Company lists · Data refreshed September 2026

Top 25 Water efficiency consulting firms worldwide

Name: Water efficiency consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 4,815 companies tracked

RevenueBase identified 4,815 water efficiency consulting firms worldwide as of September 2026 and tracks 100,557 professional contacts across them, including 34,015 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers water efficiency consulting firms 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 water efficiency consulting firms 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

4,815Companies

100,557Contacts tracked

34,015Verified emails

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The 25 largest water efficiency consulting firms worldwide

Ranked by team size

Top 25 of 4,815 water efficiency consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to water efficiency consulting firms: 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	Partial evidence	Paris, FranceHQ checked Sep 29, 2026	10001+	21,549 contacts →
	Partial 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	Partial evidence	Pasadena, CA, United StatesHQ checked Sep 29, 2026	10001+	12,999 contacts →
	Partial 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	Pentair	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	5,001-10,000	6,636 contacts →
	Partial 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
4	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
5	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
6	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
7	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
8	Binnies	Partial evidence	Redhill, United KingdomHQ checked Sep 29, 2026	501-1,000	842 contacts →
	Partial 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
9	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
10	Integral S.A. Ingenieros Consultores	Indirect evidence	Medellín \| Bogotá \| Lima \| Miami \| Nueva Delhi, ColombiaHQ checked Sep 29, 2026	1,001-5,000	709 contacts →
	Indirect evidence “Over six decades offering our consultancy services locally and internationally, based on ethical principles and commitments, always through honest, socially responsible actions…” Source: RevenueBase Database · checked Sep 29, 2026
11	Nijhuis Saur Industries	Partial evidence	Doetinchem, NetherlandsHQ checked Sep 29, 2026	1,001-5,000	609 contacts →
	Partial 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 29, 2026
12	AGS Water Solutions	Partial evidence	Paço De Arcos, PortugalHQ checked Sep 29, 2026	51-200	502 contacts →
	Partial 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 29, 2026
13	Grupo EP	Indirect evidence	Guarulhos, BrazilHQ checked Sep 29, 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 29, 2026
14	Waterleau	Partial evidence	Wespelaar, FranceHQ checked Sep 29, 2026	201-500	411 contacts →
	Partial evidence “Waterleau is your partner in sustainable water stewardship.” Source: RevenueBase Database · checked Sep 29, 2026
15	Hyflux LTD	Partial evidence	SingaporeHQ checked Sep 29, 2026	1,001-5,000	389 contacts →
	Partial evidence “Hyflux is a global leader in environmental solutions, focusing on the areas of water and energy.” Source: RevenueBase Database · checked Sep 29, 2026
16	Baxter & Woodman	Indirect evidence	Crystal Lake, IL, United StatesHQ checked Sep 29, 2026	201-500	385 contacts →
	Indirect evidence “Founded in 1946, Baxter & Woodman, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
17	P2s	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 29, 2026	201-500	375 contacts →
	Indirect evidence “P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.” Source: RevenueBase Database · checked Sep 29, 2026
18	Proxa Water	Partial evidence	Woodmead, South AfricaHQ checked Sep 29, 2026	201-500	358 contacts →
	Partial evidence “Proxa is a leading water treatment specialist whose integrated services cover the entire water cycle and span numerous global industries, including: mining, food & beverage…” Source: RevenueBase Database · checked Sep 29, 2026
19	L&t	Partial evidence	Chennai, IndiaHQ checked Sep 29, 2026	5,001-10,000	350 contacts →
	Partial evidence “L&T Construction's Water & Effluent Treatment business vertical provides state-of-the-art design, detailed engineering, procurement, project management, project execution…” Source: RevenueBase Database · checked Sep 29, 2026
20	Ae2s Advanced Engineering And Environmental Services, LLC	Partial evidence	Grand Forks, ND, United StatesHQ checked Sep 29, 2026	201-500	339 contacts →
	Partial evidence “AE2S is a specialized civil/environmental consulting engineering firm that provides professional services and our unique brand of extreme client service to clients in the upper…” Source: RevenueBase Database · checked Sep 29, 2026
21	Enfil S A	Indirect evidence	São Paulo, BrazilHQ checked Sep 29, 2026	1,001-5,000	307 contacts →
	Indirect evidence “Com mais de 30 anos de atuação no mercado brasileiro, a Enfil é uma empresa referência em soluções ambientais para tratamento de água, efluentes e controle de emissões…” Source: RevenueBase Database · checked Sep 29, 2026
22	Ticsa Grupo EPM	Indirect evidence	Tlacoquemécatl, MexicoHQ checked Sep 29, 2026	501-1,000	305 contacts →
	Indirect evidence “En TICSA ofrecemos conocimiento y experiencia para crear soluciones innovadoras para el diseño, construcción, operación y mantenimiento de plantas de tratamiento de agua que den…” Source: RevenueBase Database · checked Sep 29, 2026
23	Cascade Energy	Indirect evidence	Portland, OR, United StatesHQ checked Sep 29, 2026	201-500	288 contacts →
	Indirect evidence “At Cascade Energy, we believe in better.” Source: RevenueBase Database · checked Sep 29, 2026
24	GKW Consult	Indirect evidence	Mannheim, GermanyHQ checked Sep 29, 2026	201-500	282 contacts →
	Indirect evidence “GKW Consult GmbH, a company of GFA Group, has developed and implemented projects and advisory services for public and private clients for 70 years in more than 50 countries…” Source: RevenueBase Database · checked Sep 29, 2026
25	West Yost	Strong evidence	Davis, CA, United StatesHQ checked Sep 29, 2026	201-500	279 contacts →
	Strong evidence “West Yost is a water-focused consulting engineering firm ranked by Fortune Magazine as one of the “Best Small and Medium Workplaces in Consulting and Professional Services” 2023 -…” 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: water efficiency consulting firms. 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 water efficiency consulting firms.
Partial evidence: Its own public description names part of water efficiency consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water efficiency consulting firms. 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 4,815 water efficiency consulting firms worldwide

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Water efficiency consulting firms worldwide at a glance

As of Sep 29, 2026

33.8%Verified-email coverage

20.9Average contacts per company

1-10Median size (employees)

1.0%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

2,772

11-50

1,463

51-200

401

201-500

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 water efficiency consulting firms, 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 water efficiency consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “water efficiency consulting firms”. 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 water efficiency consulting firms), 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 water efficiency consulting firms, 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, 34,015 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.

Water efficiency consulting firms by location

25 lists · largest first

Every Water efficiency consulting firms 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 water efficiency consulting firms, 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 water efficiency consulting firms are there worldwide?

RevenueBase identified 4,815 water efficiency consulting firms 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 water efficiency consulting firms?

The United States leads with 903 companies, followed by Brazil (332) and India (305). Every water efficiency consulting firms list by country and city is linked on this page.

Which city has the most water efficiency consulting firms?

Sao Paulo leads with 48 headquartered companies, followed by Santiago (32) and Pune (31).

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 34,015 verified decision-maker contacts tracked across these 4,815 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.