Company lists · Data refreshed September 2026

Top 25 Waste management consulting firms based in the United States

Name: Waste management 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 14, 2026 3,697 companies tracked

RevenueBase identified 3,697 waste management consulting firms headquartered in the United States as of September 2026 and tracks 154,591 professional contacts across them, including 59,073 with verified work emails. Houston is the largest hub.

This list covers waste management 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 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 14, 2026 86% judged on-target in blind review

3,697Companies

154,591Contacts tracked

59,073Verified emails

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The 25 largest waste management consulting firms based in the United States

Ranked by team size

Top 25 of 3,697 waste management consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to waste management consulting firms: 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	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	10001+	24,303 contacts →
	Indirect evidence “WM is North America's leading provider of integrated environmental solutions.” Source: RevenueBase Database · checked Sep 14, 2026
2	Republic Services	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 14, 2026	10001+	17,016 contacts →
	Partial evidence “Republic Services provides the most complete set of recycling, waste and environmental solutions from a single provider.” Source: RevenueBase Database · checked Sep 14, 2026
3	Tetra Tech	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 14, 2026	10001+	12,999 contacts →
	Indirect 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 14, 2026
4	Clean Harbors	Indirect evidence	Norwell, MA, United StatesHQ checked Sep 14, 2026	10001+	8,924 contacts →
	Indirect evidence “Clean Harbors is North America’s leading provider of environmental and industrial services.” Source: RevenueBase Database · checked Sep 14, 2026
5	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 14, 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 14, 2026
6	Civil & Environmental Consultants, INC	Partial evidence	Moon Township, PA, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,145 contacts →
	Partial 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 14, 2026
7	Hazen And Sawyer	Indirect evidence	New York, NY, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,100 contacts →
	Indirect evidence “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Source: RevenueBase Database · checked Sep 14, 2026
8	Swca Environmental Consultants	Strong evidence	Phoenix, AZ, United StatesHQ checked Sep 14, 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 14, 2026
9	Waste PRO USA	Partial evidence	Longwood, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,560 contacts →
	Partial evidence “Waste Pro USA, Inc.” Source: RevenueBase Database · checked Sep 14, 2026
10	Montrose Environmental Group	Indirect evidence	Little Rock, AR, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,529 contacts →
	Indirect 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 14, 2026
11	Rumpke Waste & Recycling	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,360 contacts →
	Partial 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 14, 2026
12	US Ecology Inc., A Republic Services Company	Indirect evidence	Boise, ID, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,360 contacts →
	Indirect evidence “US Ecology is a Republic Services company.” Source: RevenueBase Database · checked Sep 14, 2026
13	Clean Earth	Indirect evidence	King Of Prussia, PA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,275 contacts →
	Indirect 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 14, 2026
14	Casella Waste Systems, INC	Partial evidence	Rutland, VT, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,231 contacts →
	Partial evidence “Casella, headquartered in Rutland, Vermont, is one of the largest recyclers and most experienced fully integrated resource management companies in the Eastern United States.” Source: RevenueBase Database · checked Sep 14, 2026
15	Apex Companies	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,137 contacts →
	Indirect evidence “Who is Apex?” Source: RevenueBase Database · checked Sep 14, 2026
16	Triumvirate Environmental	Indirect evidence	Somerville, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,068 contacts →
	Indirect 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 14, 2026
17	Advanced Disposal Services, INC	Strong evidence	Ponte Vedra, FL, United StatesHQ checked Sep 14, 2026	5,001-10,000	968 contacts →
	Strong evidence “Advanced Disposal, now part of Waste Management Waste Management, based in Houston, Texas, is the leading provider of comprehensive waste management environmental services in…” Source: RevenueBase Database · checked Sep 14, 2026
18	Trinity Consultants	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 14, 2026	1,001-5,000	961 contacts →
	Indirect 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 14, 2026
19	Recology	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 14, 2026	1,001-5,000	957 contacts →
	Indirect evidence “At Recology, you’ll join a team of passionate, creative, and dedicated individuals who are leaders in sustainability.” Source: RevenueBase Database · checked Sep 14, 2026
20	Alliance Technical Group	Indirect evidence	Decatur, AL, United StatesHQ checked Sep 14, 2026	1,001-5,000	956 contacts →
	Indirect 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 14, 2026
21	Crystal Clean	Indirect evidence	Hoffman Estates, IL, United StatesHQ checked Sep 14, 2026	1,001-5,000	899 contacts →
	Indirect evidence “Crystal Clean is a national leader in the environmental services market, providing the smart alternative.” Source: RevenueBase Database · checked Sep 14, 2026
22	ATC Group Services LLC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 14, 2026	1,001-5,000	865 contacts →
	Indirect evidence “ATC Group Services LLC is now Atlas.” Source: RevenueBase Database · checked Sep 14, 2026
23	FCC Environmental Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1,001-5,000	828 contacts →
	Indirect evidence “A Leader in Environmental Services FCC Environmental Services is proud to serve over 14 million Americans across 7 states, supported by a dedicated team of Our 1200+ vehicle fleet…” Source: RevenueBase Database · checked Sep 14, 2026
24	Psomas	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 14, 2026	501-1,000	748 contacts →
	Indirect evidence “Our award-winning projects are produced through innovation, creativity, and technical expertise.” Source: RevenueBase Database · checked Sep 14, 2026
25	WIN Waste Innovations	Strong evidence	Portsmouth, NH, United StatesHQ checked Sep 14, 2026	1,001-5,000	635 contacts →
	Strong evidence “WIN Waste Innovations is a waste management company committed to delivering essential waste management solutions to customers and communities supported by our team of 2,100…” Source: RevenueBase Database · checked Sep 14, 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: waste management consulting firms. 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 waste management consulting firms.
Partial evidence: Its own public description names part of waste management consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name waste management consulting firms. 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 3,697 waste management consulting firms based in the United States

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Waste management consulting firms based in the United States at a glance

As of Sep 14, 2026

38.2%Verified-email coverage

41.8Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · Houston

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

1,665

11-50

1,309

51-200

469

201-500

136

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 3,697 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 waste management consulting firms, 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 “waste management consulting firms”. 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 waste management consulting firms), 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 waste management 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 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, 59,073 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 14, 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.

Waste management consulting firms 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 waste management consulting firms, 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 waste management consulting firms are there based in the United States?

RevenueBase identified 3,697 waste management 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?

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

Which city has the most waste management consulting firms?

Houston leads with 111 headquartered companies, followed by New York (49) and Chicago (41).

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 59,073 verified decision-maker contacts tracked across these 3,697 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 14, 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.