Company lists · Data refreshed September 2026

Top 25 Natural resource management consultants based in the United States

Name: Natural resource management consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 1,858 companies tracked

RevenueBase identified 1,858 natural resource management consultants headquartered in the United States as of September 2026 and tracks 44,039 professional contacts across them, including 24,082 with verified work emails and 20,899 with mobile numbers. Seattle is the largest hub.

This list covers natural resource management consultants 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

1,858Companies

44,039Contacts tracked

24,082Verified emails

20,899Mobile numbers

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The 25 largest natural resource management consultants based in the United States

Ranked by team size

Top 25 of 1,858 natural resource management consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names natural resource management consultants: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	WSP In The U.SPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	10001+	9,318
	“What if you could shape built and natural environments – and the future of those that use them?” Source: company website · checked Sep 5, 2026
2	Swca Environmental ConsultantsPartial evidence	Phoenix, AZ, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,629
	“Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: company website · checked Sep 5, 2026
3	Barr Engineering COIndirect evidence	Minneapolis, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,088
	“Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: company website · checked Sep 5, 2026
4	Trinity ConsultantsPartial evidence	Dallas, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	961
	“Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Source: company website · checked Sep 5, 2026
5	ParametrixIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	501-1,000	880
	“At Parametrix, we help our clients imagine what's possible.” Source: company website · checked Sep 5, 2026
6	ATC Group Services LLCIndirect evidence	Lafayette, LA, United StatesHQ checked Sep 5, 2026	1,001-5,000	865
	“ATC Group Services LLC is now Atlas.” Source: company website · checked Sep 5, 2026
7	DUDEKIndirect evidence	Encinitas, CA, United StatesHQ checked Sep 5, 2026	501-1,000	795
	“Dudek is an environmental, planning, and engineering consulting firm.” Source: company website · checked Sep 5, 2026
8	Environmental Science AssociatesIndirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	501-1,000	732
	“ESA is a 100% employee-owned environmental consulting firm.” Source: company website · checked Sep 5, 2026
9	Tighe & BondIndirect evidence	Westfield, MA, United StatesHQ checked Sep 5, 2026	501-1,000	646
	“Tighe & Bond is the Northeast’s leading engineering, environmental, planning, and design consulting firm.” Source: company website · checked Sep 5, 2026
10	Trihydro CorporationPartial evidence	Laramie, WY, United StatesHQ checked Sep 5, 2026	501-1,000	577
	“Headquartered in Laramie, Wyoming, Trihydro provides environmental consulting, engineering and surveying, air quality and process management, information technology, and water and…” Source: company website · checked Sep 5, 2026
11	EBI ConsultingIndirect evidence	Burlington, MA, United StatesHQ checked Sep 5, 2026	501-1,000	535
	“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: company website · checked Sep 5, 2026
12	BSC GroupIndirect evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	504
	“BSC Group, Inc.(BSC) is a multidisciplinary consulting firm with a staff of more than 200 professionals and offices in Boston, Worcester, Andover, and West Yarmouth, MA, as well…” Source: company website · checked Sep 5, 2026
13	Anchor QEAIndirect evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	501-1,000	479
	“Headquartered in Seattle, Washington, Anchor QEA is a nationally recognized environmental science and engineering consulting firm specializing in aquatic, shoreline, and water…” Source: company website · checked Sep 5, 2026
14	Rincon ConsultantsPartial evidence	Ventura, CA, United StatesHQ checked Sep 5, 2026	501-1,000	479
	“Rincon Consultants is a multi-disciplinary environmental sciences, planning, and engineering consulting firm that provides quality professional services to government and industry.” Source: company website · checked Sep 5, 2026
15	Groundwater & Environmental Services, INCIndirect evidence	Wall Township, NJ, United StatesHQ checked Sep 5, 2026	201-500	447
	“We are Groundwater & Environmental Services, Inc, better known as GES.” Source: company website · checked Sep 5, 2026
16	AEI ConsultantsPartial evidence	Walnut Creek, CA, United StatesHQ checked Sep 5, 2026	201-500	433
	“AEI Consultants provides building, environmental, land and sustainability assessment and consulting services throughout North America.” Source: company website · checked Sep 5, 2026
17	Chronicle HeritageStrong evidence	Phoenix, AZ, United StatesHQ checked Sep 5, 2026	501-1,000	423
	“We are a cultural resource management firm operating across the United States and internationally, dedicated to stewarding our shared heritage.” Source: company website · checked Sep 5, 2026
18	Western Ecosystems Technology, Inc. WestIndirect evidence	Cheyenne, WY, United StatesHQ checked Sep 5, 2026	201-500	408
	“WEST provides environmental and statistical consulting services and contract research nationally and internationally to industry, government, and private organizations.” Source: company website · checked Sep 5, 2026
19	P2sIndirect evidence	Long Beach, CA, United StatesHQ checked Sep 5, 2026	201-500	375
	“P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: company website · checked Sep 5, 2026
20	CME AssociatesIndirect evidence	Parlin, NJ, United StatesHQ checked Sep 5, 2026	201-500	336
	“CME Associates, with eight (8) office locations throughout New Jersey, provides a complete range of Environmental, Geotechnical, Engineering, Surveying and Planning services.” Source: company website · checked Sep 5, 2026
21	LSAIndirect evidence	Irvine, CA, United StatesHQ checked Sep 5, 2026	201-500	332
	“LSA is a diversified environmental, transportation, and community planning firm that evolved from a small consulting firm.” Source: company website · checked Sep 5, 2026
22	Environmental Consulting & Technology, Inc. ECTPartial evidence	Gainesville, FL, United StatesHQ checked Sep 5, 2026	201-500	305
	“Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Source: company website · checked Sep 5, 2026
23	Wetland Studies And Solutions, Inc. Wssi , A Davey Tree CompanyPartial evidence	Gainesville, VA, United StatesHQ checked Sep 5, 2026	201-500	268
	“For more than 30 years, WSSI has been the trusted partner in environmental, regulatory, cultural resources, and water resources engineering consulting.” Source: company website · checked Sep 5, 2026
24	Nova Group, GBCIndirect evidence	St. Louis Park, MN, United StatesHQ checked Sep 5, 2026	201-500	264
	“Nova Group, GBC is an international, multidisciplinary advising firm providing environmental, engineering and energy services throughout North America and around the globe.” Source: company website · checked Sep 5, 2026
25	GSI Environmental INCIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	201-500	259
	“GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: company website · checked Sep 5, 2026

Showing 25 of 1,858 natural resource management consultants based in the United States

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Natural resource management consultants based in the United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

SeattleLargest hub · 35 HQs

20,899Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

1,162

11-50

519

51-200

123

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

22,354

31–60

1,555

61–90

90–180

180+

163

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 natural resource management consultants, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “natural resource management consultants”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among natural resource management consultants, 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 an evidence 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, 24,082 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 5, 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.

Natural resource management consultants by metro

Frequently asked

How many natural resource management consultants are there based in the United States?

RevenueBase identified 1,858 natural resource management consultants 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?

WSP In The U.S, headquartered in New York, tops this list with the largest team on record.

Which city has the most natural resource management consultants?

Seattle leads with 35 headquartered companies, followed by Houston (30) and Portland (29).

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 24,082 verified decision-maker contacts tracked across these 1,858 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 5, 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.