Company lists · Data refreshed September 2026

Top 25 Ecosystem impact assessors based in the United States

Name: Ecosystem impact assessors 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 620 companies tracked

RevenueBase identified 620 ecosystem impact assessors headquartered in the United States as of September 2026 and tracks 12,855 professional contacts across them, including 6,836 with verified work emails. Houston is the largest hub.

This list covers ecosystem impact assessors 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

620Companies

12,855Contacts tracked

6,836Verified emails

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The 25 largest ecosystem impact assessors based in the United States

Ranked by team size

Top 25 of 620 ecosystem impact assessors 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 ecosystem impact assessors: 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	Swca Environmental Consultants	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,629 contacts →
	Indirect evidence “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: RevenueBase Database · checked Sep 19, 2026
2	Environmental Science Associates	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	501-1,000	732 contacts →
	Indirect evidence “ESA is a 100% employee-owned environmental consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
3	EBI Consulting	Indirect evidence	Burlington, MA, United StatesHQ checked Sep 19, 2026	501-1,000	535 contacts →
	Indirect evidence “For 35 years we have been helping investors, lenders, owners, developers, contractors, and property managers reduce risk and optimize their built facilities, infrastructure and…” Source: RevenueBase Database · checked Sep 19, 2026
4	Rincon Consultants	Indirect evidence	Ventura, CA, United StatesHQ checked Sep 19, 2026	501-1,000	479 contacts →
	Indirect evidence “Rincon Consultants is a multi-disciplinary environmental sciences, planning, and engineering consulting firm that provides quality professional services to government and industry.” Source: RevenueBase Database · checked Sep 19, 2026
5	Groundwater & Environmental Services, INC	Indirect evidence	Wall Township, NJ, United StatesHQ checked Sep 19, 2026	201-500	447 contacts →
	Indirect evidence “We are Groundwater & Environmental Services, Inc, better known as GES.” Source: RevenueBase Database · checked Sep 19, 2026
6	AEI Consultants	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 19, 2026	201-500	433 contacts →
	Indirect evidence “AEI Consultants provides building, environmental, land and sustainability assessment and consulting services throughout North America.” Source: RevenueBase Database · checked Sep 19, 2026
7	Western Ecosystems Technology, Inc. West	Indirect evidence	Cheyenne, WY, United StatesHQ checked Sep 19, 2026	201-500	408 contacts →
	Indirect evidence “WEST provides environmental and statistical consulting services and contract research nationally and internationally to industry, government, and private organizations.” Source: RevenueBase Database · checked Sep 19, 2026
8	Environmental Consulting & Technology, Inc. ECT	Indirect evidence	Gainesville, FL, United StatesHQ checked Sep 19, 2026	201-500	305 contacts →
	Indirect 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	GSI Environmental INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	259 contacts →
	Indirect evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 19, 2026
10	Normandeau Associates, INC	Indirect evidence	Bedford, NH, United StatesHQ checked Sep 19, 2026	201-500	189 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
11	Wra, INC	Partial evidence	San Rafael, CA, United StatesHQ checked Sep 19, 2026	51-200	183 contacts →
	Partial evidence “WRA is an environmental consultancy that’s making a net positive impact.” Source: RevenueBase Database · checked Sep 19, 2026
12	Ecorp Consulting, INC	Indirect evidence	Rocklin, CA, United StatesHQ checked Sep 19, 2026	51-200	166 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
13	Industrial Economics, Incorporated IEC	Indirect evidence	Cambridge, MA, United StatesHQ checked Sep 19, 2026	51-200	163 contacts →
	Indirect evidence “IEc is an environmental consulting firm with four decades of experience providing consulting services to a diverse client base.” Source: RevenueBase Database · checked Sep 19, 2026
14	Keramida INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	51-200	152 contacts →
	Indirect 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
15	Cascadia Consulting Group	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	110 contacts →
	Indirect evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 19, 2026
16	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
17	Perennial Environmental Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	102 contacts →
	Indirect evidence “Perennial Environmental Services, LLC, has been providing technical environmental solutions and management with fresh perspectives and unparalleled efficiency since 2003.” Source: RevenueBase Database · checked Sep 19, 2026
18	EEE Consulting, Inc. 3e	Indirect evidence	Mechanicsville, VA, United StatesHQ checked Sep 19, 2026	11-50	101 contacts →
	Indirect evidence “Consulting, Inc.(3e) is a dynamic and progressive certified small business that specializes in environmental studies, environmental engineering, environmental education, and…” Source: RevenueBase Database · checked Sep 19, 2026
19	Straughan Environmental, INC	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 19, 2026	51-200	99 contacts →
	Indirect evidence “Straughan Environmental provides high quality & sustainable environmental planning, permitting and design services to government (federal, state, and municipal) and commercial…” Source: RevenueBase Database · checked Sep 19, 2026
20	AKT Peerless	Indirect evidence	Saginaw, MI, United StatesHQ checked Sep 19, 2026	51-200	96 contacts →
	Indirect evidence “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Source: RevenueBase Database · checked Sep 19, 2026
21	Aspen Environmental Group	Partial evidence	Agoura Hills, CA, United StatesHQ checked Sep 19, 2026	51-200	94 contacts →
	Partial evidence “Aspen Environmental Group is an expert interdisciplinary environmental impact analysis firm, specializing in the management of environmental assessment efforts under CEQA, NEPA…” Source: RevenueBase Database · checked Sep 19, 2026
22	Edwards-Pitman Environmental, INC	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	51-200	88 contacts →
	Indirect evidence “Incorporated in 1994, Edwards-Pitman Environmental, Inc.” 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	Environmental Services, Inc., A Terracon Company	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 19, 2026	51-200	70 contacts →
	Indirect evidence “Environmental Services, Inc.(ESI) is a leading full service environmental consulting firm with national and international experience.” Source: RevenueBase Database · checked Sep 19, 2026
25	H. T. Harvey & Associates	Indirect evidence	Los Gatos, CA, United StatesHQ checked Sep 19, 2026	51-200	69 contacts →
	Indirect evidence “Since 1970, the highly-trained ecologists and professionals at H.” 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: ecosystem impact assessors. 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 ecosystem impact assessors.
Partial evidence: Its own public description names part of ecosystem impact assessors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ecosystem impact assessors. 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 620 ecosystem impact assessors based in the United States

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Ecosystem impact assessors based in the United States at a glance

As of Sep 19, 2026

53.2%Verified-email coverage

20.7Average contacts per company

1-10Median size (employees)

2.3%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

349

11-50

208

51-200

201-500

501-1,000

1,001-5,000

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 620 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 ecosystem impact assessors, 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 “ecosystem impact assessors”. 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 ecosystem impact assessors), 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 ecosystem impact assessors, 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, 6,836 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.

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 ecosystem impact assessors, 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 ecosystem impact assessors are there based in the United States?

RevenueBase identified 620 ecosystem impact assessors 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?

Swca Environmental Consultants, headquartered in Phoenix, tops this list with the largest team on record.

Which city has the most ecosystem impact assessors?

Houston leads with 14 headquartered companies, followed by Austin (7) and New York (7).

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 6,836 verified decision-maker contacts tracked across these 620 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.