Company lists · Data refreshed September 2026

Top 25 Sustainable water supply companies based in the United States

Name: Sustainable water supply companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 1,411 companies tracked

RevenueBase identified 1,411 sustainable water supply companies headquartered in the United States as of September 2026 and tracks 95,497 professional contacts across them, including 36,156 with verified work emails. Houston is the largest hub.

This list covers sustainable water supply companies headquartered in the United States, 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.

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

1,411Companies

95,497Contacts tracked

36,156Verified emails

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The 25 largest sustainable water supply companies based in the United States

Ranked by team size

Top 25 of 1,411 sustainable water supply companies based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable water supply 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	Ecolab	Strong evidence	St. Paul, MN, United StatesHQ checked Sep 22, 2026	10001+	31,345 contacts →
	Strong evidence “A trusted partner for millions of customers, Ecolab (NYSE:ECL) is a global sustainability leader offering water, hygiene and infection prevention solutions and services that…” Source: RevenueBase Database · checked Sep 22, 2026
2	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
3	NCH	Partial evidence	Wilmington, DE, United StatesHQ checked Sep 22, 2026	10001+	2,361 contacts →
	Partial evidence “Cleaning water, conserving energy and delivering maintenance solutions since 1919.” Source: RevenueBase Database · checked Sep 22, 2026
4	Culligan International	Partial evidence	Rosemont, IL, United StatesHQ checked Sep 22, 2026	10001+	1,830 contacts →
	Partial evidence “There’s nothing more fundamental to life on Earth than water.” Source: RevenueBase Database · checked Sep 22, 2026
5	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
6	AQUA	Partial evidence	Bryn Mawr, PA, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,478 contacts →
	Partial evidence “Aqua is one of the largest U.S-based, publicly traded water and wastewater utilities, serving more than 3 million people in Illinois, Indiana, New Jersey, North Carolina…” Source: RevenueBase Database · checked Sep 22, 2026
7	Chemtreat	Partial evidence	Glen Allen, VA, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,404 contacts →
	Partial evidence “At ChemTreat, we understand that water is a vital resource for our planet.” Source: RevenueBase Database · checked Sep 22, 2026
8	Zurn Elkay Water Solutions	Strong evidence	Milwaukee, WI, United StatesHQ checked Sep 22, 2026	1,001-5,000	1,127 contacts →
	Strong evidence “Zurn Elkay Water Solutions supplies the industry’s widest range of clean water solutions for drinking water, hygiene and sustainable water management.” Source: RevenueBase Database · checked Sep 22, 2026
9	Inframark	Partial evidence	Horsham, PA, United StatesHQ checked Sep 22, 2026	1,001-5,000	973 contacts →
	Partial evidence “As an Azuria owned company, Inframark is a widely recognized leader in Water Infrastructure Operations and Infrastructure Management Services.” Source: RevenueBase Database · checked Sep 22, 2026
10	Aquatech	Partial evidence	Canonsburg, PA, United StatesHQ checked Sep 22, 2026	501-1,000	903 contacts →
	Partial 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
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	Gradiant	Partial evidence	Woburn, MA, United StatesHQ checked Sep 22, 2026	1,001-5,000	813 contacts →
	Partial evidence “Gradiant is a Different Kind of Water Company.” Source: RevenueBase Database · checked Sep 22, 2026
13	Westech Engineering	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 22, 2026	501-1,000	554 contacts →
	Partial 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
14	Rockwater Energy Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	201-500	519 contacts →
	Indirect evidence “Rockwater is now Select Chemistry.” Source: RevenueBase Database · checked Sep 22, 2026
15	Dupont Water Solutions	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 22, 2026	10001+	470 contacts →
	Indirect evidence “We’re helping companies in every industry, in every corner of the globe make real progress.” Source: RevenueBase Database · checked Sep 22, 2026
16	Louisville Water Company	Partial evidence	Louisville, KY, United StatesHQ checked Sep 22, 2026	201-500	413 contacts →
	Partial evidence “Every day, nearly one million people depend on Louisville Water Company to provide safe, high-quality drinking water.” Source: RevenueBase Database · checked Sep 22, 2026
17	Culligan Water	Strong evidence	Jacksonville, FL, United StatesHQ checked Sep 22, 2026	51-200	354 contacts →
