Company lists · Data refreshed September 2026

Top 25 Wastewater treatment plants worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 7,650 companies tracked

RevenueBase identified 7,650 wastewater treatment plants worldwide as of September 2026 and tracks 123,917 professional contacts across them, including 28,150 with verified work emails. India is the largest market and Pune the largest hub.

This list covers wastewater treatment plants 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 22, 2026. Country and city lists for wastewater treatment plants 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 22, 2026 86% judged on-target in blind review

7,650Companies

123,917Contacts tracked

28,150Verified emails

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The 25 largest wastewater treatment plants worldwide

Ranked by team size

Top 25 of 7,650 wastewater treatment plants worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to wastewater treatment plants: 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	ION Exchange India LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 22, 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 22, 2026
2	VA Tech Wabag LTD	Indirect evidence	Wabag House, IndiaHQ checked Sep 22, 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 22, 2026
3	Carollo Engineers	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 22, 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 22, 2026
4	MPW Industrial Services	Indirect evidence	Hebron, OH, PalestineHQ checked Sep 22, 2026	1,001-5,000	1,485 contacts →
	Indirect evidence “As the leading provider of integrated, technology-based industrial cleaning, water purification, facility management, and total waste services in North America, MPW assists in…” Source: RevenueBase Database · checked Sep 22, 2026
5	Kurita Group	Indirect evidence	Tokyo, JapanHQ checked Sep 22, 2026	5,001-10,000	1,360 contacts →
	Indirect evidence “For more than 70 years, since its founding in 1949, Kurita Water Industries has been consistently operating in two areas of "water and the environment." Kurita Group provides…” Source: RevenueBase Database · checked Sep 22, 2026
6	Volvo Eicher Commerical Vehical Limited	Strong evidence	Dhar, IndiaHQ checked Sep 22, 2026	n/a	1,196 contacts →
	Strong 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 22, 2026
7	Aquatech	Indirect evidence	Canonsburg, PA, United StatesHQ checked Sep 22, 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 22, 2026
8	MWH Treatment	Partial evidence	Stockport, United KingdomHQ checked Sep 22, 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 22, 2026
9	OVIVO	Partial evidence	Montreal, QC, CanadaHQ checked Sep 22, 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 22, 2026
10	Gradiant	Indirect evidence	Woburn, MA, United StatesHQ checked Sep 22, 2026	1,001-5,000	813 contacts →
	Indirect evidence “Gradiant is a Different Kind of Water Company.” Source: RevenueBase Database · checked Sep 22, 2026
11	Trojan Technologies	Partial evidence	London, ON, CanadaHQ checked Sep 22, 2026	501-1,000	716 contacts →
	Partial evidence “Our Vision To continuously advance water treatment, ensuring everyone has access to clean water, globally.” Source: RevenueBase Database · checked Sep 22, 2026
12	Promotora Ambiental S.A.B. DE C.V	Indirect evidence	Santa María, MexicoHQ checked Sep 22, 2026	5,001-10,000	677 contacts →
	Indirect evidence “En Promotora Ambiental nos hemos especializado en brindar soluciones ambientales a los sectores público y privado, en los campos de comercio e industria.” Source: RevenueBase Database · checked Sep 22, 2026
13	Ward And Burke	Indirect evidence	Kilcolgan, IrelandHQ checked Sep 22, 2026	1,001-5,000	632 contacts →
	Indirect evidence “Since its establishment, Ward & Burke has sought to develop and adopt the ideals and aspirations to civil engineering construction and currently delivers class leading, reliable…” Source: RevenueBase Database · checked Sep 22, 2026
14	Cetrel	Indirect evidence	Camaçari, BrazilHQ checked Sep 22, 2026	1,001-5,000	611 contacts →
	Indirect evidence “Cetrel was formely created as an environmental protection company 40 years ago, to treat efluents and solid residues of more than 70 industries of the Camaçari Industrial Complex…” Source: RevenueBase Database · checked Sep 22, 2026
15	Nijhuis Saur Industries	Indirect evidence	Doetinchem, NetherlandsHQ checked Sep 22, 2026	1,001-5,000	609 contacts →
	Indirect evidence “Founded in 1904, Nijhuis Saur Industries provides solid and adaptive solutions for sustainable and resilient water use, energy- and resource recovery.” Source: RevenueBase Database · checked Sep 22, 2026
16	IDE Technologies	Partial evidence	Kadima, IsraelHQ checked Sep 22, 2026	501-1,000	603 contacts →
	Partial evidence “A world leader in water treatment solutions, IDE specializes in the development, engineering, construction and operation of enhanced desalination and industrial water treatment…” Source: RevenueBase Database · checked Sep 22, 2026
17	Westech Engineering	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 22, 2026	501-1,000	554 contacts →
