energy companies and government agencies in North America to protect and enhance the environment without compromising performance.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
17	Nexant	Exact match	Half Moon Bay, CA, United StatesHQ recorded Sep 29, 2026	201-500	183 contacts →
	Exact match “Resource Innovations now combined with Nexant is a substantially woman-owned, woman-led energy consulting firm dedicated to creating equal access to clean resources through…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	HJI Group Corporation	Exact match	Costa Mesa, CA, United StatesHQ recorded Sep 29, 2026	51-200	165 contacts →
	Exact match “HJI Group serves the global community.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	Keramida INC	Exact match	Indianapolis, IN, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
20	STOK	Exact match	San Francisco, CA, United StatesHQ recorded Sep 29, 2026	51-200	141 contacts →
	Exact match “Stok leads organizations to decarbonize now.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	Hoyle, Tanner & Associates, INC	Exact match	Manchester, NH, United StatesHQ recorded Sep 29, 2026	51-200	137 contacts →
	Exact match “Hoyle Tanner provides our clients with integrated engineering designs that utilize sustainable and low impact development principles through innovative strategies and technologies.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Four Seasons Environmental, INC	Exact match	Monroe, OH, United StatesHQ recorded Sep 29, 2026	201-500	134 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	Onepointfive Opf.Degree	Exact match	New York, NY, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
24	Cascadia Consulting Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
25	Techlaw	Exact match	Chantilly, VA, United StatesHQ recorded Sep 29, 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 29, 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 development consultancies”. 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 2,030 sustainable development consultancies based in the United States

See the full list, filter by size, metro and specialty, and access 13,992 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Sustainable development consultancies based in the United States at a glance

As of Sep 29, 2026

45.9%Verified-email coverage

15.0Average contacts per company

1-10Median size (employees)

6.6%Largest-city concentration · New York

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

1,516

11-50

391

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 2,030 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 the United States whose business descriptions match “sustainable development consultancies” 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 13,992 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 29, 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 development consultancies 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 development consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many sustainable development consultancies are there based in the United States?

RevenueBase identified 2,030 company matches for sustainable development consultancies 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 development consultancies?

New York leads with 133 company records, followed by Washington (79) and Chicago (60).

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 13,992 professional contacts with verified work emails tracked across these 2,030 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 29, 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.