Company lists · Data refreshed September 2026

Top 25 Environmental services companies based in the United States

Name: Environmental services 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 19, 2026 6,050 companies tracked

RevenueBase identified 6,050 environmental services companies headquartered in the United States as of September 2026 and tracks 187,239 professional contacts across them, including 58,558 with verified work emails. Houston is the largest hub.

This list covers environmental services 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 19, 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 19, 2026 86% judged on-target in blind review

6,050Companies

187,239Contacts tracked

58,558Verified emails

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The 25 largest environmental services companies based in the United States

Ranked by team size

Top 25 of 6,050 environmental services companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental services 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	WM	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	10001+	24,303 contacts →
	Strong evidence “WM is North America's leading provider of integrated environmental solutions.” Source: RevenueBase Database · checked Sep 19, 2026
2	Clean Harbors	Strong evidence	Norwell, MA, United StatesHQ checked Sep 19, 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 19, 2026
3	Crothall Healthcare	Indirect evidence	Wayne, PA, United StatesHQ checked Sep 19, 2026	10001+	5,575 contacts →
	Indirect evidence “By providing exceptional service and positive experiences, Crothall Healthcare has become the nation’s leading healthcare support services provider.” Source: RevenueBase Database · checked Sep 19, 2026
4	C&w Services	Indirect evidence	Needham, MA, United StatesHQ checked Sep 19, 2026	10001+	3,322 contacts →
	Indirect evidence “Raising the Value of Facilities Services.” Source: RevenueBase Database · checked Sep 19, 2026
5	Safety-Kleen	Strong evidence	Plano, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,827 contacts →
	Strong evidence “Safety-Kleen is a leading environmental services company engaged in used oil recycling and refining (EcoPower brand), parts cleaning and other responsible environmental solutions.” Source: RevenueBase Database · checked Sep 19, 2026
6	Tennant Company	Indirect evidence	Eden Prairie, MN, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,723 contacts →
	Indirect evidence “Tennant Company is a recognized leader of the cleaning industry.” Source: RevenueBase Database · checked Sep 19, 2026
7	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 19, 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 19, 2026
8	Cleaning Services Group	Indirect evidence	Danvers, MA, United StatesHQ checked Sep 19, 2026	n/a	2,418 contacts →
	Indirect evidence “Cleaning Services Group, Inc.(CSG) is a multi-faceted, national building services company dedicated to providing our clients with cost effective cleaning and maintenance solutions…” Source: RevenueBase Database · checked Sep 19, 2026
9	NCH	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 19, 2026	10001+	2,361 contacts →
	Indirect evidence “Cleaning water, conserving energy and delivering maintenance solutions since 1919.” Source: RevenueBase Database · checked Sep 19, 2026
10	ABM Janitorial Services	Indirect evidence	Sugar Land, TX, United StatesHQ checked Sep 19, 2026	10001+	2,154 contacts →
	Indirect evidence “Commercial Cleaning Service That Shines There’s more to janitorial services than a mop hitting the floor.” Source: RevenueBase Database · checked Sep 19, 2026
11	Civil & Environmental Consultants, INC	Strong evidence	Moon Township, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,145 contacts →
	Strong evidence “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Source: RevenueBase Database · checked Sep 19, 2026
12	SSC Services For Education	Indirect evidence	Knoxville, TN, United StatesHQ checked Sep 19, 2026	10001+	1,807 contacts →
	Indirect evidence “SSC Services For Education is the premier provider of custom facility services in educational spaces.” Source: RevenueBase Database · checked Sep 19, 2026
13	Swca Environmental Consultants	Strong evidence	Phoenix, AZ, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,629 contacts →
	Strong 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 19, 2026
14	Montrose Environmental Group	Strong evidence	Little Rock, AR, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,529 contacts →
	Strong 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 19, 2026
15	Rumpke Waste & Recycling	Strong evidence	Cincinnati, OH, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,360 contacts →
	Strong evidence “Rumpke Waste and Recycling has been committed to keeping neighborhoods and businesses clean and green since 1932 by providing environmentally friendly waste disposal and recycling…” Source: RevenueBase Database · checked Sep 19, 2026
16	US Ecology Inc., A Republic Services Company	Indirect evidence	Boise, ID, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,360 contacts →
	Indirect evidence “US Ecology is a Republic Services company.” Source: RevenueBase Database · checked Sep 19, 2026
17	PMI	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 19, 2026	n/a	1,308 contacts →
	Indirect evidence “Training and Development Solutions” Source: RevenueBase Database · checked Sep 19, 2026
18	Clean Earth	Strong evidence	King Of Prussia, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,275 contacts →
	Strong evidence “Veolia has completed the acquisition of Clean Earth, bringing together two organizations with a shared commitment to environmental stewardship, safety and operational excellence.” Source: RevenueBase Database · checked Sep 19, 2026
19	The Budd Group	Indirect evidence	Winston-salem, NC, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,190 contacts →
	Indirect evidence “The Budd Group is a leading facilities services company, delivering high quality janitorial, maintenance and landscaping services to clients throughout the Southeast.” Source: RevenueBase Database · checked Sep 19, 2026
20	Diversified Maintenance	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 19, 2026	5,001-10,000	1,183 contacts →
	Indirect evidence “Diversified Maintenance goes above and beyond to make sure our operational excellence and specialized cleaning and maintenance services help businesses run smoothly and seamlessly.” Source: RevenueBase Database · checked Sep 19, 2026
21	Packers Sanitation Services, Inc. Pssi	Indirect evidence	Kieler, WI, United StatesHQ checked Sep 19, 2026	10001+	1,129 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
22	Barr Engineering CO	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 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 19, 2026
23	Triumvirate Environmental	Strong evidence	Somerville, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,068 contacts →
	Strong 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 19, 2026
24	IEA	Strong evidence	Brooklyn Park, MN, United StatesHQ checked Sep 19, 2026	n/a	982 contacts →
	Strong evidence “The Institute for Environmental Assessment, Inc.(IEA) is small business committed to providing trusted environmental safety consulting services for private and public…” Source: RevenueBase Database · checked Sep 19, 2026
25	Trinity Consultants	Strong evidence	Dallas, TX, United StatesHQ checked Sep 19, 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 19, 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: environmental services 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 environmental services companies.
Partial evidence: Its own public description names part of environmental services companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental services 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 6,050 environmental services companies based in the United States

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Environmental services companies based in the United States at a glance

As of Sep 19, 2026

31.3%Verified-email coverage

30.9Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

2,636

11-50

2,095

51-200

825

201-500

259

501-1,000

1,001-5,000

108

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 6,050 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 environmental services 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 “environmental services 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 environmental services 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 environmental services 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, 58,558 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 19, 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.

Environmental services 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 environmental services 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 environmental services companies are there based in the United States?

RevenueBase identified 6,050 environmental services 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?

WM, headquartered in Houston, tops this list with the largest team on record.

Which city has the most environmental services companies?

Houston leads with 142 headquartered companies, followed by New York (100) and Atlanta (55).

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 58,558 verified decision-maker contacts tracked across these 6,050 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 19, 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.