Company lists · Data refreshed September 2026

Top 25 Wastewater treatment technology companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 11,300 companies tracked

RevenueBase identified 11,300 wastewater treatment technology companies worldwide as of September 2026 and tracks 155,420 professional contacts across them, including 40,706 with verified work emails. The United States is the largest market and Pune the largest hub.

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

11,300Companies

155,420Contacts tracked

40,706Verified emails

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The 25 largest wastewater treatment technology companies worldwide

Ranked by team size

Top 25 of 11,300 wastewater treatment technology companies 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 technology 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	XYLEM	Partial evidence	Washington, DC, United StatesHQ checked Sep 22, 2026	10001+	9,320 contacts →
	Partial evidence “Xylem is the global leader in advanced technologies, solutions and services that address the world’s biggest water challenges.” Source: RevenueBase Database · checked Sep 22, 2026
2	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
3	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
4	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
5	Select Water Solutions	Partial evidence	Gainesville, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,605 contacts →
	Partial evidence “Select is a leader in water management and chemical technology to our customers in the oil and gas industry, as well as in other industrial applications.” Source: RevenueBase Database · checked Sep 22, 2026
6	Chemtreat	Indirect evidence	Glen Allen, VA, United StatesHQ checked Sep 22, 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 22, 2026
7	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
8	Volvo Eicher Commerical Vehical Limited	Partial evidence	Dhar, IndiaHQ checked Sep 22, 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 22, 2026
9	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
10	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
11	Chem-Aqua, INC	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 22, 2026	10001+	864 contacts →
	Indirect evidence “Chem-Aqua is a unique combination of knowledge, experience and stability.” Source: RevenueBase Database · checked Sep 22, 2026
12	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
13	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
14	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
15	ACO Group	Indirect evidence	Büdelsdorf, GermanyHQ checked Sep 22, 2026	5,001-10,000	710 contacts →
	Indirect evidence “ACO is a Water-Tech company that protects water.” Source: RevenueBase Database · checked Sep 22, 2026
16	Grupo Bauminas	Indirect evidence	Cataguazes, BrazilHQ checked Sep 22, 2026	1,001-5,000	650 contacts →
	Indirect evidence “Sobre a BAUMINAS Fundada há mais de 60 anos, a BAUMINAS é uma empresa orgulhosamente nacional, com ampla experiência na fabricação de produtos para o tratamento de águas e tem…” Source: RevenueBase Database · checked Sep 22, 2026
17	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
18	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
19	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
20	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
21	BWT France	Strong evidence	Saint - Denis, FranceHQ checked Sep 22, 2026	501-1,000	567 contacts →
	Strong evidence “BWT France is one of the largest subsidiaries of Austrian group Best Water Technology ( BWT), the European leader in water treatment.” Source: RevenueBase Database · checked Sep 22, 2026
22	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
23	Rochem Separation Systems India Pvt. LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 22, 2026	1,001-5,000	536 contacts →
	Partial evidence “We as, Rochem Separation Systems offer 100% water reuse solutions to treat industrial wastewater since 1992.” Source: RevenueBase Database · checked Sep 22, 2026
24	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
25	RSE	Strong evidence	Inverness Highlands, United KingdomHQ checked Sep 22, 2026	501-1,000	498 contacts →
	Strong 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

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 technology 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 technology companies.
Partial evidence: Its own public description names part of wastewater treatment technology 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 technology 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 11,300 wastewater treatment technology companies worldwide

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Wastewater treatment technology companies worldwide at a glance

As of Sep 22, 2026

26.2%Verified-email coverage

13.8Average contacts per company

11-50Median size (employees)

1.1%Largest-city concentration · Pune

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

4,690

11-50

4,278

51-200

1,596

201-500

422

501-1,000

121

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 technology 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: Every country. Country and city lists for wastewater treatment technology companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “wastewater treatment technology 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 technology 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 technology 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, 40,706 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 technology companies by location

43 lists · largest first

Every Wastewater treatment technology 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 technology 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 technology companies are there worldwide?

RevenueBase identified 11,300 wastewater treatment technology 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?

XYLEM, headquartered in Washington, tops this list with the largest team on record.

Which country has the most wastewater treatment technology companies?

The United States leads with 1,787 companies, followed by India (1,373) and Brazil (512). Every wastewater treatment technology companies list by country and city is linked on this page.

Which city has the most wastewater treatment technology companies?

Pune leads with 128 headquartered companies, followed by Chennai (105) and Ahmedabad (101).

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 40,706 verified decision-maker contacts tracked across these 11,300 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.