Company lists · Data refreshed September 2026

Top 25 Wastewater treatment companies worldwide

Name: Wastewater treatment companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 8,238 companies tracked

RevenueBase identified 8,238 wastewater treatment companies worldwide as of September 2026 and tracks 208,064 professional contacts across them, including 61,494 with verified work emails and 0 with mobile numbers. The United States is the largest market and Pune the largest hub.

This list covers wastewater treatment companies 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 16, 2026. Country and city lists for wastewater treatment companies 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 16, 2026 86% judged on-target in blind review

8,238Companies

208,064Contacts tracked

61,494Verified emails

0Mobile numbers

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The 25 largest wastewater treatment companies worldwide

Ranked by team size

Top 25 of 8,238 wastewater treatment companies worldwide, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to wastewater treatment 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	SUEZ	Indirect evidence	Paris, FranceHQ checked Sep 16, 2026	10001+	21,549 contacts →
	Indirect evidence “We provide essential services in the water and waste sectors to preserve resources and improve quality of life wherever we operate.” Source: RevenueBase Database · checked Sep 16, 2026
2	Sabesp	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 16, 2026	10001+	10,050 contacts →
	Indirect evidence “Sabesp is a mixed capital company that was founded in 1973 and is currently responsible for supplying water and collecting and treating sewage in the 375 municipalities of São…” Source: RevenueBase Database · checked Sep 16, 2026
3	GFL Environmental INC	Indirect evidence	Vaughan, ON, CanadaHQ checked Sep 16, 2026	10001+	6,179 contacts →
	Indirect 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 16, 2026
4	Severn Trent	Indirect evidence	Coventry, United KingdomHQ checked Sep 16, 2026	5,001-10,000	5,563 contacts →
	Indirect evidence “Water is wonderful.” Source: RevenueBase Database · checked Sep 16, 2026
5	ION Exchange India LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 16, 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 16, 2026
6	Aegea Saneamento	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 16, 2026	10001+	3,386 contacts →
	Indirect evidence “Somos a Aegea Saneamento, empresa líder no setor.” Source: RevenueBase Database · checked Sep 16, 2026
7	Veolia Australia & NEW Zealand	Partial evidence	Pyrmont, AustraliaHQ checked Sep 16, 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 16, 2026
8	VA Tech Wabag LTD	Indirect evidence	Wabag House, IndiaHQ checked Sep 16, 2026	1,001-5,000	2,375 contacts →
	Indirect evidence “WABAG, a global leader in the water industry, is backed by rich experience spanning over 100 years.” Source: RevenueBase Database · checked Sep 16, 2026
9	Sanepar	Indirect evidence	Curitiba, BrazilHQ checked Sep 16, 2026	5,001-10,000	1,736 contacts →
	Indirect evidence “Visão e Missão Nossa Visão Consolidar a Sanepar como empresa pública, comprometida com a universalização do acesso aos serviços de saneamento ambiental.” Source: RevenueBase Database · checked Sep 16, 2026
10	Carollo Engineers	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,718 contacts →
	Partial evidence “For more than 90 years, Carollo Engineers has been dedicated exclusively to water and wastewater solutions.” Source: RevenueBase Database · checked Sep 16, 2026
11	Chemtreat	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 16, 2026	1,001-5,000	1,404 contacts →
	Indirect evidence “At ChemTreat, we understand that water is a vital resource for our planet.” Source: RevenueBase Database · checked Sep 16, 2026
12	Volvo Eicher Commerical Vehical Limited	Partial evidence	Dhar, IndiaHQ checked Sep 16, 2026	n/a	1,196 contacts →
	Partial evidence “Volvo Eicher Commerical Vehical Limited Service Provider of waste water recycling systems, drinking water plant & industrial water treatment in Indore, Madhya Pradesh.” Source: RevenueBase Database · checked Sep 16, 2026
13	Urban Utilities	Partial evidence	Fortitude Valley, AustraliaHQ checked Sep 16, 2026	1,001-5,000	1,064 contacts →
	Partial evidence “We’re responsible for delivering world-class drinking water and wastewater services to the growing communities of Brisbane, Ipswich, Lockyer Valley, Somerset and Scenic Rim.” Source: RevenueBase Database · checked Sep 16, 2026
14	Inframark	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	973 contacts →
	Indirect evidence “As an Azuria owned company, Inframark is a widely recognized leader in Water Infrastructure Operations and Infrastructure Management Services.” Source: RevenueBase Database · checked Sep 16, 2026
15	SIAAP	Indirect evidence	Paris, FranceHQ checked Sep 16, 2026	1,001-5,000	968 contacts →
	Indirect evidence “Une entreprise publique unique en Europe Son périmètre d'intervention englobe quatre départements et 180 communes reparties sur quatre autres départements, le SIAAP est - le seul…” Source: RevenueBase Database · checked Sep 16, 2026
16	Aquafin	Indirect evidence	Aartselaar, BelgiumHQ checked Sep 16, 2026	1,001-5,000	920 contacts →
	Indirect evidence “Aquafin is in 1990 opgericht door het Vlaamse Gewest om de rioolwaterzuiveringsinfrastructuur in Vlaanderen verder uit te bouwen, te exploiteren en te financieren.” Source: RevenueBase Database · checked Sep 16, 2026
17	Aquatech	Indirect evidence	Canonsburg, PA, United StatesHQ checked Sep 16, 2026	501-1,000	903 contacts →
	Indirect evidence “Aquatech enables the world's most recognized companies to solve complex challenges in water reuse, desalination, minimal and zero liquid discharge, and critical minerals…” Source: RevenueBase Database · checked Sep 16, 2026
18	Essbio	Indirect evidence	Concepcion, ChileHQ checked Sep 16, 2026	1,001-5,000	900 contacts →
	Indirect evidence “Essbio es la segunda empresa sanitaria más importante de Chile.” Source: RevenueBase Database · checked Sep 16, 2026
19	Crystal Clean	Indirect evidence	Hoffman Estates, IL, United StatesHQ checked Sep 16, 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 16, 2026
20	Séché Environnement	Indirect evidence	Changé, FranceHQ checked Sep 16, 2026	5,001-10,000	882 contacts →
	Indirect evidence “Séché Environnement is an agile, high performing company that draws its strength from the breadth of its different business lines.” Source: RevenueBase Database · checked Sep 16, 2026
21	MWH Treatment	Partial evidence	Stockport, United KingdomHQ checked Sep 16, 2026	1,001-5,000	879 contacts →
	Partial evidence “MWH Treatment is a leading Design and Build non-infrastructure solution provider in the UK water sector, with a water sector heritage dating back to 1820.” Source: RevenueBase Database · checked Sep 16, 2026
22	OVIVO	Partial evidence	Montreal, QC, CanadaHQ checked Sep 16, 2026	501-1,000	829 contacts →
	Partial evidence “Ovivo is a powerful global brand, uniting world-renowned trademarks and a highly specialized team of 700 water treatment experts operating across the globe.” Source: RevenueBase Database · checked Sep 16, 2026
23	Yarra Valley Water	Indirect evidence	Melbourne, AustraliaHQ checked Sep 16, 2026	501-1,000	821 contacts →
	Indirect evidence “We service 2 million people and businesses across a area, from Wallan in the north to Warburton in the east.” Source: RevenueBase Database · checked Sep 16, 2026
24	Gradiant	Indirect evidence	Woburn, MA, United StatesHQ checked Sep 16, 2026	1,001-5,000	813 contacts →
	Indirect evidence “Gradiant is a Different Kind of Water Company.” Source: RevenueBase Database · checked Sep 16, 2026
25	Evides Waterbedrijf	Indirect evidence	Rotterdam, NetherlandsHQ checked Sep 16, 2026	501-1,000	753 contacts →
	Indirect evidence “Duurzaam, innovatief en in verbinding met de omgeving; zo werkt Evides Waterbedrijf.” Source: RevenueBase Database · checked Sep 16, 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: wastewater treatment 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 wastewater treatment companies.
Partial evidence: Its own public description names part of wastewater treatment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater treatment 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 8,238 wastewater treatment companies worldwide

