Company lists · Data refreshed October 2026

Top 25 Environmental consultants energy companies based in the United States

Name: Environmental consultants energy companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 5,995 companies tracked

RevenueBase identified 5,995 company matches for environmental consultants energy companies associated with the United States as of October 2026 and tracks 189,560 professional contacts across them, including 85,096 with verified work emails. Houston is the largest hub.

This list covers company matches for environmental consultants energy companies 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 October 12, 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 Oct 12, 2026 How this list was built

5,995Companies

189,560Contacts tracked

85,096Verified emails

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The 25 largest environmental consultants energy companies based in the United States

Ranked by team size

Top 25 of 5,995 company matches for environmental consultants energy companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 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	Tetra Tech	Exact match	Pasadena, CA, United StatesHQ recorded Oct 12, 2026	10001+	13,725 contacts →
	Exact match “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
2	WSP In The U.S	Exact match	New York, NY, United StatesHQ recorded Oct 12, 2026	10001+	10,184 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 · Oct 12, 2026 · View company records in RevenueBase
3	APTIM	Exact match	Baton Rouge, LA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,692 contacts →
	Exact match “APTIM enhances the quality of the environment, wellbeing of people, resilience of communities, and opportunity for employees to make a difference, not just a living.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
4	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,521 contacts →
	Exact match “Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
5	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,510 contacts →
	Exact match “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
6	Langan Engineering & Environmental Services	Exact match	Parsippany, NJ, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,402 contacts →
	Exact match “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
7	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,293 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	Providence	Exact match	Baton Rouge, LA, United StatesHQ recorded Oct 12, 2026	n/a	2,256 contacts →
	Exact match “Providence is an employee-owned engineering and environmental consulting firm.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
9	Hazen And Sawyer	Exact match	New York, NY, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,251 contacts →
	Exact match “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,206 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	Civil & Environmental Consultants, INC	Exact match	Moon Township, PA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,204 contacts →
	Exact match “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	LJA	Exact match	Houston, TX, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,148 contacts →
	Exact match “Employee-Owned.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	IMEG	Exact match	Rock Island, IL, United StatesHQ recorded Oct 12, 2026	1,001-5,000	2,064 contacts →
	Exact match “Leaders in Engineering and Innovation.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
14	Enercon Services, INC	Exact match	Kennesaw, GA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,980 contacts →
	Exact match “ENERCON is a multi-discipline engineering and environmental engineering support services firm focused on delivering safe and efficient solutions for the power, data center and…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Swca Environmental Consultants	Exact match	Phoenix, AZ, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,661 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 · Oct 12, 2026 · View company records in RevenueBase
16	GEI Consultants, INC	Exact match	Woburn, MA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,639 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
17	Exponent	Exact match	Menlo Park, CA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,628 contacts →
	Exact match “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
18	Weston Solutions, INC	Exact match	West Chester, PA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,525 contacts →
	Exact match “Weston Solutions, Inc.(Weston) is a 100% employee-owned environmental and infrastructure services firm committed to safety and providing measurable client value.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
19	Adec Innovations	Exact match	Irvine, CA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,508 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 · Oct 12, 2026 · View company records in RevenueBase
20	Partner Engineering & Science, INC	Exact match	Torrance, CA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,418 contacts →
	Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	Sphera	Exact match	Chicago, IL, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,367 contacts →
	Exact match “Sphera helps companies understand and manage risk across their operations, products and supply chains by bringing safety, sustainability and performance data into one clear…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
22	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,326 contacts →
	Exact match “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
23	Apex Companies	Exact match	Rockville, MD, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,266 contacts →
	Exact match “Who is Apex?” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
24	Verdantas	Exact match	Tampa, FL, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,252 contacts →
	Exact match “At Verdantas, we blend engineering and environmental science together with advanced technology and world-renowned labs to create solutions with the big picture in mind.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
25	Triumvirate Environmental	Exact match	Somerville, MA, United StatesHQ recorded Oct 12, 2026	1,001-5,000	1,120 contacts →
	Exact match “Triumvirate Environmental provides sustainable environmental solutions to leading companies in the Life Sciences, Healthcare, Education, and Advanced Manufacturing markets.” Recorded in the RevenueBase company graph · Oct 12, 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 “environmental consultants energy 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 5,995 environmental consultants energy companies based in the United States

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Environmental consultants energy companies based in the United States at a glance

As of Oct 12, 2026

44.9%Verified-email coverage

31.6Average contacts per company

1-10Median size (employees)

4.3%Largest-city concentration · Houston

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

3,386

11-50

1,842

51-200

524

201-500

126

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 5,995 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 “environmental consultants energy 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 85,096 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 October 12, 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.

Environmental consultants energy companies 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 “environmental consultants energy companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental consultants energy companies are there based in the United States?

RevenueBase identified 5,995 company matches for environmental consultants energy companies associated with the United States as of October 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?

Tetra Tech tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most environmental consultants energy companies?

Houston leads with 259 company records, followed by New York (153) and Denver (85).

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 85,096 professional contacts with verified work emails tracked across these 5,995 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 October 12, 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.