Company lists · Data refreshed September 2026

Top 25 Water filtration services companies based in the United Kingdom

Name: Water filtration services 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 22, 2026 249 companies tracked

RevenueBase identified 249 water filtration services companies headquartered in the United Kingdom as of September 2026 and tracks 2,601 professional contacts across them, including 1,162 with verified work emails. London is the largest hub.

This list covers water filtration services 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 22, 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 22, 2026 86% judged on-target in blind review

249Companies

2,601Contacts tracked

1,162Verified emails

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The 25 largest water filtration services companies based in the United Kingdom

Ranked by team size

Top 25 of 249 water filtration services companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to water filtration services 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 22, 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 22, 2026
2	Culligan UK	Partial evidence	Dereham, United KingdomHQ checked Sep 22, 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 22, 2026
3	Salt Separation Services Limited	Partial evidence	Rochdale, United KingdomHQ checked Sep 22, 2026	51-200	80 contacts →
	Partial 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 22, 2026
4	Envirogen Group	Strong evidence	Alfreton, United KingdomHQ checked Sep 22, 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 22, 2026
5	Siltbuster LTD	Partial evidence	Monmouth, United KingdomHQ checked Sep 22, 2026	51-200	75 contacts →
	Partial 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 22, 2026
6	Fileder Filter Systems	Indirect evidence	Maidstone, United KingdomHQ checked Sep 22, 2026	51-200	53 contacts →
	Indirect evidence “In short, we’re 'easy to deal with'.” Source: RevenueBase Database · checked Sep 22, 2026
7	Guardian Water Treatment Marlowe Environmental Services	Partial evidence	Basildon, United KingdomHQ checked Sep 22, 2026	51-200	50 contacts →
	Partial 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 22, 2026
8	Billi UK	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 22, 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 22, 2026
9	Sterling Hydrotech Marlowe Environmental Services	Strong evidence	Chesterfield, United KingdomHQ checked Sep 22, 2026	51-200	36 contacts →
	Strong evidence “Swimming Pool Filtration and Water Treatment Specialist Sterling Hydrotech are part of WCS Environmental Engineering, registered in England and Wales (02275897) at 20 Grosvenor…” Source: RevenueBase Database · checked Sep 22, 2026
10	Watertight Management	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 22, 2026	51-200	31 contacts →
	Partial evidence “Watertight Management has established itself as a leader in the provision of Clean and Waste water management services.” Source: RevenueBase Database · checked Sep 22, 2026
11	Pennon Water Services	Partial evidence	Bournemouth, United KingdomHQ checked Sep 22, 2026	51-200	31 contacts →
	Partial evidence “Pennon Water Services (PWS) provides B2B water and wastewater retail services to business accounts across England and Scotland.” Source: RevenueBase Database · checked Sep 22, 2026
12	Epsco LTD	Partial evidence	Perth, United KingdomHQ checked Sep 22, 2026	11-50	29 contacts →
	Partial evidence “EPSCO delivers the highest standards in water system cleanliness and performance, specialising in Offshore and Marine potable water, Industrial Cooling and Water Utilities.” Source: RevenueBase Database · checked Sep 22, 2026
13	Dryden Aqua	Partial evidence	Edinburgh, United KingdomHQ checked Sep 22, 2026	11-50	28 contacts →
	Partial evidence “We are a leading aquatic environmental water treatment company specializing in technology and product innovation.” Source: RevenueBase Database · checked Sep 22, 2026
14	Lubron UK	Partial evidence	Colchester, United KingdomHQ checked Sep 22, 2026	51-200	26 contacts →
	Partial evidence “Lubron Water Technology UK is part of the European Market leading water treatment provider, Lubron Group, which has subsidiaries in the Netherlands, Germany and Belgium.” Source: RevenueBase Database · checked Sep 22, 2026
15	Chem-Aqua Europe	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 22, 2026	n/a	25 contacts →
	Partial evidence “Water treatment is an important part of preventative maintenance programmes for boiler, cooling and process water systems.” Source: RevenueBase Database · checked Sep 22, 2026
16	Allied Filter Systems LTD	Indirect evidence	Irlam, United KingdomHQ checked Sep 22, 2026	51-200	23 contacts →
	Indirect evidence “Allied Filter Systems Ltd® is the UK’s leading manufacturer & supplier of high-performance liquid filter bags, filter cartridges and filter equipment for process industries.” Source: RevenueBase Database · checked Sep 22, 2026
