Company lists · Data refreshed September 2026

Top 25 Wastewater management consultants worldwide

Name: Wastewater management consultants worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 11,931 companies tracked

RevenueBase identified 11,931 wastewater management consultants worldwide as of September 2026 and tracks 244,303 professional contacts across them, including 73,536 with verified work emails. The United States is the largest market and Pune the largest hub.

This list covers wastewater management consultants 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 wastewater management consultants 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

11,931Companies

244,303Contacts tracked

73,536Verified emails

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The 25 largest wastewater management consultants worldwide

Ranked by team size

Top 25 of 11,931 wastewater management consultants worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to wastewater management consultants: 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 29, 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 29, 2026
2	Tetra Tech	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 29, 2026	10001+	12,999 contacts →
	Indirect evidence “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Source: RevenueBase Database · checked Sep 29, 2026
3	XYLEM	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	10001+	9,320 contacts →
	Indirect 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 29, 2026
4	Pentair	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	5,001-10,000	6,636 contacts →
	Indirect evidence “At Pentair, we help the world sustainably move, improve, and enjoy water, life’s most essential resource.” 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	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
7	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
8	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
9	Carollo Engineers	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 29, 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 29, 2026
10	Freese And Nichols	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,496 contacts →
	Indirect evidence “Freese and Nichols is a professional planning, consulting and engineering firm serving clients across the United States.” Source: RevenueBase Database · checked Sep 29, 2026
11	DHI	Indirect evidence	Hørsholm, DenmarkHQ checked Sep 29, 2026	1,001-5,000	1,427 contacts →
	Indirect evidence “There is no substitute for water.” Source: RevenueBase Database · checked Sep 29, 2026
12	Aqualia	Indirect evidence	Madrid, SpainHQ checked Sep 29, 2026	5,001-10,000	1,395 contacts →
	Indirect evidence “Aqualia es la cuarta empresa de gestión del agua de Europa y la novena del Mundo por población servida, según el último ranking de Global Water Intelligence (diciembre de 2024).” Source: RevenueBase Database · checked Sep 29, 2026
13	Volvo Eicher Commerical Vehical Limited	Indirect evidence	Dhar, IndiaHQ checked Sep 29, 2026	n/a	1,196 contacts →
	Indirect 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 29, 2026
14	Barr Engineering CO	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,088 contacts →
	Indirect 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
15	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
16	Trinity Consultants	Partial evidence	Dallas, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	961 contacts →
	Partial evidence “Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…” Source: RevenueBase Database · checked Sep 29, 2026
17	MWH Treatment	Indirect evidence	Stockport, United KingdomHQ checked Sep 29, 2026	1,001-5,000	879 contacts →
	Indirect 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 29, 2026
18	ATC Group Services LLC	Indirect evidence	Lafayette, LA, United StatesHQ checked Sep 29, 2026	1,001-5,000	865 contacts →
	Indirect evidence “ATC Group Services LLC is now Atlas.” Source: RevenueBase Database · checked Sep 29, 2026
19	Binnies	Indirect evidence	Redhill, United KingdomHQ checked Sep 29, 2026	501-1,000	842 contacts →
	Indirect evidence “Together with our strategic partners, we can address everything from supporting vulnerable customers, water quality, asset performance and leak detection, to integrated planning…” Source: RevenueBase Database · checked Sep 29, 2026
20	OVIVO	Indirect evidence	Montreal, QC, CanadaHQ checked Sep 29, 2026	501-1,000	829 contacts →
	Indirect 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 29, 2026
21	Gradiant	Indirect evidence	Woburn, MA, United StatesHQ checked Sep 29, 2026	1,001-5,000	813 contacts →
	Indirect evidence “Gradiant is a Different Kind of Water Company.” Source: RevenueBase Database · checked Sep 29, 2026
22	Pares&alvarez	Indirect evidence	Santiago, ChileHQ checked Sep 29, 2026	501-1,000	807 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026
23	Antea Group - France	Indirect evidence	Olivet, FranceHQ checked Sep 29, 2026	1,001-5,000	737 contacts →
	Indirect evidence “Antea Group est une société internationale d’ingénierie et de conseil en environnement.” Source: RevenueBase Database · checked Sep 29, 2026
24	Promotora Ambiental S.A.B. DE C.V	Indirect evidence	Santa María, MexicoHQ checked Sep 29, 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 29, 2026
25	Ontario Clean Water Agency	Indirect evidence	Mississauga, ON, CanadaHQ checked Sep 29, 2026	501-1,000	662 contacts →
	Indirect evidence “Water is one of our most precious resources.” 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: wastewater management consultants. 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 management consultants.
Partial evidence: Its own public description names part of wastewater management consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater management consultants. 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 11,931 wastewater management consultants worldwide

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Wastewater management consultants worldwide at a glance

As of Sep 29, 2026

30.1%Verified-email coverage

20.5Average contacts per company

11-50Median size (employees)

1.0%Largest-city concentration · Pune

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

5,599

11-50

4,104

51-200

1,499

201-500

410

501-1,000

118

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 management consultants, 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 management consultants are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “wastewater management consultants”. 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 management consultants), 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 management consultants, 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, 73,536 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.

Wastewater management consultants by location

55 lists · largest first

Every Wastewater management consultants 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 management consultants, 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 management consultants are there worldwide?

RevenueBase identified 11,931 wastewater management consultants 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 management consultants?

The United States leads with 2,180 companies, followed by India (1,082) and Brazil (729). Every wastewater management consultants list by country and city is linked on this page.

Which city has the most wastewater management consultants?

Pune leads with 117 headquartered companies, followed by Tehran (93) and Sao Paulo (90).

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 73,536 verified decision-maker contacts tracked across these 11,931 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.