Company lists · Data refreshed September 2026

Top 25 Industrial environmental compliance contractors based in the United States

Name: Industrial environmental compliance contractors 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 3,672 companies tracked

RevenueBase identified 3,672 industrial environmental compliance contractors headquartered in the United States as of September 2026 and tracks 81,459 professional contacts across them, including 29,725 with verified work emails. Houston is the largest hub.

This list covers industrial environmental compliance contractors 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

3,672Companies

81,459Contacts tracked

29,725Verified emails

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The 25 largest industrial environmental compliance contractors based in the United States

Ranked by team size

Top 25 of 3,672 industrial environmental compliance contractors 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 industrial environmental compliance contractors: 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	Clean Harbors	Strong evidence	Norwell, MA, United StatesHQ checked Sep 17, 2026	10001+	8,924 contacts →
	Strong evidence “Clean Harbors is North America’s leading provider of environmental and industrial services.” Source: RevenueBase Database · checked Sep 17, 2026
2	Performance Contractors	Strong evidence	Baton Rouge, LA, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,757 contacts →
	Strong evidence “We began as a merit shop general industrial contractor back in 1979.” Source: RevenueBase Database · checked Sep 17, 2026
3	Montrose Environmental Group	Partial evidence	Little Rock, AR, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,529 contacts →
	Partial evidence “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Source: RevenueBase Database · checked Sep 17, 2026
4	Triumvirate Environmental	Partial evidence	Somerville, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,068 contacts →
	Partial evidence “Triumvirate Environmental provides sustainable environmental solutions to leading companies in the Life Sciences, Healthcare, Education, and Advanced Manufacturing markets.” Source: RevenueBase Database · checked Sep 17, 2026
5	Trinity Consultants	Strong evidence	Dallas, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	961 contacts →
	Strong 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
6	Alliance Technical Group	Partial evidence	Decatur, AL, United StatesHQ checked Sep 17, 2026	1,001-5,000	956 contacts →
	Partial evidence “Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Source: RevenueBase Database · checked Sep 17, 2026
7	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
8	Antea Group USA	Partial evidence	St Paul, MN, United StatesHQ checked Sep 17, 2026	1,001-5,000	658 contacts →
	Partial 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
9	VLS Environmental Solutions, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	481 contacts →
	Partial evidence “At VLS, we address your company’s most significant hurdles with waste management and compliance through sustainable solutions.” Source: RevenueBase Database · checked Sep 17, 2026
10	Rincon Consultants	Partial evidence	Ventura, CA, United StatesHQ checked Sep 17, 2026	501-1,000	479 contacts →
	Partial 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
11	Evergreen North America Industrial Services	Partial evidence	La Porte, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	468 contacts →
	Partial evidence “Evergreen North America Industrial Services offers a comprehensive range of Industrial Services for oil refineries, petrochemical plants, power generation plants, manufacturing…” Source: RevenueBase Database · checked Sep 17, 2026
12	Ensafe	Indirect evidence	Memphis, TN, United StatesHQ checked Sep 17, 2026	201-500	463 contacts →
	Indirect evidence “Innovation is not happenstance at EnSafe Inc.” Source: RevenueBase Database · checked Sep 17, 2026
13	Thompson Industrial Services, LLC	Partial evidence	Sumter, SC, United StatesHQ checked Sep 17, 2026	501-1,000	456 contacts →
	Partial evidence “Thompson Industrial Services, LLC offers the broadest line of specialized industrial cleaning services with advanced automated technology and seasoned personnel.” Source: RevenueBase Database · checked Sep 17, 2026
14	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
15	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
16	Hydrogeologic, INC	Indirect evidence	Reston, VA, United StatesHQ checked Sep 17, 2026	501-1,000	430 contacts →
	Indirect evidence “HydroGeoLogic, Inc.(HGL) is an employee-owned company with over 36 years of experience developing innovative, effective, and sustainable engineering and remediation solutions to…” Source: RevenueBase Database · checked Sep 17, 2026
17	Stratus Building Solutions	Partial evidence	North Hollywood, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	416 contacts →
	Partial evidence “The Leading Provider Of Green Commercial Janitorial Services Stratus Clean is leading the way in health and environmentally conscious commercial cleaning services.” Source: RevenueBase Database · checked Sep 17, 2026
18	SET Environmental, INC	Partial evidence	Wheeling, IL, United StatesHQ checked Sep 17, 2026	201-500	364 contacts →
	Partial evidence “Combining a tradition of integrity, innovation, and excellence, SET Environmental provides environmental management services to a nationwide client base.” Source: RevenueBase Database · checked Sep 17, 2026
19	All4	Partial evidence	Kimberton, PA, United StatesHQ checked Sep 17, 2026	201-500	331 contacts →
	Partial evidence “ALL4 is a global consulting firm committed to shaping a sustainable future through innovative environmental, health, and safety (EHS) and digital solutions.” Source: RevenueBase Database · checked Sep 17, 2026
20	MPS Group	Indirect evidence	Farmington Hills, MI, United StatesHQ checked Sep 17, 2026	1,001-5,000	331 contacts →
	Indirect evidence “When it comes to managed professional services, there’s one company that puts the latest technologies, quality processes, and innovative management techniques to work for you –…” Source: RevenueBase Database · checked Sep 17, 2026
21	Sevenson Environmental Services INC	Partial evidence	Niagara Falls, NY, United StatesHQ checked Sep 17, 2026	501-1,000	277 contacts →
	Partial evidence “Sevenson Environmental Services, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
22	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	259 contacts →
	Partial 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
23	Forgen	Indirect evidence	Centennial, CO, United StatesHQ checked Sep 17, 2026	201-500	255 contacts →
	Indirect evidence “At Forgen, we leave the planet better than we found it.” Source: RevenueBase Database · checked Sep 17, 2026
24	Alliance Environmental Group, LLC	Strong evidence	Azusa, CA, United StatesHQ checked Sep 17, 2026	501-1,000	254 contacts →
	Strong evidence “Alliance is one of the most experienced and trusted environmental contractors in California.” Source: RevenueBase Database · checked Sep 17, 2026
25	Ancon Services	Strong evidence	Los Alamitos, CA, United StatesHQ checked Sep 17, 2026	501-1,000	248 contacts →
	Strong evidence “Founded in 1968, Ancon Services has expanded our services to cover virtually all of our clients industrial and environmental needs.” 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: industrial environmental compliance contractors. 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 industrial environmental compliance contractors.
Partial evidence: Its own public description names part of industrial environmental compliance contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial environmental compliance contractors. 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 3,672 industrial environmental compliance contractors based in the United States

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Industrial environmental compliance contractors based in the United States at a glance

As of Sep 17, 2026

36.5%Verified-email coverage

22.2Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,664

11-50

1,374

51-200

461

201-500

106

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 3,672 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 industrial environmental compliance contractors, 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 “industrial environmental compliance contractors”. 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 industrial environmental compliance contractors), 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 industrial environmental compliance contractors, 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, 29,725 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.

Industrial environmental compliance contractors 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 industrial environmental compliance contractors, 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 industrial environmental compliance contractors are there based in the United States?

RevenueBase identified 3,672 industrial environmental compliance contractors 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?

Clean Harbors, headquartered in Norwell, tops this list with the largest team on record.

Which city has the most industrial environmental compliance contractors?

Houston leads with 86 headquartered companies, followed by New York (38) and Denver (35).

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 29,725 verified decision-maker contacts tracked across these 3,672 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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Industrial environmental compliance contractors 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 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.