Company lists · Data refreshed September 2026

Top 25 Reverse osmosis water purification system manufacturers based in the United States

Name: Reverse osmosis water purification system 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 1,118 companies tracked

RevenueBase identified 1,118 reverse osmosis water purification system manufacturers headquartered in the United States as of September 2026 and tracks 10,487 professional contacts across them, including 3,089 with verified work emails. Houston is the largest hub.

This list covers reverse osmosis water purification system 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

1,118Companies

10,487Contacts tracked

3,089Verified emails

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The 25 largest reverse osmosis water purification system manufacturers based in the United States

Ranked by team size

Top 25 of 1,118 reverse osmosis water purification system 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 water purification system 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	Westech Engineering	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 30, 2026	501-1,000	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 30, 2026
2	Packard Culligan Water	Partial evidence	Minnetonka, MN, United StatesHQ checked Sep 30, 2026	501-1,000	272 contacts →
	Partial evidence “Packard Culligan Water is a family-owned company with values based on relationships, unity, listening, and leading locally.” Source: RevenueBase Database · checked Sep 30, 2026
3	Culligan By Waterco	Strong evidence	Lombard, IL, United StatesHQ checked Sep 30, 2026	501-1,000	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 30, 2026
4	Aqua-Chem	Partial evidence	Knoxville, TN, United StatesHQ checked Sep 30, 2026	201-500	152 contacts →
	Partial evidence “Aqua-Chem is the leader in providing Global Water Solutions.” Source: RevenueBase Database · checked Sep 30, 2026
5	Oasis International	Strong evidence	Columbus, OH, United StatesHQ checked Sep 30, 2026	201-500	102 contacts →
	Strong evidence “OASIS International is a global leader in the design, manufacture and distribution of clean drinking water systems.” Source: RevenueBase Database · checked Sep 30, 2026
6	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
7	Puretec Industrial Water	Partial evidence	Oxnard, CA, United StatesHQ checked Sep 30, 2026	51-200	91 contacts →
	Partial 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
8	HYDRO	Strong evidence	Durham, NC, United StatesHQ checked Sep 30, 2026	51-200	86 contacts →
	Strong evidence “We Design, Build, Install, Start Up, and Validate High-Purity Water Systems-Improving Lives Through Water Purification.” Source: RevenueBase Database · checked Sep 30, 2026
9	Samco Technologies	Partial evidence	Buffalo, NY, United StatesHQ checked Sep 30, 2026	51-200	82 contacts →
	Partial 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
10	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
11	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
12	Lakos Filtration Solutions	Partial evidence	Fresno, CA, United StatesHQ checked Sep 30, 2026	51-200	73 contacts →
	Partial evidence “In 1972, LAKOS was founded on the belief that filtering water should be simple – both for the people who operate filtration equipment and the environment.” Source: RevenueBase Database · checked Sep 30, 2026
13	Paragon Water Systems INC	Strong evidence	Tampa, FL, United StatesHQ checked Sep 30, 2026	201-500	73 contacts →
	Strong 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
14	Marlo Incorporated	Strong evidence	Racine, WI, United StatesHQ checked Sep 30, 2026	51-200	62 contacts →
	Strong 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
15	Wigen Water Technologies	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 30, 2026	51-200	62 contacts →
	Strong 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
16	Puragain Water	Strong evidence	Escondido, CA, United StatesHQ checked Sep 30, 2026	11-50	62 contacts →
	Strong 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
17	Emco Group	Partial evidence	Canton, MA, United StatesHQ checked Sep 30, 2026	51-200	60 contacts →
	Partial 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
18	Ameriwater	Partial evidence	Dayton, OH, United StatesHQ checked Sep 30, 2026	51-200	59 contacts →
	Partial 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
19	Watertectonics	Strong evidence	Everett, WA, United StatesHQ checked Sep 30, 2026	11-50	59 contacts →
	Strong 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 30, 2026
20	Aquasana	Partial evidence	Austin, TX, United StatesHQ checked Sep 30, 2026	51-200	59 contacts →
	Partial 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
21	Sigura	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 30, 2026	1,001-5,000	56 contacts →
	Partial evidence “Sigura, a leading provider of innovative water treatment solutions, has completed a merger with Solenis.” Source: RevenueBase Database · checked Sep 30, 2026
22	Kemco Systems	Strong evidence	Clearwater, FL, United StatesHQ checked Sep 30, 2026	51-200	55 contacts →
	Strong 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 30, 2026
23	Clear Creek Systems	Strong evidence	Bakersfield, CA, United StatesHQ checked Sep 30, 2026	51-200	54 contacts →
	Strong evidence “Clear Creek Systems is a leading provider of water treatment systems and services.” Source: RevenueBase Database · checked Sep 30, 2026
24	The U.S. Water Culligan Group	Indirect evidence	Wheeling, IL, United StatesHQ checked Sep 30, 2026	201-500	53 contacts →
	Indirect evidence “The U.S.” Source: RevenueBase Database · checked Sep 30, 2026
25	Charger Water Treatment Products	Partial evidence	Morton Grove, IL, United StatesHQ checked Sep 30, 2026	51-200	51 contacts →
	Partial evidence “No matter what your water problem, Charger Water Treatment Products has a solution.” 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 water purification system 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 water purification system manufacturers.
Partial evidence: Its own public description names part of reverse osmosis water purification system 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 water purification system 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 1,118 reverse osmosis water purification system manufacturers based in the United States

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Reverse osmosis water purification system manufacturers based in the United States at a glance

As of Sep 30, 2026

29.5%Verified-email coverage

9.4Average contacts per company

1-10Median size (employees)

1.7%Largest-city concentration · Houston

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

566

11-50

392

51-200

107

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 1,118 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 water purification system 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 water purification system 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 water purification system 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 water purification system 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, 3,089 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 water purification system 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 water purification system manufacturers are there based in the United States?

RevenueBase identified 1,118 reverse osmosis water purification system 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?

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

Which city has the most reverse osmosis water purification system manufacturers?

Houston leads with 19 headquartered companies, followed by San Diego (12) and Las Vegas (10).

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 3,089 verified decision-maker contacts tracked across these 1,118 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.