Company lists · Data refreshed September 2026
Top 25 Municipal water treatment providers based in the United States
RevenueBase identified 1,244 municipal water treatment providers headquartered in the United States as of September 2026 and tracks 33,250 professional contacts across them, including 13,659 with verified work emails. Houston is the largest hub.
This list covers municipal water treatment providers 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 20, 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.
The 25 largest municipal water treatment providers based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 2,876 contacts → | ||||
Partial evidence “American Water (NYSE: AWK) is the largest regulated water and wastewater utility company in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,434 contacts → | ||||
Strong evidence “East Bay Municipal Utility District is a California public utility that supplies high-quality drinking water, generates renewable energy and provides wastewater treatment and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 1,288 contacts → | ||||
Partial evidence “Established in 1918, WSSC Water is currently among the largest water and wastewater utilities in the nation, with a network of nearly miles of drinking water pipeline and over…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 931 contacts → | ||||
Partial evidence “Denver Water proudly serves high-quality water and promotes its efficient use to 1.5 million people in the city of Denver and many surrounding suburbs.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 864 contacts → | ||||
Indirect evidence “Chem-Aqua is a unique combination of knowledge, experience and stability.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 548 contacts → | ||||
Partial evidence “The Great Lakes Water Authority (GLWA) is a regional water and sewer authority that services nearly 40 percent of the water customers in Michigan On June 12, 2015, history was…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 365 contacts → | ||||
Strong evidence “Charlotte Water, operated by the City of Charlotte, is the municipal water & wastewater services provider for City of Charlotte, NC.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 330 contacts → | ||||
Strong evidence “The Inland Empire Utilities Agency (IEUA) is a municipal water district that supplies imported and recycled water; collects and treats wastewater; and provides other utility…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 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 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 300 contacts → | ||||
Partial evidence “Founded in 1866, San Jose Water is an investor owned public utility, and is one of the largest and most technically sophisticated urban water system in the United States.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 265 contacts → | ||||
Strong evidence “Culligan has over 80 years of experience in the design and distribution of water treatment systems for residential, commercial and industrial applications.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 256 contacts → | ||||
Partial evidence “Toho Water Authority was established in 2003 by a special act of the Florida legislature and provides a full range of water, wastewater and reclaimed water services to its…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 245 contacts → | ||||
Strong evidence “Metro Water Recovery in Denver, CO - a nationally recognized leader among clean water utilities, provides wastewater conveyance and treatment services for 2.2 million people who…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 242 contacts → | ||||
Indirect evidence “ALCOSAN is one of the Pittsburgh region’s premiere environmental and public health organizations, treating wastewater for 83 Allegheny County communities, including the City of…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 241 contacts → | ||||
Partial evidence “Rely on USABlueBook for everything you need for water and wastewater operations and maintenance.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 207 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 197 contacts → | ||||
Partial evidence “Phigenics is a leading provider of safe, smart, and superior water management programs aligned with ANSI/ASHRAE Standard 188 and Centers for Medicare & Medicaid Services (CMS) QSO…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 195 contacts → | ||||
Strong evidence “Formed in 2017 following the consolidation of independent water treatment solution providers Emefcy and RWL Water, Fluence Corporation was established with the vision of becoming…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 185 contacts → | ||||
Strong evidence “Newterra designs, engineers, manufactures, and services environmental, water and wastewater treatment solutions that assure great performance, superb reliability, and the highest…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 167 contacts → | ||||
Strong evidence “MWRA supplies some of the best drinking water in the country and provides wastewater treatment services to over 3 million people in eastern and central Massachusetts.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 156 contacts → | ||||
Partial evidence “Middlesex Water Company (NASDAQ:MSEX) provides a full range of regulated and non-regulated water, wastewater utility and related services primarily in New Jersey and Delaware.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
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: municipal water treatment providers. 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 municipal water treatment providers.
- Partial evidence
- Its own public description names part of municipal water treatment providers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name municipal water treatment providers. 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 1,244 municipal water treatment providers based in the United States
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Municipal water treatment providers based in the United States at a glance
As of Sep 20, 2026Companies by employee count
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 1,244 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 municipal water treatment providers, 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 “municipal water treatment providers”. 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 municipal water treatment providers), 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 municipal water treatment providers, 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, 13,659 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 20, 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.
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 municipal water treatment providers, 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 municipal water treatment providers are there based in the United States?
RevenueBase identified 1,244 municipal water treatment providers 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?
American Water, headquartered in Camden, tops this list with the largest team on record.
Which city has the most municipal water treatment providers?
Houston leads with 15 headquartered companies, followed by Phoenix (11) and Tampa (8).
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 13,659 verified decision-maker contacts tracked across these 1,244 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 20, 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.
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