Company lists · Data refreshed September 2026

Top 25 Marine resource consulting firms based in the United States

Name: Marine resource consulting firms 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 1,243 companies tracked

RevenueBase identified 1,243 marine resource consulting firms headquartered in the United States as of September 2026 and tracks 17,796 professional contacts across them, including 7,803 with verified work emails and 7,973 with mobile numbers. Houston is the largest hub.

This list covers marine resource consulting firms 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

1,243Companies

17,796Contacts tracked

7,803Verified emails

7,973Mobile numbers

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The 25 largest marine resource consulting firms based in the United States

Ranked by team size

Top 25 of 1,243 marine resource consulting firms 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 marine resource consulting firms: 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	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
2	Environmental Science AssociatesPartial 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
3	Anchor QEAPartial 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
4	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
5	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
6	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
7	Imia, LLCPartial evidence	Chesapeake, VA, United StatesHQ checked Sep 5, 2026	1,001-5,000	293
	“Founded in 1985 and a distinguished part of ARMADA Parent Inc, established itself as a premier marine preservation company, delivering an extensive suite of services to…” Source: company website · checked Sep 5, 2026
8	Resolve MarinePartial evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 5, 2026	51-200	277
	“Resolve Marine, a global leader in vessel salvage, emergency response, compliance and specialized marine services, has served and supported clients and projects for 40 years.” Source: company website · checked Sep 5, 2026
9	Ballard Marine ConstructionPartial evidence	Washougal, WA, United StatesHQ checked Sep 5, 2026	51-200	236
	“Ballard Marine Construction (Ballard) is a specialty marine and underwater contractor.” Source: company website · checked Sep 5, 2026
10	Global Diving & Salvage, INCPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	201-500	217
	“Global is a leader in the marine services industry with decades of experience managing complex, critical and technical projects in and around the water.” Source: company website · checked Sep 5, 2026
11	Normandeau Associates, INCIndirect evidence	Bedford, NH, United StatesHQ checked Sep 5, 2026	201-500	189
	Source: company website · checked Sep 5, 2026
12	Enviroscience, INCIndirect evidence	Stow, OH, United StatesHQ checked Sep 5, 2026	51-200	176
	“EnviroScience is a team of over 150 expert biologists, commercial divers, environmental engineers, and environmental scientists that provides biomonitoring, environmental…” Source: company website · checked Sep 5, 2026
13	A.I.S. INCPartial evidence	North Dartmouth, MA, United StatesHQ checked Sep 5, 2026	201-500	173
	“A.I.S, Inc (AIS) supports the stewardship of our nation's ocean resources and their habitats.” Source: company website · checked Sep 5, 2026
14	Phoenix International Holdings, INCIndirect evidence	Largo, United StatesHQ checked Sep 5, 2026	201-500	170
	Source: company website · checked Sep 5, 2026
15	Ecorp Consulting, INCIndirect evidence	Rocklin, CA, United StatesHQ checked Sep 5, 2026	51-200	166
	Source: company website · checked Sep 5, 2026
16	Mostardi PlattIndirect evidence	Elmhurst, IL, United StatesHQ checked Sep 5, 2026	51-200	140
	“Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: company website · checked Sep 5, 2026
17	Stabbert MaritimePartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	201-500	119
	“Stabbert Maritime’s group of companies delivers a wide-range of innovative solutions and support services to our offshore, science, subsea energy, and ship repair clients across…” Source: company website · checked Sep 5, 2026
18	SUSPartial evidence	Baltimore, MD, United StatesHQ checked Sep 5, 2026	11-50	118
	“SUS specializes in underwater marine construction including bridges, dams, pipelines, intakes, outfalls, inspection services, piers and wharfs and other public safety and local…” Source: company website · checked Sep 5, 2026
19	Marine Systems Corporation MscorpPartial evidence	Boston, MA, United StatesHQ checked Sep 5, 2026	51-200	116
	“MSCorp is a privately held Small Business specializing in marine engineering, design, logistical, planning & maintenance support, and computer oriented support to the United…” Source: company website · checked Sep 5, 2026
20	Tdi-BrooksIndirect evidence	College Station, TX, United StatesHQ checked Sep 5, 2026	51-200	107
	“TDI-Brooks is a 27-year-old research and service company specializing in geotechnical and offshore survey projects; multi-disciplinary oceanographic and environmental projects…” Source: company website · checked Sep 5, 2026
21	Woods Hole Group, INCIndirect evidence	Bourne, MA, United StatesHQ checked Sep 5, 2026	51-200	105
	“Woods Hole Group brings over 35 years of experience, committed to exceeding client objectives while safeguarding the environmental health of our planet.” Source: company website · checked Sep 5, 2026
22	TechlawPartial evidence	Chantilly, VA, United StatesHQ checked Sep 5, 2026	201-500	104
	“Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Source: company website · checked Sep 5, 2026
23	GlostenPartial evidence	Seattle, WA, United StatesHQ checked Sep 5, 2026	51-200	104
	“Glosten is a full-service naval architecture and marine engineering consultancy with over 65 years of experience successfully taking on one-of-a-kind marine projects.” Source: company website · checked Sep 5, 2026
24	EEE Consulting, Inc. 3ePartial evidence	Mechanicsville, VA, United StatesHQ checked Sep 5, 2026	11-50	101
	“Consulting, Inc.(3e) is a dynamic and progressive certified small business that specializes in environmental studies, environmental engineering, environmental education, and…” Source: company website · checked Sep 5, 2026
25	Ocean Associates, INCPartial evidence	Arlington, VA, United StatesHQ checked Sep 5, 2026	51-200	100
	“OAI provides professional consulting services to government organizations, the private sector, academia, and UN agencies.” Source: company website · checked Sep 5, 2026

Showing 25 of 1,243 marine resource consulting firms based in the United States

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Marine resource consulting firms based in the United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

HoustonLargest hub · 51 HQs

7,973Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

742

11-50

367

51-200

101

201-500

501-1,000

1,001-5,000

10001+

Verified emails by last verification

0–30

7,275

31–60

489

61–90

90–180

180+

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 marine resource consulting firms, 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 “marine resource consulting firms”. 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 marine resource consulting firms, 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, 7,803 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.

Marine resource consulting firms by metro

Frequently asked

How many marine resource consulting firms are there based in the United States?

RevenueBase identified 1,243 marine resource consulting firms 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 marine resource consulting firms?

Houston leads with 51 headquartered companies, followed by Seattle (37) and Miami (27).

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 7,803 verified decision-maker contacts tracked across these 1,243 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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Marine resource consulting firms by geography

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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.