	Strong evidence “At Culligan Water Conditioning of Jacksonville FL, we not only aim to provide better water to the community, we are also committed to building a better, more sustainable world.” Source: RevenueBase Database · checked Sep 22, 2026
18	Parkson Corporation	Strong evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 22, 2026	51-200	317 contacts →
	Strong evidence “Parkson Corporation is a supplier of innovative, cost effective solutions for potable water, process water, and industrial and municipal wastewater treatment.” Source: RevenueBase Database · checked Sep 22, 2026
19	Aquarion Water Company	Strong evidence	Bridgeport, CT, United StatesHQ checked Sep 22, 2026	201-500	308 contacts →
	Strong evidence “Aquarion Water Company is the public water supply and wastewater treatment company for more than people in 73 cities and towns in Connecticut, Massachusetts and New Hampshire.” Source: RevenueBase Database · checked Sep 22, 2026
20	Infiltrator Water Technologies Decentralized Wastewater Treatment Solutions	Indirect evidence	Old Saybrook, CT, United StatesHQ checked Sep 22, 2026	501-1,000	295 contacts →
	Indirect evidence “Protecting the environment with innovative wastewater treatment solutions for over 35 years, Infiltrator is the leading manufacturer of onsite wastewater treatment products in…” Source: RevenueBase Database · checked Sep 22, 2026
21	Keystone Clearwater Solutions	Partial evidence	Hershey, PA, United StatesHQ checked Sep 22, 2026	501-1,000	268 contacts →
	Partial evidence “Keystone Clearwater Solutions is moving water forward with engineered solutions for safer, more efficient water transfer, water management, and environmental services.” Source: RevenueBase Database · checked Sep 22, 2026
22	Valicor	Partial evidence	Monroe, OH, United StatesHQ checked Sep 22, 2026	201-500	254 contacts →
	Partial evidence “Valicor is a trusted partner for sustainable waste management solutions.” Source: RevenueBase Database · checked Sep 22, 2026
23	Chemsearch FE	Partial evidence	Irving, TX, United StatesHQ checked Sep 22, 2026	1,001-5,000	251 contacts →
	Partial evidence “Chemsearch FE’s mission is simple-to help facilities save water, energy and reduce operating costs.” Source: RevenueBase Database · checked Sep 22, 2026
24	Prominent North America	Partial evidence	Pit, United StatesHQ checked Sep 22, 2026	201-500	251 contacts →
	Partial evidence “ProMinent North America is part of the global ProMinent Group, a pioneer in metering technology and water treatment solutions with roots in Heidelberg, Germany.” Source: RevenueBase Database · checked Sep 22, 2026
25	Usabluebook	Partial evidence	Waukegan, IL, United StatesHQ checked Sep 22, 2026	5,001-10,000	241 contacts →
	Partial evidence “Rely on USABlueBook for everything you need for water and wastewater operations and maintenance.” 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: sustainable water supply 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 sustainable water supply companies.
Partial evidence: Its own public description names part of sustainable water supply companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable water supply 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 1,411 sustainable water supply companies based in the United States

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Sustainable water supply companies based in the United States at a glance

As of Sep 22, 2026

37.9%Verified-email coverage

67.7Average contacts per company

11-50Median size (employees)

2.4%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

568

11-50

521

51-200

208

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,411 companies.

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 sustainable water supply 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “sustainable water supply 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 sustainable water supply 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 sustainable water supply companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 36,156 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.

Sustainable water supply companies by metro

Sustainable water supply companies in Houston34

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 sustainable water supply 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 sustainable water supply companies are there based in the United States?

RevenueBase identified 1,411 sustainable water supply companies headquartered in the United States 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?

Ecolab, headquartered in St. Paul, tops this list with the largest team on record.

Which city has the most sustainable water supply companies?

Houston leads with 34 headquartered companies, followed by Los Angeles (13) and New York (12).

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 36,156 verified decision-maker contacts tracked across these 1,411 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.