17	Acwa Services Limited	Partial evidence	Skipton, United KingdomHQ checked Sep 22, 2026	11-50	22 contacts →
	Partial evidence “ACWA Services Limited is a Municipal and Industrial Water and Wastewater Treatment company located in Skipton, United Kingdom.” Source: RevenueBase Database · checked Sep 22, 2026
18	Excel Water LTD	Partial evidence	Castleford, United KingdomHQ checked Sep 22, 2026	11-50	21 contacts →
	Partial evidence “At Excel Water, we pride ourselves on our unwavering commitment to delivering exceptional water treatment and purification solutions tailored to the diverse needs of our clients.” Source: RevenueBase Database · checked Sep 22, 2026
19	Monarch Water	Partial evidence	Diss, United KingdomHQ checked Sep 22, 2026	11-50	20 contacts →
	Partial evidence “Monarch is a leading UK manufacturer and distributor of high quality, high performance water softeners, water conditioners, scale inhibitors, water filters and purifiers, taps and…” Source: RevenueBase Database · checked Sep 22, 2026
20	Westbury Group	Indirect evidence	Sandringham Court, United KingdomHQ checked Sep 22, 2026	51-200	16 contacts →
	Indirect evidence “Established in 1969, Westbury has become the largest privately owned British air filter manufacturer, with it’s Head Office and Factory based in Burnley Lancashire and additional…” Source: RevenueBase Database · checked Sep 22, 2026
21	Ecopure Waters	Partial evidence	Buckinghamshire, United KingdomHQ checked Sep 22, 2026	11-50	15 contacts →
	Partial evidence “Your water.” Source: RevenueBase Database · checked Sep 22, 2026
22	Trident Water Solutions Limited	Partial evidence	Royal Wootton Bassett, United KingdomHQ checked Sep 22, 2026	11-50	15 contacts →
	Partial evidence “Trident Water Solutions are a privately owned, independent company that prides itself on sector-leading levels, with a high quality service at a great value to the water…” Source: RevenueBase Database · checked Sep 22, 2026
23	Synthesis	Partial evidence	Alderley Edge, United KingdomHQ checked Sep 22, 2026	51-200	15 contacts →
	Partial evidence “We specialise in water treatment and disinfection, operating in almost every industry where water treatment is required.” Source: RevenueBase Database · checked Sep 22, 2026
24	Aquazero Limited	Partial evidence	Skegness, United KingdomHQ checked Sep 22, 2026	1-10	15 contacts →
	Partial evidence “Aquazero Ltd is a producer of high quality demineralised process water; ultra-pure WFI-quality water; and alcohol blends used in hospitals and surgeries for cleaning hard surfaces.” Source: RevenueBase Database · checked Sep 22, 2026
25	Hygiene Contracts	Partial evidence	Burnt Mills Industrial Estate, United KingdomHQ checked Sep 22, 2026	51-200	14 contacts →
	Partial evidence “We are an independent company that undertakes all forms of air and water hygiene services.” Source: RevenueBase Database · checked Sep 22, 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: water filtration services 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 water filtration services companies.
Partial evidence: Its own public description names part of water filtration services companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water filtration services 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 249 water filtration services companies based in the United Kingdom

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Water filtration services companies based in the United Kingdom at a glance

As of Sep 22, 2026

44.7%Verified-email coverage

10.4Average contacts per company

1-10Median size (employees)

6.4%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

139

11-50

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 249 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 water filtration services 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 “water filtration services 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 water filtration services 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 water filtration services 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, 1,162 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 22, 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 water filtration services 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 water filtration services companies are there based in the United Kingdom?

RevenueBase identified 249 water filtration services 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 water filtration services companies?

London leads with 16 headquartered companies, followed by Wolverhampton (5) and Belfast (3).

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 1,162 verified decision-maker contacts tracked across these 249 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 22, 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.