Company lists · Data refreshed September 2026

Top 25 Waste consulting firms worldwide

Name: Waste consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 16,627 companies tracked

RevenueBase identified 16,627 waste consulting firms worldwide as of September 2026 and tracks 296,877 professional contacts across them, including 87,801 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers waste consulting firms worldwide, 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 29, 2026. Country and city lists for waste consulting firms follow the table.

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 29, 2026 86% judged on-target in blind review

16,627Companies

296,877Contacts tracked

87,801Verified emails

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The 25 largest waste consulting firms worldwide

Ranked by team size

Top 25 of 16,627 waste consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to waste 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 29, 2026	10001+	24,303 contacts →
	Indirect evidence “WM is North America's leading provider of integrated environmental solutions.” Source: RevenueBase Database · checked Sep 29, 2026
2	Republic Services	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 29, 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 29, 2026
3	Clean Harbors	Indirect evidence	Norwell, MA, United StatesHQ checked Sep 29, 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 29, 2026
4	GFL Environmental INC	Partial evidence	Vaughan, ON, CanadaHQ checked Sep 29, 2026	10001+	6,179 contacts →
	Partial evidence “GFL Environmental is the only major diversified environmental services company in North America offering services in solid waste management, liquid waste management and soil…” Source: RevenueBase Database · checked Sep 29, 2026
5	ION Exchange India LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 29, 2026	1,001-5,000	3,810 contacts →
	Partial evidence “At Ion Exchange India, we bring you total environment solutions - water treatment, liquid waste treatment & recycle, air pollution control, solid & hazardous waste management and…” Source: RevenueBase Database · checked Sep 29, 2026
6	Cleanaway Waste Management	Partial evidence	Melbourne, AustraliaHQ checked Sep 29, 2026	5,001-10,000	3,005 contacts →
	Partial evidence “Cleanaway Waste Management Limited is Australia’s largest, publicly listed waste management company.” Source: RevenueBase Database · checked Sep 29, 2026
7	RE Sustainability Limited	Indirect evidence	Hyderabad, IndiaHQ checked Sep 29, 2026	10001+	2,607 contacts →
	Indirect evidence “Re Sustainability Limited (RE), a KKR-backed company, is one of Asia’s leading providers of comprehensive environment management services.” Source: RevenueBase Database · checked Sep 29, 2026
8	Veolia Australia & NEW Zealand	Partial evidence	Pyrmont, AustraliaHQ checked Sep 29, 2026	5,001-10,000	2,476 contacts →
	Partial evidence “Veolia Australia and New Zealand is a leading provider of environmental solutions across water and wastewater services, industrial cleaning, waste management and resource recovery…” Source: RevenueBase Database · checked Sep 29, 2026
9	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 29, 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 29, 2026
10	Civil & Environmental Consultants, INC	Partial evidence	Moon Township, PA, United StatesHQ checked Sep 29, 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 29, 2026
11	Hazen And Sawyer	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 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 29, 2026
12	Swca Environmental Consultants	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 29, 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 29, 2026
13	Montrose Environmental Group	Indirect evidence	Little Rock, AR, United StatesHQ checked Sep 29, 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 29, 2026
14	Averda	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 2026	10001+	1,417 contacts →
	Partial evidence “For over 35 years, we have delivered integrated waste management services across multiple regions.” Source: RevenueBase Database · checked Sep 29, 2026
15	Rumpke Waste & Recycling	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 29, 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 29, 2026
16	US Ecology Inc., A Republic Services Company	Indirect evidence	Boise, ID, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,360 contacts →
	Indirect evidence “US Ecology is a Republic Services company.” Source: RevenueBase Database · checked Sep 29, 2026
17	Clean Earth	Indirect evidence	King Of Prussia, PA, United StatesHQ checked Sep 29, 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 29, 2026
18	Casella Waste Systems, INC	Indirect evidence	Rutland, VT, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,231 contacts →
	Indirect 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 29, 2026
19	DGE Danmark	Indirect evidence	Højbjerg, DenmarkHQ checked Sep 29, 2026	n/a	1,176 contacts →
	Indirect evidence “Miljø er vores kernekompetence og vores ansvar.” Source: RevenueBase Database · checked Sep 29, 2026
20	Apex Companies	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,137 contacts →
	Indirect evidence “Who is Apex?” Source: RevenueBase Database · checked Sep 29, 2026
21	Barr Engineering CO	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,088 contacts →
	Partial 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 29, 2026
22	Derichebourg Environnement	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	5,001-10,000	1,085 contacts →
	Indirect evidence “DERICHEBOURG Environnement propose au monde de l’industrie, aux collectivités et aux particuliers une offre complète et intégrée de services couvrant la collecte, la gestion, le…” Source: RevenueBase Database · checked Sep 29, 2026
23	Reworld Waste	Partial evidence	United StatesHQ checked Sep 29, 2026	1,001-5,000	1,084 contacts →
	Partial evidence “Reworld™ is a leader in sustainable waste solutions, providing innovative and environmentally responsible services to a global community.” Source: RevenueBase Database · checked Sep 29, 2026
24	Triumvirate Environmental	Indirect evidence	Somerville, MA, United StatesHQ checked Sep 29, 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 29, 2026
25	WSP EN Chile	Indirect evidence	Vitacura, ChileHQ checked Sep 29, 2026	10001+	988 contacts →
	Indirect evidence “WSP en una empresa líder en servicios profesionales de consultoría en recursos hídricos, ingeniería, medio ambiente y sustentabilidad.” Source: RevenueBase Database · checked Sep 29, 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 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 consulting firms.
Partial evidence: Its own public description names part of waste 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 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 16,627 waste consulting firms worldwide

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Waste consulting firms worldwide at a glance

As of Sep 29, 2026

29.6%Verified-email coverage

17.9Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

8,560

11-50

5,242

51-200

1,797

201-500

532

501-1,000

160

1,001-5,000

157

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 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.
Coverage: Every country. Country and city lists for waste consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “waste 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 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 consulting firms, and records with no verified work email.
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, 87,801 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 29, 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 consulting firms by location

69 lists · largest first

Every Waste consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 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 consulting firms are there worldwide?

RevenueBase identified 16,627 waste consulting firms worldwide 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 country has the most waste consulting firms?

The United States leads with 3,026 companies, followed by Brazil (1,843) and the United Kingdom (967). Every waste consulting firms list by country and city is linked on this page.

Which city has the most waste consulting firms?

Sao Paulo leads with 220 headquartered companies, followed by London (92) and Houston (83).

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 87,801 verified decision-maker contacts tracked across these 16,627 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 29, 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.