Company lists · Data refreshed September 2026

Top 25 Commercial water treatment companies based in the United Kingdom

Name: Commercial water treatment companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 375 companies tracked

RevenueBase identified 375 commercial water treatment companies headquartered in the United Kingdom as of September 2026 and tracks 5,138 professional contacts across them, including 1,940 with verified work emails. London is the largest hub.

This list covers commercial water treatment companies headquartered in the United Kingdom, 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 19, 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 19, 2026 86% judged on-target in blind review

375Companies

5,138Contacts tracked

1,940Verified emails

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The 25 largest commercial water treatment companies based in the United Kingdom

Ranked by team size

Top 25 of 375 commercial water treatment companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to commercial water treatment 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	RSE	Partial evidence	Inverness Highlands, United KingdomHQ checked Sep 19, 2026	501-1,000	498 contacts →
	Partial evidence “RSE is a trusted clean water technology company, developing market leading products and solutions for purifying drinking water, recycling wastewater and cleaning water in…” Source: RevenueBase Database · checked Sep 19, 2026
2	Culligan UK	Partial evidence	Dereham, United KingdomHQ checked Sep 19, 2026	501-1,000	231 contacts →
	Partial evidence “Culligan UK delivers innovative, high-quality water solutions to homes and businesses across the United Kingdom.” Source: RevenueBase Database · checked Sep 19, 2026
3	Biwater	Partial evidence	Surrey, United KingdomHQ checked Sep 19, 2026	501-1,000	178 contacts →
	Partial evidence “Biwater is a world leader in treated water, providing large-scale water and wastewater solutions for clients across the world.” Source: RevenueBase Database · checked Sep 19, 2026
4	IWS Water Hygiene	Strong evidence	Walsall, United KingdomHQ checked Sep 19, 2026	201-500	113 contacts →
	Strong evidence “We provide a comprehensive range of specialist water treatment & water hygiene services including legionella control, risk assessment, asset monitoring, water system remedial…” Source: RevenueBase Database · checked Sep 19, 2026
5	HBE	Indirect evidence	Newry, United KingdomHQ checked Sep 19, 2026	51-200	87 contacts →
	Indirect evidence “HBE is a well respected provider of compliance services on local basis, assisting building & facilities managers in providing a safe and healthy built environment for employees…” Source: RevenueBase Database · checked Sep 19, 2026
6	Salt Separation Services Limited	Strong evidence	Rochdale, United KingdomHQ checked Sep 19, 2026	51-200	80 contacts →
	Strong evidence “Salt Separation Services Limited is an independent water treatment company specialising in the design, manufacture, installation and commissioning of water treatment systems.” Source: RevenueBase Database · checked Sep 19, 2026
7	Feedwater Limited	Strong evidence	Moreton, United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Strong evidence “Feedwater Ltd is a UK Water Treatment Company, established in 1976 specifically to supply products and services for the treatment of water for steam boilers, cooling towers…” Source: RevenueBase Database · checked Sep 19, 2026
8	Nijhuis Saur Industries UK And Ireland	Partial evidence	United Kingdom & Ireland, United KingdomHQ checked Sep 19, 2026	201-500	76 contacts →
	Partial evidence “At Nijhuis Saur Industries UK & Ireland our aim is to help our customers realise the value of their water and wastewater.” Source: RevenueBase Database · checked Sep 19, 2026
9	Envirogen Group	Strong evidence	Alfreton, United KingdomHQ checked Sep 19, 2026	201-500	75 contacts →
	Strong evidence “Envirogen Group is a global leader in industrial water treatment and process filtration solutions.” Source: RevenueBase Database · checked Sep 19, 2026
10	Siltbuster LTD	Strong evidence	Monmouth, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Strong evidence “At Siltbuster Ltd, we operate the UK’s largest rental fleet of water treatment systems, setting the industry benchmark for rapid, reliable, and cost-effective solutions.” Source: RevenueBase Database · checked Sep 19, 2026
11	WCS Group	Strong evidence	Gloucester, United KingdomHQ checked Sep 19, 2026	1,001-5,000	72 contacts →
	Strong evidence “WCS Group is the leading water treatment, water hygiene, air hygiene and Asbestos specialist with 1700+ staff nationally.” Source: RevenueBase Database · checked Sep 19, 2026
12	Sayvol Environmental And Building Services Limited	Strong evidence	Kettering, United KingdomHQ checked Sep 19, 2026	51-200	57 contacts →
	Strong evidence “Independent Water Treatment & Water/Air Hygiene company with National coverage.” Source: RevenueBase Database · checked Sep 19, 2026
13	Fileder Filter Systems	Indirect evidence	Maidstone, United KingdomHQ checked Sep 19, 2026	51-200	53 contacts →
	Indirect evidence “In short, we’re 'easy to deal with'.” Source: RevenueBase Database · checked Sep 19, 2026
14	Advanced Water Technologies	Strong evidence	Warrington, United KingdomHQ checked Sep 19, 2026	51-200	52 contacts →
	Strong evidence “Welcome to Advanced Water Technologies: A dedicated water treatment & hygiene specialists focused on providing optimum solutions across a vast array of services, chemicals…” Source: RevenueBase Database · checked Sep 19, 2026