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Wastewater treatment companies worldwide at a glance

As of Sep 16, 2026

29.6%Verified-email coverage

25.3Average contacts per company

11-50Median size (employees)

1.4%Largest-city concentration · Pune

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

3,112

11-50

3,116

51-200

1,356

201-500

347

501-1,000

111

1,001-5,000

5,001-10,000

10001+

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 wastewater treatment 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.
Coverage: 40 countries, largest first: the United States, India, Brazil, Italy, Germany, the United Kingdom, France, Spain, Canada, Türkiye and 30 more. Country and city lists for wastewater treatment companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “wastewater treatment 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 wastewater treatment 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 wastewater treatment companies, 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, 61,494 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 16, 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.

Wastewater treatment companies by location

45 lists · largest first

Every Wastewater treatment companies 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 wastewater treatment 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 wastewater treatment companies are there worldwide?

RevenueBase identified 8,238 wastewater treatment companies 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?

SUEZ, headquartered in Worldwide, tops this list with the largest team on record.

Which country has the most wastewater treatment companies?

The United States leads with 1,840 companies, followed by India (1,199) and Brazil (547). Every wastewater treatment companies list by country and city is linked on this page.

Which city has the most wastewater treatment companies?

Pune leads with 114 headquartered companies, followed by Chennai (87) and Ahmedabad (85).

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 61,494 verified decision-maker contacts tracked across these 8,238 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 16, 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.