Company lists · Data refreshed September 2026

Top 25 Reverse osmosis system suppliers based in the United States

Name: Reverse osmosis system suppliers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 919 companies tracked

RevenueBase identified 919 reverse osmosis system suppliers headquartered in the United States as of September 2026 and tracks 9,405 professional contacts across them, including 2,964 with verified work emails. Houston is the largest hub.

This list covers reverse osmosis system suppliers 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 21, 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 21, 2026 86% judged on-target in blind review

919Companies

9,405Contacts tracked

2,964Verified emails

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The 25 largest reverse osmosis system suppliers based in the United States

Ranked by team size

Top 25 of 919 reverse osmosis system suppliers based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to reverse osmosis system suppliers: 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	Westech Engineering	Indirect evidence	Salt Lake City, UT, United StatesHQ checked Sep 21, 2026	501-1,000	554 contacts →
	Indirect 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 21, 2026
2	Packard Culligan Water	Indirect evidence	Minnetonka, MN, United StatesHQ checked Sep 21, 2026	501-1,000	272 contacts →
	Indirect evidence “Packard Culligan Water is a family-owned company with values based on relationships, unity, listening, and leading locally.” Source: RevenueBase Database · checked Sep 21, 2026
3	Culligan By Waterco	Partial evidence	Lombard, IL, United StatesHQ checked Sep 21, 2026	501-1,000	265 contacts →
	Partial 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 21, 2026
4	Aqua-Chem	Indirect evidence	Knoxville, TN, United StatesHQ checked Sep 21, 2026	201-500	152 contacts →
	Indirect evidence “Aqua-Chem is the leader in providing Global Water Solutions.” Source: RevenueBase Database · checked Sep 21, 2026
5	Pureflow, INC	Indirect evidence	Graham, NC, United StatesHQ checked Sep 21, 2026	51-200	94 contacts →
	Indirect evidence “Why Pureflow?” Source: RevenueBase Database · checked Sep 21, 2026
6	Puretec Industrial Water	Indirect evidence	Oxnard, CA, United StatesHQ checked Sep 21, 2026	51-200	91 contacts →
	Indirect evidence “Puretec provides water treatment solutions that transform incoming city water into highly purified deionized water suitable for hundreds of industrial applications across dozens…” Source: RevenueBase Database · checked Sep 21, 2026
7	Samco Technologies	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 21, 2026	51-200	82 contacts →
	Indirect evidence “At SAMCO Technologies, Inc, we provide cutting-edge water, wastewater, and process separation solutions for some of the world’s most demanding industries, including power…” Source: RevenueBase Database · checked Sep 21, 2026
8	Water & Wastewater Equipment Company	Indirect evidence	Cleveland, OH, United StatesHQ checked Sep 21, 2026	11-50	80 contacts →
	Indirect evidence “Water and Wastewater Equipment Company has been providing efficient, cost-effective and compliant solutions to water and wastewater treatment applications for over 30 years.” Source: RevenueBase Database · checked Sep 21, 2026
9	FEDCO	Strong evidence	Monroe, MI, United StatesHQ checked Sep 21, 2026	51-200	79 contacts →
	Strong evidence “FEDCO is a global leader in the manufacture and sale of pumps and energy recovery devices (ERDs) for brackish and seawater reverse osmosis (RO) desalination systems.” Source: RevenueBase Database · checked Sep 21, 2026
10	Total Water Treatment Systems INC	Indirect evidence	Madison, WI, United StatesHQ checked Sep 21, 2026	51-200	77 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
11	Marlo Incorporated	Indirect evidence	Racine, WI, United StatesHQ checked Sep 21, 2026	51-200	62 contacts →
	Indirect evidence “For 50 years, Marlo Incorporated has engineered and manufactured high quality water treatment equipment for a wide variety of residential, commercial, and industrial applications.” Source: RevenueBase Database · checked Sep 21, 2026
12	Wigen Water Technologies	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	51-200	62 contacts →
	Partial evidence “Founded in 1965, Wigen Water Technologies® is a global leader in the production of custom water treatment systems, specializing in cost-effective and reliable solutions for…” Source: RevenueBase Database · checked Sep 21, 2026
13	Kinetico Advanced Water Systems	Partial evidence	Garner, NC, United StatesHQ checked Sep 21, 2026	51-200	62 contacts →
	Partial evidence “Kinetico Advanced Water Systems helps you understand and fix your water issues through custom analysis and tailored solutions.” Source: RevenueBase Database · checked Sep 21, 2026
14	Emco Group	Indirect evidence	Canton, MA, United StatesHQ checked Sep 21, 2026	51-200	60 contacts →
	Indirect evidence “EMCO Group is a well-established company with over 44 years of experience in the water and wastewater treatment industry.” Source: RevenueBase Database · checked Sep 21, 2026
15	Ameriwater	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 21, 2026	51-200	59 contacts →