15	Guardian Water Treatment Marlowe Environmental Services	Strong evidence	Basildon, United KingdomHQ checked Sep 19, 2026	51-200	50 contacts →
	Strong evidence “Guardian part of Marlowe Environmental Services, delivers a range of water treatment and air quality services, allowing the systems that rely on these elements to work effectively…” Source: RevenueBase Database · checked Sep 19, 2026
16	PH Water Part Of Complii	Partial evidence	Farnborough, United KingdomHQ checked Sep 19, 2026	51-200	50 contacts →
	Partial evidence “ph Water technologies are one of the leading ‘Total Environment Solutions Companies' operating within the UK.” Source: RevenueBase Database · checked Sep 19, 2026
17	Hydrotec Water Treatment Specialists	Strong evidence	High Wycombe, United KingdomHQ checked Sep 19, 2026	51-200	50 contacts →
	Strong evidence “Hydrotec is the UK’s leading company in the design and manufacture of water treatment products for the building services industry.” Source: RevenueBase Database · checked Sep 19, 2026
18	Billi UK	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 19, 2026	51-200	40 contacts →
	Partial evidence “At Billi, we design and manufacture a range of energy efficient filtered water systems that offer our customers the very best in innovation, superior performance and reliability.” Source: RevenueBase Database · checked Sep 19, 2026
19	Hydro Industries Limited	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	40 contacts →
	Partial evidence “Hydro Industries.generating clean water Clean Water is a limited natural resource essential for life and economic growth.” Source: RevenueBase Database · checked Sep 19, 2026
20	Water Treatment Products LTD	Strong evidence	Blaenavon, United KingdomHQ checked Sep 19, 2026	51-200	40 contacts →
	Strong evidence “Water Treatment Products Ltd, established in formulate and manufacture speciality chemicals for a wide range of water treatment companies and applications.” Source: RevenueBase Database · checked Sep 19, 2026
21	BWA Water Additives	Partial evidence	M32 0tb, United KingdomHQ checked Sep 19, 2026	51-200	38 contacts →
	Partial evidence “BWA is a technology-led specialty chemicals company who provides sustainable water management solutions to increase our customers’ competitive advantage.” Source: RevenueBase Database · checked Sep 19, 2026
22	Concept Environmental Solutions	Partial evidence	Tortworth, United KingdomHQ checked Sep 19, 2026	51-200	36 contacts →
	Partial evidence “Welcome to Concept Environmental Solutions, your trusted water and air hygiene experts.” Source: RevenueBase Database · checked Sep 19, 2026
23	Elentec	Strong evidence	Bethesda, United KingdomHQ checked Sep 19, 2026	11-50	36 contacts →
	Strong evidence “Elentec develops and supplies electrochemical water treatment systems - together with appropriate separation technology.” Source: RevenueBase Database · checked Sep 19, 2026
24	Panton Mcleod	Strong evidence	Selkirk, United KingdomHQ checked Sep 19, 2026	11-50	35 contacts →
	Strong evidence “Our teams are dedicated to supporting our clients to protect, maintain and improve water quality within treatment and distribution systems.” Source: RevenueBase Database · checked Sep 19, 2026
25	Arvia Technology	Strong evidence	Runcorn, United KingdomHQ checked Sep 19, 2026	11-50	32 contacts →
	Strong evidence “Tertiary water treatment specialist.” Source: RevenueBase Database · checked Sep 19, 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: commercial water treatment 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 commercial water treatment companies.
Partial evidence: Its own public description names part of commercial water treatment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name commercial water treatment 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 375 commercial water treatment companies based in the United Kingdom

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Commercial water treatment companies based in the United Kingdom at a glance

As of Sep 19, 2026

37.8%Verified-email coverage

13.7Average contacts per company

11-50Median size (employees)

3.5%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

177

11-50

131

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 375 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 commercial water treatment 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 Kingdom whose own description of what they do matches “commercial water treatment 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 commercial water treatment 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 commercial water treatment companies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 1,940 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 19, 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 commercial water treatment 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 commercial water treatment companies are there based in the United Kingdom?

RevenueBase identified 375 commercial water treatment companies headquartered in the United Kingdom 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?

RSE, headquartered in Inverness Highlands, tops this list with the largest team on record.

Which city has the most commercial water treatment companies?

London leads with 13 headquartered companies, followed by Birmingham (7) and Bristol (5).

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 1,940 verified decision-maker contacts tracked across these 375 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 19, 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.