Company lists · Data refreshed November 2026

Top 25 Wastewater treatment engineers worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 8,599 companies tracked

RevenueBase identified 8,599 company matches for wastewater treatment engineers worldwide as of November 2026 and tracks 203,538 professional contacts across them, including 60,249 with verified work emails. The United States is the largest market and Pune the largest hub.

This list covers company matches for wastewater treatment engineers worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026. Country and city lists for wastewater treatment engineers follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

8,599Companies

203,538Contacts tracked

60,249Verified emails

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The 25 largest wastewater treatment engineers worldwide

Ranked by team size

Top 25 of 8,599 company matches for wastewater treatment engineers worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	SUEZ	Exact match	Paris, FranceHQ recorded Nov 6, 2026	10001+	23,115 contacts →
	Exact match “We provide essential services in the water and waste sectors to preserve resources and improve quality of life wherever we operate.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Tetra Tech	Exact match	Pasadena, CA, United StatesHQ recorded Nov 6, 2026	10001+	14,232 contacts →
	Exact match “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	CDM Smith	Exact match	Boston, MA, United StatesHQ recorded Nov 6, 2026	5,001-10,000	8,143 contacts →
	Exact match “CDM Smith is shaping what’s next, now, with world class solutions in water, environment, transportation and energy to public and private clients worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	ION Exchange India LTD	Exact match	Mumbai, IndiaHQ recorded Nov 6, 2026	1,001-5,000	4,010 contacts →
	Exact match “At Ion Exchange India, we bring you total environment solutions - water treatment, liquid waste treatment & recycle, air pollution control, solid & hazardous waste management and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	VA Tech Wabag LTD	Exact match	Wabag House, IndiaHQ recorded Nov 6, 2026	1,001-5,000	2,635 contacts →
	Exact match “WABAG, a global leader in the water industry, is backed by rich experience spanning over 100 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,553 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Hazen And Sawyer	Exact match	New York, CO, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,306 contacts →
	Exact match “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Carollo Engineers	Exact match	Walnut Creek, NV, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,837 contacts →
	Exact match “For more than 90 years, Carollo Engineers has been dedicated exclusively to water and wastewater solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	CHA Consulting, INC	Exact match	Albany, NH, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,780 contacts →
	Exact match “CHA Consulting, Inc.(CHA) is an innovative, full-service engineering, design, consulting, and program/construction management firm providing a wide range of technology-enhanced…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Volvo Eicher Commerical Vehical Limited	Exact match	Dhar, IndiaHQ recorded Nov 6, 2026	n/a	1,235 contacts →
	Exact match “Volvo Eicher Commerical Vehical Limited Service Provider of waste water recycling systems, drinking water plant & industrial water treatment in Indore, Madhya Pradesh.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Inframark	Exact match	Horsham, PA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,107 contacts →
	Exact match “As an Azuria owned company, Inframark is a widely recognized leader in Water Infrastructure Operations and Infrastructure Management Services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	MWH Treatment	Exact match	Stockport, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	971 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Pares&alvarez	Exact match	Santiago, ChileHQ recorded Nov 6, 2026	501-1,000	878 contacts →
	Exact match “We are Pares & Alvarez, our extensive experience and the recognition of our clients makes us one of the leading Engineering Companies in environmental, consulting, engineering and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Holding Company For Water And Waste Water Hcww	Exact match	Cairo, EgyptHQ recorded Nov 6, 2026	1,001-5,000	867 contacts →
	Exact match “Holding Company for Water and Waste Water is a Civil Engineering company located in Cairo Governorate, Egypt.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	OVIVO	Exact match	Montreal, QC, CanadaHQ recorded Nov 6, 2026	501-1,000	857 contacts →
	Exact match “Ovivo is a powerful global brand, uniting world-renowned trademarks and a highly specialized team of 700 water treatment experts operating across the globe.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Antea Group - France	Exact match	Olivet, FranceHQ recorded Nov 6, 2026	1,001-5,000	824 contacts →
	Exact match “Antea Group est une société internationale d’ingénierie et de conseil en environnement.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Parlym	Exact match	Estaque, FranceHQ recorded Nov 6, 2026	1,001-5,000	801 contacts →
	Exact match “For over 50 years the Parlym Group has managed to establish itself as a major player in industrial engineering all over the world.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Hatch Mott Macdonald	Exact match	Iselin, NJ, United StatesHQ recorded Nov 6, 2026	1,001-5,000	800 contacts →
	Exact match “This page is now closed.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Ward And Burke	Exact match	Kilcolgan, TX, IrelandHQ recorded Nov 6, 2026	1,001-5,000	731 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Neel-Schaffer, INC	Exact match	Jackson, MS, United StatesHQ recorded Nov 6, 2026	501-1,000	637 contacts →
	Exact match “Neel-Schaffer is a multi-disciplined engineering, planning and construction management firm that was founded in 1983 and today is one of the largest private, employee-owned…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Kennedy Jenks	Exact match	San Francisco, CA, United StatesHQ recorded Nov 6, 2026	201-500	593 contacts →
	Exact match “For over 100 years, Kennedy Jenks has provided engineering and scientific solutions for innovative water and environmental projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Nijhuis Saur Industries	Exact match	Doetinchem, NetherlandsHQ recorded Nov 6, 2026	1,001-5,000	592 contacts →
	Exact match “Founded in 1904, Nijhuis Saur Industries provides solid and adaptive solutions for sustainable and resilient water use, energy- and resource recovery.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Westech Engineering	Exact match	Salt Lake City, United StatesHQ recorded Nov 6, 2026	501-1,000	588 contacts →
	Exact match “WesTech Engineering, LLC designs, engineers, and manufactures water and wastewater treatment process equipment for mineral, industrial, and municipal applications worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Engicon	Exact match	Amman, JordanHQ recorded Nov 6, 2026	501-1,000	577 contacts →
	Exact match “Engicon is a multidisciplinary consulting engineering firm based in Amman.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	AGS Water Solutions	Exact match	Oeiras, PortugalHQ recorded Nov 6, 2026	51-200	542 contacts →
	Exact match “AGS – Administração e Gestão de Sistemas de Salubridade, SA focuses on the preservation of the environment, acting throughout the entire water cycle.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “wastewater treatment engineers”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 8,599 wastewater treatment engineers worldwide

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Wastewater treatment engineers worldwide at a glance

As of Nov 6, 2026

29.6%Verified-email coverage

23.7Average contacts per company

11-50Median size (employees)

1.0%Largest-city concentration · Pune

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

3,411

11-50

3,214

51-200

1,287

201-500

361

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

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for wastewater treatment engineers are linked below.
What qualifies: Company records worldwide whose business descriptions match “wastewater treatment engineers” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 60,249 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Wastewater treatment engineers by location

44 lists · largest first

Every Wastewater treatment engineers 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “wastewater treatment engineers”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many wastewater treatment engineers are there worldwide?

RevenueBase identified 8,599 company matches for wastewater treatment engineers worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

SUEZ tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most wastewater treatment engineers?

The United States leads with 1,526 companies, followed by India (904) and Brazil (501). Every wastewater treatment engineers list by country and city is linked on this page.

Which city has the most wastewater treatment engineers?

Pune leads with 88 company records, followed by Tehran (77) and Sao Paulo (68).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 60,249 professional contacts with verified work emails tracked across these 8,599 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.