	Indirect evidence “AmeriWater is the recognized specialist in the design, manufacturing, installation and supply of water treatment equipment and services.” Source: RevenueBase Database · checked Sep 21, 2026
16	Watertectonics	Indirect evidence	Everett, WA, United StatesHQ checked Sep 21, 2026	11-50	59 contacts →
	Indirect evidence “Established in WaterTectonics designs, manufactures, deploys and services integrated water treatment solutions for clients in oil & gas, mining, industrial and construction…” Source: RevenueBase Database · checked Sep 21, 2026
17	Kemco Systems	Partial evidence	Clearwater, FL, United StatesHQ checked Sep 21, 2026	51-200	55 contacts →
	Partial evidence “Kemco Systems, a CECO Environmental Brand, designs and manufactures energy and water conservation systems for Water Reuse/Recycle, Wastewater Treatment, Wastewater Filtration…” Source: RevenueBase Database · checked Sep 21, 2026
18	Clear Creek Systems	Partial evidence	Bakersfield, CA, United StatesHQ checked Sep 21, 2026	51-200	54 contacts →
	Partial evidence “Clear Creek Systems is a leading provider of water treatment systems and services.” Source: RevenueBase Database · checked Sep 21, 2026
19	The U.S. Water Culligan Group	Indirect evidence	Wheeling, IL, United StatesHQ checked Sep 21, 2026	201-500	53 contacts →
	Indirect evidence “The U.S.” Source: RevenueBase Database · checked Sep 21, 2026
20	Charger Water Treatment Products	Indirect evidence	Morton Grove, IL, United StatesHQ checked Sep 21, 2026	51-200	51 contacts →
	Indirect evidence “No matter what your water problem, Charger Water Treatment Products has a solution.” Source: RevenueBase Database · checked Sep 21, 2026
21	Puronics	Partial evidence	Livermore, CA, United StatesHQ checked Sep 21, 2026	51-200	51 contacts →
	Partial evidence “Manufacturer of a complete line of water treatment systems for homes and businesses.” Source: RevenueBase Database · checked Sep 21, 2026
22	Advantage Controls	Indirect evidence	Muskogee, OK, United StatesHQ checked Sep 21, 2026	51-200	50 contacts →
	Indirect evidence “Advantage Controls was founded in 1994 with the basic belief in providing exceptional value to our customers and to treat them and our team members like family.” Source: RevenueBase Database · checked Sep 21, 2026
23	Weas Engineering	Indirect evidence	Westfield, IN, United StatesHQ checked Sep 21, 2026	51-200	49 contacts →
	Indirect evidence “Weas Engineering, Inc.” Source: RevenueBase Database · checked Sep 21, 2026
24	TSG Water Resources, INC	Indirect evidence	Gainesville, FL, United StatesHQ checked Sep 21, 2026	11-50	49 contacts →
	Indirect evidence “We Design, Manufacture & Operate Water and Wastewater Treatment Plants.” Source: RevenueBase Database · checked Sep 21, 2026
25	Applied Membranes INC	Indirect evidence	Vista, CA, United StatesHQ checked Sep 21, 2026	201-500	46 contacts →
	Indirect evidence “Global water technology solutions provider since 1983.” Source: RevenueBase Database · checked Sep 21, 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: reverse osmosis system suppliers. 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 reverse osmosis system suppliers.
Partial evidence: Its own public description names part of reverse osmosis system suppliers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name reverse osmosis system suppliers. 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 919 reverse osmosis system suppliers based in the United States

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Reverse osmosis system suppliers based in the United States at a glance

As of Sep 21, 2026

31.5%Verified-email coverage

10.2Average contacts per company

1-10Median size (employees)

1.8%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

458

11-50

321

51-200

201-500

501-1,000

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 919 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 reverse osmosis system suppliers, 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 “reverse osmosis system suppliers”. 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 reverse osmosis system suppliers), 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 reverse osmosis system suppliers, 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, 2,964 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 21, 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 reverse osmosis system suppliers, 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 reverse osmosis system suppliers are there based in the United States?

RevenueBase identified 919 reverse osmosis system suppliers 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?

Westech Engineering, headquartered in Salt Lake City, tops this list with the largest team on record.

Which city has the most reverse osmosis system suppliers?

Houston leads with 17 headquartered companies, followed by Miami (8) and San Diego (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 2,964 verified decision-maker contacts tracked across these 919 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 21, 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.