Company lists · Data refreshed September 2026

Top 25 Reverse osmosis membrane manufacturers based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 522 companies tracked

RevenueBase identified 522 reverse osmosis membrane manufacturers headquartered in the United States as of September 2026 and tracks 6,387 professional contacts across them, including 1,598 with verified work emails. Houston is the largest hub.

This list covers reverse osmosis membrane manufacturers 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 30, 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 30, 2026 86% judged on-target in blind review

522Companies

6,387Contacts tracked

1,598Verified emails

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The 25 largest reverse osmosis membrane manufacturers based in the United States

Ranked by team size

Top 25 of 522 reverse osmosis membrane manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to reverse osmosis membrane manufacturers: 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	Aquatech	Indirect evidence	Canonsburg, PA, United StatesHQ checked Sep 30, 2026	501-1,000	903 contacts →
	Indirect 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 30, 2026
2	Culligan By Waterco	Indirect evidence	Lombard, IL, United StatesHQ checked Sep 30, 2026	501-1,000	265 contacts →
	Indirect 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 30, 2026
3	Membrane Solutions	Partial evidence	Auburn, WA, United StatesHQ checked Sep 30, 2026	501-1,000	168 contacts →
	Partial evidence “Membrane Solutions, founded in 2006 in Seattle, USA, is a world-renowned supplier of membrane filtration products.” Source: RevenueBase Database · checked Sep 30, 2026
4	Pureflow, INC	Indirect evidence	Graham, NC, United StatesHQ checked Sep 30, 2026	51-200	94 contacts →
	Indirect evidence “Why Pureflow?” Source: RevenueBase Database · checked Sep 30, 2026
5	Puretec Industrial Water	Indirect evidence	Oxnard, CA, United StatesHQ checked Sep 30, 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 30, 2026
6	Samco Technologies	Indirect evidence	Buffalo, NY, United StatesHQ checked Sep 30, 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 30, 2026
7	FEDCO	Strong evidence	Monroe, MI, United StatesHQ checked Sep 30, 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 30, 2026
8	Total Water Treatment Systems INC	Indirect evidence	Madison, WI, United StatesHQ checked Sep 30, 2026	51-200	77 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
9	Paragon Water Systems INC	Partial evidence	Tampa, FL, United StatesHQ checked Sep 30, 2026	201-500	73 contacts →
	Partial evidence “Paragon Water Systems partners with appliance brands, foodservice operators, and industrial companies that require a reliable, scalable ODM/OEM water filtration manufacturer.” Source: RevenueBase Database · checked Sep 30, 2026
10	Complete Filtration Resources, INC	Strong evidence	Marshfield, WI, United StatesHQ checked Sep 30, 2026	11-50	62 contacts →
	Strong evidence “We design and manufacture a full line of components for our membrane filtration & wastewater systems.Together with our fabrication and installation partners around the world we…” Source: RevenueBase Database · checked Sep 30, 2026
11	Marlo Incorporated	Partial evidence	Racine, WI, United StatesHQ checked Sep 30, 2026	51-200	62 contacts →
	Partial 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 30, 2026
12	Wigen Water Technologies	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 30, 2026	51-200	62 contacts →
	Indirect 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 30, 2026
13	Puragain Water	Indirect evidence	Escondido, CA, United StatesHQ checked Sep 30, 2026	11-50	62 contacts →
	Indirect evidence “Puragain Water is a family owned business that takes pride in offering the very best in water filtration systems.” Source: RevenueBase Database · checked Sep 30, 2026
14	QUA	Strong evidence	Canonsburg, PA, United StatesHQ checked Sep 30, 2026	51-200	61 contacts →
	Strong evidence “QUA®, with our headquarters in the USA, develops, manufactures and markets advanced membrane products for water, waste water and water reuse applications to leading OEM's…” Source: RevenueBase Database · checked Sep 30, 2026
15	Emco Group	Indirect evidence	Canton, MA, United StatesHQ checked Sep 30, 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 30, 2026
16	Ameriwater	Indirect evidence	Dayton, OH, United StatesHQ checked Sep 30, 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 30, 2026
17	Aquasana	Indirect evidence	Austin, TX, United StatesHQ checked Sep 30, 2026	51-200	59 contacts →
	Indirect evidence “At Aquasana we believe clean water and a healthy environment are the most important components to healthy living and overall well-being.” Source: RevenueBase Database · checked Sep 30, 2026
18	Charger Water Treatment Products	Indirect evidence	Morton Grove, IL, United StatesHQ checked Sep 30, 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 30, 2026
19	Multipure International	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 30, 2026	51-200	51 contacts →
	Indirect evidence “Water is everywhere - in the air, in the ground, in the rivers and lakes.” Source: RevenueBase Database · checked Sep 30, 2026
20	Puronics	Partial evidence	Livermore, CA, United StatesHQ checked Sep 30, 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 30, 2026
21	Applied Membranes INC	Indirect evidence	Vista, CA, United StatesHQ checked Sep 30, 2026	201-500	46 contacts →
	Indirect evidence “Global water technology solutions provider since 1983.” Source: RevenueBase Database · checked Sep 30, 2026
22	Watersurplus	Indirect evidence	Loves Park, IL, United StatesHQ checked Sep 30, 2026	51-200	45 contacts →
	Indirect evidence “WaterSurplus is a leader in sustainable water treatment, delivering high-performance solutions across industries.” Source: RevenueBase Database · checked Sep 30, 2026
23	Gordon Water Systems	Indirect evidence	Kalamazoo, MI, United StatesHQ checked Sep 30, 2026	11-50	44 contacts →
	Indirect evidence “Gordon Water Systems is frequently recognized as the top water treatment company in West Michigan.” Source: RevenueBase Database · checked Sep 30, 2026
24	Nephros	Indirect evidence	South Orange, NJ, United StatesHQ checked Sep 30, 2026	11-50	40 contacts →
	Indirect evidence “Nephros is committed to improving the human relationship with water through leading, accessible technology.” Source: RevenueBase Database · checked Sep 30, 2026
25	Clean Water Guys	Indirect evidence	Omaha, NE, United StatesHQ checked Sep 30, 2026	11-50	40 contacts →
	Indirect evidence “402-330-6440 Industrial Road,#106, Omaha, NE 68137 Since 1979, United Distributors, Inc.” Source: RevenueBase Database · checked Sep 30, 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 membrane manufacturers. 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 membrane manufacturers.
Partial evidence: Its own public description names part of reverse osmosis membrane manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name reverse osmosis membrane manufacturers. 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 522 reverse osmosis membrane manufacturers based in the United States

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Reverse osmosis membrane manufacturers based in the United States at a glance

As of Sep 30, 2026

25.0%Verified-email coverage

12.2Average contacts per company

11-50Median size (employees)

1.7%Largest-city concentration · Houston

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

233

11-50

199

51-200

201-500

501-1,000

1,001-5,000

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 522 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 membrane manufacturers, 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 membrane manufacturers”. 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 membrane manufacturers), 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 membrane manufacturers, 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, 1,598 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 30, 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 membrane manufacturers, 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 membrane manufacturers are there based in the United States?

RevenueBase identified 522 reverse osmosis membrane manufacturers 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?

Aquatech, headquartered in Canonsburg, tops this list with the largest team on record.

Which city has the most reverse osmosis membrane manufacturers?

Houston leads with 9 headquartered companies, followed by San Diego (9) 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 1,598 verified decision-maker contacts tracked across these 522 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 30, 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.