	Strong evidence “WesTech Engineering, LLC designs, engineers, and manufactures water and wastewater treatment process equipment for mineral, industrial, and municipal applications worldwide.” Source: RevenueBase Database · checked Sep 22, 2026
18	AGS Water Solutions	Indirect evidence	Paço De Arcos, PortugalHQ checked Sep 22, 2026	51-200	502 contacts →
	Indirect evidence “AGS – Administração e Gestão de Sistemas de Salubridade, SA focuses on the preservation of the environment, acting throughout the entire water cycle.” Source: RevenueBase Database · checked Sep 22, 2026
19	RSE	Partial evidence	Inverness Highlands, United KingdomHQ checked Sep 22, 2026	501-1,000	498 contacts →
	Partial evidence “RSE is a trusted clean water technology company, developing market leading products and solutions for purifying drinking water, recycling wastewater and cleaning water in…” Source: RevenueBase Database · checked Sep 22, 2026
20	GS Inima Brasil	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 22, 2026	1,001-5,000	439 contacts →
	Indirect evidence “A GS Inima Brasil é uma das maiores e mais respeitadas companhias privadas de saneamento do país, oferecendo soluções inovadoras e integradas.” Source: RevenueBase Database · checked Sep 22, 2026
21	GMB	Indirect evidence	Opheusden, NetherlandsHQ checked Sep 22, 2026	501-1,000	435 contacts →
	Indirect evidence “Al ruim een halve eeuw zetten we ons in voor duurzame oplossingen op het gebied van waterkwaliteit, waterveiligheid, bio-energie en industriële bouw en infra.” Source: RevenueBase Database · checked Sep 22, 2026
22	Grupo EP	Indirect evidence	Guarulhos, BrazilHQ checked Sep 22, 2026	501-1,000	434 contacts →
	Indirect evidence “Identificamos e solucionamos problemas relacionados ao tratamento de água e efluentes, reúso, dessalinização e análises ambientais para indústrias, consultorias ambientais e…” Source: RevenueBase Database · checked Sep 22, 2026
23	Glanua	Partial evidence	Galway, IrelandHQ checked Sep 22, 2026	201-500	417 contacts →
	Partial evidence “Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build and deliver critical water and wastewater infrastructure across UK and…” Source: RevenueBase Database · checked Sep 22, 2026
24	Waterleau	Indirect evidence	Wespelaar, FranceHQ checked Sep 22, 2026	201-500	411 contacts →
	Indirect evidence “Waterleau is your partner in sustainable water stewardship.” Source: RevenueBase Database · checked Sep 22, 2026
25	UCC Environmental	Strong evidence	Waukegan, IL, United StatesHQ checked Sep 22, 2026	201-500	389 contacts →
	Strong evidence “UCC Environmental (UCC) is a global leader in environmental solutions for solids handling, wastewater treatment and pollution control technologies in power generation and other…” Source: RevenueBase Database · checked Sep 22, 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 plants. 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 plants.
Partial evidence: Its own public description names part of wastewater treatment plants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater treatment plants. 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 7,650 wastewater treatment plants worldwide

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Wastewater treatment plants worldwide at a glance

As of Sep 22, 2026

22.7%Verified-email coverage

16.2Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Pune

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

2,767

11-50

2,992

51-200

1,253

201-500

383

501-1,000

1,001-5,000

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 wastewater treatment plants, 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 wastewater treatment plants are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “wastewater treatment plants”. 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 plants), 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 plants, 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, 28,150 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 22, 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 plants by location

39 lists · largest first

Every Wastewater treatment plants 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 plants, 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 plants are there worldwide?

RevenueBase identified 7,650 wastewater treatment plants 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?

ION Exchange India LTD, headquartered in Mumbai, tops this list with the largest team on record.

Which country has the most wastewater treatment plants?

India leads with 1,159 companies, followed by the United States (866) and Brazil (433). Every wastewater treatment plants list by country and city is linked on this page.

Which city has the most wastewater treatment plants?

Pune leads with 112 headquartered companies, followed by Ahmedabad (89) and Chennai (79).

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 28,150 verified decision-maker contacts tracked across these 7,650 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 22, 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.