Company lists · Data refreshed September 2026

Top 25 Ecological survey companies based in the United States

Name: Ecological survey companies 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 604 companies tracked

RevenueBase identified 604 ecological survey companies headquartered in the United States as of September 2026 and tracks 9,100 professional contacts across them, including 4,728 with verified work emails. Fort Collins is the largest hub.

This list covers ecological survey companies 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

604Companies

9,100Contacts tracked

4,728Verified emails

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The 25 largest ecological survey companies based in the United States

Ranked by team size

Top 25 of 604 ecological survey companies 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 ecological survey companies: 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	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
2	Anchor QEA	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	479 contacts →
	Indirect evidence “Headquartered in Seattle, Washington, Anchor QEA is a nationally recognized environmental science and engineering consulting firm specializing in aquatic, shoreline, and water…” Source: RevenueBase Database · checked Sep 19, 2026
3	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
4	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
5	Environmental Works, INC	Indirect evidence	Springfield, MO, United StatesHQ checked Sep 19, 2026	201-500	238 contacts →
	Indirect evidence “Environmental Works, Inc.(EWI) offers truly comprehensive environmental solutions for a variety of industries, businesses, and municipalities.” Source: RevenueBase Database · checked Sep 19, 2026
6	Enviroscience, INC	Indirect evidence	Stow, OH, United StatesHQ checked Sep 19, 2026	51-200	176 contacts →
	Indirect evidence “EnviroScience is a team of over 150 expert biologists, commercial divers, environmental engineers, and environmental scientists that provides biomonitoring, environmental…” Source: RevenueBase Database · checked Sep 19, 2026
7	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
8	Clymer Farner Barley	Indirect evidence	Middleton, FL, United StatesHQ checked Sep 19, 2026	201-500	136 contacts →
	Indirect evidence “Clymer Farner Barley, Inc.(CFB Inc) is a multi-disciplinary AEC firm providing civil engineering, environmental sciences, landscape architecture, GIS & mapping, and consulting…” Source: RevenueBase Database · checked Sep 19, 2026
9	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
10	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
11	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
12	Aspen Environmental Group	Indirect evidence	Agoura Hills, CA, United StatesHQ checked Sep 19, 2026	51-200	94 contacts →
	Indirect 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
13	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
14	Recon Environmental, INC	Partial evidence	San Diego, CA, United StatesHQ checked Sep 19, 2026	51-200	84 contacts →
	Partial evidence “Environmental consulting • Ecological restoration • 50+ years of service • 100% employee-owned” Source: RevenueBase Database · checked Sep 19, 2026
15	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
16	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
17	Bio-Tech Consulting	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 19, 2026	51-200	68 contacts →
	Indirect evidence “Based in Orlando, Florida, Bio-Tech Consulting (BTC) is a full-service environmental consulting firm with clients throughout Florida and the southeast.” Source: RevenueBase Database · checked Sep 19, 2026
18	Summitwest Environmental, INC	Indirect evidence	Bend, OR, United StatesHQ checked Sep 19, 2026	51-200	65 contacts →
	Indirect evidence “SummitWest is an environmental consulting company that is home to a team of dynamic, solution-oriented thinkers.” Source: RevenueBase Database · checked Sep 19, 2026
19	Environmental Intelligence, LLC A Montrose Environmental Group Company	Indirect evidence	Laguna Beach, CA, United StatesHQ checked Sep 19, 2026	51-200	64 contacts →
	Indirect evidence “Environmental Intelligence, LLC (EI) is a full service environmental consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
20	Applied Ecological Services	Partial evidence	Brodhead, WI, United StatesHQ checked Sep 19, 2026	501-1,000	61 contacts →
	Partial evidence “Applied Ecological Services was acquired by RES in 2021.” Source: RevenueBase Database · checked Sep 19, 2026
21	Rescom Environmental Corp	Indirect evidence	Petoskey, MI, United StatesHQ checked Sep 19, 2026	11-50	60 contacts →
	Indirect evidence “RESCOM Environmental Corp (RESCOM) is a national environmental consulting firm, providing environmental, biological and cultural resource assessment services.” Source: RevenueBase Database · checked Sep 19, 2026
22	Sequoia Ecological Consulting	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 19, 2026	11-50	59 contacts →
	Indirect evidence “Founded in 2011, Sequoia is a California-based, woman-owned, small, and disadvantaged business (WBE \| SBE \| DBE) that provides environmental consulting services to public agencies…” Source: RevenueBase Database · checked Sep 19, 2026
23	Ecolsciences, INC	Indirect evidence	Rockaway, United StatesHQ checked Sep 19, 2026	11-50	53 contacts →
	Indirect evidence “EcolSciences, Inc, was founded in 1973 in response to the growing need for responsible environmental planning, as mandated by NEPA, The National Environmental Policy Act.” Source: RevenueBase Database · checked Sep 19, 2026
24	Althouse And Meade, INC	Indirect evidence	Paso Robles, CA, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Indirect evidence “Althouse & Meade expert wildlife biologists, botanists, rangeland managers, and geospatial solutions experts offer identification and analysis of biological resources, provide…” Source: RevenueBase Database · checked Sep 19, 2026
25	ESE Partners	Indirect evidence	Katy, TX, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Indirect evidence “Environmental Science and Engineering Partners (ESE) is Texas’ Most Trusted Environmental Experts, Comprehensive by Design.” 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: ecological survey companies. 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 ecological survey companies.
Partial evidence: Its own public description names part of ecological survey companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ecological survey companies. 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 604 ecological survey companies based in the United States

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Ecological survey companies based in the United States at a glance

As of Sep 19, 2026

52.0%Verified-email coverage

15.1Average contacts per company

1-10Median size (employees)

1.0%Largest-city concentration · Fort Collins

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

351

11-50

192

51-200

201-500

501-1,000

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 604 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 ecological survey companies, 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 “ecological survey companies”. 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 ecological survey companies), 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 ecological survey companies, 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, 4,728 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 ecological survey companies, 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 ecological survey companies are there based in the United States?

RevenueBase identified 604 ecological survey companies 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?

Environmental Science Associates, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most ecological survey companies?

Fort Collins leads with 6 headquartered companies, followed by Houston (6) and Jacksonville (6).

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 4,728 verified decision-maker contacts tracked across these 604 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.