Company lists · Data refreshed September 2026

Top 25 Marine environmental engineering companies based in the United States

Name: Marine environmental engineering 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 17, 2026 1,974 companies tracked

RevenueBase identified 1,974 marine environmental engineering companies headquartered in the United States as of September 2026 and tracks 75,337 professional contacts across them, including 32,363 with verified work emails. Houston is the largest hub.

This list covers marine environmental engineering 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 17, 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 17, 2026 86% judged on-target in blind review

1,974Companies

75,337Contacts tracked

32,363Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest marine environmental engineering companies based in the United States

Ranked by team size

Top 25 of 1,974 marine environmental engineering companies based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to marine environmental engineering 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	Tetra Tech	Strong evidence	Pasadena, CA, United StatesHQ checked Sep 17, 2026	10001+	12,999 contacts →
	Strong evidence “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
2	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,473 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
3	Geosyntec Consultants	Strong evidence	Boca Raton, FL, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,393 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
4	Providence	Strong evidence	Baton Rouge, LA, United StatesHQ checked Sep 17, 2026	n/a	2,232 contacts →
	Strong evidence “Providence is an employee-owned engineering and environmental consulting firm.” Source: RevenueBase Database · checked Sep 17, 2026
5	Carollo Engineers	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,718 contacts →
	Indirect evidence “For more than 90 years, Carollo Engineers has been dedicated exclusively to water and wastewater solutions.” Source: RevenueBase Database · checked Sep 17, 2026
6	Swca Environmental Consultants	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,629 contacts →
	Partial 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 17, 2026
7	Weston Solutions, INC	Partial evidence	West Chester, PA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,441 contacts →
	Partial evidence “Weston Solutions, Inc.(Weston) is a 100% employee-owned environmental and infrastructure services firm committed to safety and providing measurable client value.” Source: RevenueBase Database · checked Sep 17, 2026
8	Apex Companies	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,137 contacts →
	Indirect evidence “Who is Apex?” Source: RevenueBase Database · checked Sep 17, 2026
9	Barr Engineering CO	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,088 contacts →
	Strong evidence “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: RevenueBase Database · checked Sep 17, 2026
10	Trinity Consultants	Partial evidence	Dallas, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	961 contacts →
	Partial evidence “Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Source: RevenueBase Database · checked Sep 17, 2026
11	Parametrix	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 17, 2026	501-1,000	880 contacts →
	Indirect evidence “At Parametrix, we help our clients imagine what's possible.” Source: RevenueBase Database · checked Sep 17, 2026
12	GZA Geoenvironmental, INC	Indirect evidence	Norwood, MA, United StatesHQ checked Sep 17, 2026	501-1,000	880 contacts →
	Indirect evidence “Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Source: RevenueBase Database · checked Sep 17, 2026
13	ATC Group Services LLC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 17, 2026	1,001-5,000	865 contacts →
	Indirect evidence “ATC Group Services LLC is now Atlas.” Source: RevenueBase Database · checked Sep 17, 2026
14	DUDEK	Strong evidence	Encinitas, CA, United StatesHQ checked Sep 17, 2026	501-1,000	795 contacts →
	Strong evidence “Dudek is an environmental, planning, and engineering consulting firm.” Source: RevenueBase Database · checked Sep 17, 2026
15	The Foth Companies	Partial evidence	De Pere, WI, United StatesHQ checked Sep 17, 2026	501-1,000	781 contacts →
	Partial evidence “By combining science, engineering, and technology with a true collaborative spirit, Foth has delivered innovative solutions to our clients since 1938.” Source: RevenueBase Database · checked Sep 17, 2026
16	Environmental Science Associates	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 17, 2026	501-1,000	732 contacts →
	Partial evidence “ESA is a 100% employee-owned environmental consulting firm.” Source: RevenueBase Database · checked Sep 17, 2026
17	Antea Group USA	Strong evidence	St Paul, MN, United StatesHQ checked Sep 17, 2026	1,001-5,000	658 contacts →
	Strong evidence “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: RevenueBase Database · checked Sep 17, 2026
18	Foss Maritime Company	Partial evidence	Seattle, WA, United StatesHQ checked Sep 17, 2026	501-1,000	531 contacts →
	Partial evidence “Foss Maritime provides comprehensive marine transportation and logistics services.” Source: RevenueBase Database · checked Sep 17, 2026
19	Trident Maritime Systems	Partial evidence	Arlington, VA, United StatesHQ checked Sep 17, 2026	1,001-5,000	527 contacts →
	Partial evidence “Knowledge, Value and Agility Over maritime professionals - engineers, project managers, designers, technicians, craftsmen, integrators and innovators in 19 countries are proud to…” Source: RevenueBase Database · checked Sep 17, 2026
20	BSC Group	Indirect evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	51-200	504 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 17, 2026
21	Anchor QEA	Strong evidence	Seattle, WA, United StatesHQ checked Sep 17, 2026	501-1,000	479 contacts →
	Strong 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 17, 2026
22	Rincon Consultants	Strong evidence	Ventura, CA, United StatesHQ checked Sep 17, 2026	501-1,000	479 contacts →
	Strong 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 17, 2026
23	Fuss & O'neill	Strong evidence	Hartford, CT, United StatesHQ checked Sep 17, 2026	201-500	461 contacts →
	Strong evidence “Fuss & O’Neill is a civil and environmental engineering firm that provides client-specific, forward-thinking, and holistic solutions.” Source: RevenueBase Database · checked Sep 17, 2026
24	Groundwater & Environmental Services, INC	Partial evidence	Wall Township, NJ, United StatesHQ checked Sep 17, 2026	201-500	447 contacts →
	Partial evidence “We are Groundwater & Environmental Services, Inc, better known as GES.” Source: RevenueBase Database · checked Sep 17, 2026
25	ROUX	Partial evidence	Islandia, NY, United StatesHQ checked Sep 17, 2026	201-500	433 contacts →
	Partial evidence “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Source: RevenueBase Database · checked Sep 17, 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: marine environmental engineering 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 marine environmental engineering companies.
Partial evidence: Its own public description names part of marine environmental engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine environmental engineering 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 1,974 marine environmental engineering companies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 32,363 reachable decision-makers.

Free signup · no credit card

View the full list →

Marine environmental engineering companies based in the United States at a glance

As of Sep 17, 2026

43.0%Verified-email coverage

38.2Average contacts per company

11-50Median size (employees)

4.2%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

871

11-50

722

51-200

257

201-500

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 1,974 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 marine environmental engineering 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 “marine environmental engineering 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 marine environmental engineering 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 marine environmental engineering 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, 32,363 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 17, 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 environmental engineering companies by metro

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 marine environmental engineering 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 marine environmental engineering companies are there based in the United States?

RevenueBase identified 1,974 marine environmental engineering 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?

Tetra Tech, headquartered in Pasadena, tops this list with the largest team on record.

Which city has the most marine environmental engineering companies?

Houston leads with 82 headquartered companies, followed by Seattle (44) and Miami (38).

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 32,363 verified decision-maker contacts tracked across these 1,974 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 17, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,974 marine environmental engineering companies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Marine environmental engineering companies by geography

Browse the directory

Browse: Companies home · All United States lists · All Marine environmental engineering companies lists · New lists

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.