Company lists · Data refreshed September 2026

Top 25 Marine environmental engineering companies based in Houston, United States

Name: Marine environmental engineering companies based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 82 companies tracked

RevenueBase identified 82 marine environmental engineering companies headquartered in Houston, United States as of September 2026 and tracks 2,154 professional contacts across them, including 651 with verified work emails. Houston is the largest hub.

This list covers marine environmental engineering companies headquartered in Houston, 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

82Companies

2,154Contacts tracked

651Verified emails

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The 25 largest marine environmental engineering companies based in Houston, United States

Ranked by team size

Top 25 of 82 marine environmental engineering companies based in Houston, 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	GSI Environmental INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	259 contacts →
	Strong 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 17, 2026
2	Delmar Systems	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	207 contacts →
	Indirect evidence “Delmar Systems is the trusted partners to most offshore energy industry’s leaders, delivering innovative and customer-focused anchoring and mooring solutions.” Source: RevenueBase Database · checked Sep 17, 2026
3	Zentech Incorporated	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	181 contacts →
	Partial evidence “Zentech, Inc, an engineering consulting and software development company, headquartered in Houston, TX, is comprised of experienced professionals specializing in providing…” Source: RevenueBase Database · checked Sep 17, 2026
4	Edge Engineering And Science, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	116 contacts →
	Partial evidence “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 17, 2026
5	Marine And Construction	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	n/a	72 contacts →
	Partial evidence “Marine and Construction focuses on customer needs across the entire life cycle of assets within the offshore and marine industry.” Source: RevenueBase Database · checked Sep 17, 2026
6	Pharos Marine Automatic Power	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	71 contacts →
	Partial evidence “More than 100 years in the making, Pharos Marine Automatic Power, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
7	Pinnacle Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	62 contacts →
	Partial evidence “Since 1993, Pinnacle has remained focused on providing practical and complete engineering services to the offshore oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
8	Valsamis INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	41 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
9	Phase Engineering, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	34 contacts →
	Strong evidence “Phase Engineering, LLC, was founded in 1993 and is a leading engineering and environmental consulting firm, serving clients nationwide to deliver trusted environmental solutions.” Source: RevenueBase Database · checked Sep 17, 2026
10	Fleetzero	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	32 contacts →
	Indirect evidence “Fleetzero builds ships and propulsion systems that reduce costs, emissions, and danger to make our customers more profitable, cleaner, and safer.” Source: RevenueBase Database · checked Sep 17, 2026
11	UES Professional Solutions 64, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	31 contacts →
	Strong evidence “Environmental Consulting and Engineering InControl Technologies was established in 1997 to provide high-end quality environmental consulting services to owners of commercial and…” Source: RevenueBase Database · checked Sep 17, 2026
12	RIO Controls & Hydraulics	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	27 contacts →
	Partial evidence “Rio Marine is a conglomerate of companies and divisions that provides a multitude of services from electrical & hydraulic installation & service, hydraulics cylinders (new &…” Source: RevenueBase Database · checked Sep 17, 2026
13	ERC Environmental & Construction Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	18 contacts →
	Partial evidence “ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: RevenueBase Database · checked Sep 17, 2026
14	SKA Consulting, L.P	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	13 contacts →
	Strong evidence “SKA Consulting is a professional environmental engineering and consulting firm providing timely, innovative solutions to today’s environmental challenges.” Source: RevenueBase Database · checked Sep 17, 2026
15	The Shearer Group, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	12 contacts →
	Indirect evidence “The Shearer Group, Inc.(TSGI) located in Houston, Texas, is the global leader for design of inland towboats and barges.” Source: RevenueBase Database · checked Sep 17, 2026
16	PEI Consulting Group, INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	11 contacts →
	Strong evidence “PEI Consulting Group, Inc.(PEI) is an employee owned full-service environmental consulting and engineering firm providing timely, innovative solutions to today’s environmental…” Source: RevenueBase Database · checked Sep 17, 2026
17	Cypress Environmental Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	8 contacts →
	Partial evidence “Cypress Environmental Consulting LLC (CEC) provides a broad range of environmental services including planning, site assessment, and permitting with a focus on regulatory…” Source: RevenueBase Database · checked Sep 17, 2026
18	3d Marine	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	8 contacts →
	Partial evidence “Part of Brookes Bell and providing the same high-quality level of experience and expertise, 3D Marine is a premier full-service consulting group experienced in all aspects of…” Source: RevenueBase Database · checked Sep 17, 2026
19	Corrigan Consulting INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	7 contacts →
	Indirect evidence “Since 1986, CCI has been providing specialized services in hazardous waste compliance, permitting, site investigations, and closures; underground storage tank removals and…” Source: RevenueBase Database · checked Sep 17, 2026
20	Alan C. Mcclure Associates, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	6 contacts →
	Indirect evidence “Headquartered in Houston, Texas, Alan C.” Source: RevenueBase Database · checked Sep 17, 2026
21	Dexon Technology USA INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	6 contacts →
	Strong evidence “Dexon Technology US specializes in providing environmental engineering solutions with innovative technologies within the energy space, focusing on non-destructive testing, in-line…” Source: RevenueBase Database · checked Sep 17, 2026
22	Alpha MAR Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	6 contacts →
	Strong evidence “SHIP REPAIR - OFFSHORE INSTALLATIONS - ENGINEERING - MARITIME SERVICES We understand that your vessels may require both occasional and regular service when calling in U.S ports.” Source: RevenueBase Database · checked Sep 17, 2026
23	7c Engineering LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	5 contacts →
	Partial evidence “7C Engineering, LLC, formed in Houston, Texas, by a group of industry veterans, is an independent consulting firm providing services to the offshore industry including oil and…” Source: RevenueBase Database · checked Sep 17, 2026
24	Ocean Flow International, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	11-50	5 contacts →
	Partial evidence “Ocean Flow International provides high value engineering and project management services to the offshore energy industry worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
25	Contrex Energy Services, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1-10	5 contacts →
	Strong evidence “CES provides project management and engineering services to the Oil & Gas and Marine Construction industries.” 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 82 marine environmental engineering companies based in Houston, United States

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Marine environmental engineering companies based in Houston, United States at a glance

As of Sep 17, 2026

30.2%Verified-email coverage

26.3Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 82 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 Houston, 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 Houston 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, 651 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 in the United States

Marine environmental engineering companies in Houston82
Marine environmental engineering companies in Seattle44
Marine environmental engineering companies in Miami38
Marine environmental engineering companies in Fort Lauderdale28

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 Houston, United States?

RevenueBase identified 82 marine environmental engineering companies headquartered in Houston, 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?

GSI Environmental INC, headquartered in Houston, 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 651 verified decision-maker contacts tracked across these 82 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.

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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.