Company lists · Data refreshed October 2026

Top 25 Commercial water treatment contractors based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Oct 10, 2026 331 companies tracked

RevenueBase identified 331 company matches for commercial water treatment contractors associated with the United Kingdom as of October 2026 and tracks 4,901 professional contacts across them, including 1,869 with verified work emails. London is the largest hub.

This list covers company matches for commercial water treatment contractors associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 10, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Oct 10, 2026 How this list was built

331Companies

4,901Contacts tracked

1,869Verified emails

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

Ranked by team size

Top 25 of 331 company matches for commercial water treatment contractors based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 10, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Selwood LTD	Exact match	Eastleigh, United KingdomHQ recorded Oct 10, 2026	501-1,000	506 contacts →
	Exact match “Selwood is your trusted partner in mission-critical water handling, storage, and treatment solutions across the UK.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
2	RSE	Exact match	Inverness Highlands, United KingdomHQ recorded Oct 10, 2026	501-1,000	291 contacts →
	Exact match “RSE is a trusted clean water technology company, developing market leading products and solutions for purifying drinking water, recycling wastewater and cleaning water in…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
3	Culligan UK	Exact match	Dereham, United KingdomHQ recorded Oct 10, 2026	501-1,000	243 contacts →
	Exact match “Culligan UK delivers innovative, high-quality water solutions to homes and businesses across the United Kingdom.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
4	Biwater	Exact match	Surrey, United KingdomHQ recorded Oct 10, 2026	501-1,000	186 contacts →
	Exact match “Biwater is a world leader in treated water, providing large-scale water and wastewater solutions for clients across the world.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
5	Severn Trent Services	Exact match	Coventry, United KingdomHQ recorded Oct 10, 2026	1,001-5,000	147 contacts →
	Exact match “Severn Trent Services offer a range of services to municipal and industrial clients, including the Ministry of Defence and the Coal Authority, for design, build and operation of…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
6	Salt Separation Services Limited	Exact match	Rochdale, United KingdomHQ recorded Oct 10, 2026	51-200	84 contacts →
	Exact match “Salt Separation Services Limited is an independent water treatment company specialising in the design, manufacture, installation and commissioning of water treatment systems.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
7	Feedwater Limited	Exact match	Moreton, United KingdomHQ recorded Oct 10, 2026	51-200	84 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
8	Envirogen Group	Exact match	Alfreton, United KingdomHQ recorded Oct 10, 2026	201-500	84 contacts →
	Exact match “Envirogen Group is a global leader in industrial water treatment and process filtration solutions.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
9	Siltbuster LTD	Exact match	Monmouth, United KingdomHQ recorded Oct 10, 2026	51-200	83 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
10	Sayvol Environmental And Building Services Limited	Exact match	Kettering, United KingdomHQ recorded Oct 10, 2026	51-200	61 contacts →
	Exact match “Independent Water Treatment & Water/Air Hygiene company with National coverage.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
11	Ashford Environmental Services Limited	Exact match	Ashford, United KingdomHQ recorded Oct 10, 2026	51-200	59 contacts →
	Exact match “Welcome to Ashford Environmental Services Limited, the UK's leading building services commissioning and water treatment specialist, providing a fully integrated service to…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
12	Fileder Filter Systems	Exact match	Maidstone, United KingdomHQ recorded Oct 10, 2026	51-200	58 contacts →
	Exact match “In short, we’re 'easy to deal with'.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
13	Advanced Water Technologies	Exact match	Warrington, United KingdomHQ recorded Oct 10, 2026	51-200	58 contacts →
	Exact match “Welcome to Advanced Water Technologies: A dedicated water treatment & hygiene specialists focused on providing optimum solutions across a vast array of services, chemicals…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
14	Hydrotec Water Treatment Specialists	Exact match	High Wycombe, United KingdomHQ recorded Oct 10, 2026	51-200	54 contacts →
	Exact match “Hydrotec is the UK’s leading company in the design and manufacture of water treatment products for the building services industry.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
15	PH Water Part Of Complii	Exact match	Farnborough, United KingdomHQ recorded Oct 10, 2026	51-200	46 contacts →
	Exact match “ph Water technologies are one of the leading ‘Total Environment Solutions Companies' operating within the UK.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
16	Guardian Water Treatment Marlowe Environmental Services	Exact match	Basildon, United KingdomHQ recorded Oct 10, 2026	51-200	43 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
17	Water Treatment Products LTD	Exact match	Blaenavon, United KingdomHQ recorded Oct 10, 2026	51-200	43 contacts →
	Exact match “Water Treatment Products Ltd, established in formulate and manufacture speciality chemicals for a wide range of water treatment companies and applications.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
18	Billi UK	Exact match	Wolverhampton, United KingdomHQ recorded Oct 10, 2026	51-200	41 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
19	Pennon Water Services	Exact match	Bournemouth, United KingdomHQ recorded Oct 10, 2026	51-200	41 contacts →
	Exact match “Pennon Water Services (PWS) provides B2B water and wastewater retail services to business accounts across England and Scotland.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
20	Arvia Technology	Exact match	Runcorn, United KingdomHQ recorded Oct 10, 2026	11-50	37 contacts →
	Exact match “Tertiary water treatment specialist.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
21	GES Water	Exact match	Aylesbury, United KingdomHQ recorded Oct 10, 2026	11-50	35 contacts →
	Exact match “Since 1990 we have provided our clients with leading edge solutions to legionella management.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
22	Panton Mcleod	Exact match	Selkirk, United KingdomHQ recorded Oct 10, 2026	11-50	33 contacts →
	Exact match “Our teams are dedicated to supporting our clients to protect, maintain and improve water quality within treatment and distribution systems.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
23	Reigate Environmental Services Limited	Exact match	Redhill, United KingdomHQ recorded Oct 10, 2026	11-50	32 contacts →
	Exact match “Reigate Environmental Services Limited is a Water Treatment and Maintenance company based at 42 Ormside Way, Holmethorpe Industrial Estate, Redhill, Surrey, United Kingdom.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
24	Lubron UK	Exact match	Colchester, United KingdomHQ recorded Oct 10, 2026	51-200	30 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase
25	Retroflo	Exact match	Seaham, United KingdomHQ recorded Oct 10, 2026	11-50	30 contacts →
	Exact match “Based in the North East of England, Retroflo Ltd are an Electrical and Mechanical contractor whose main activities are focused in the water industry.” Recorded in the RevenueBase company graph · Oct 10, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “commercial water treatment contractors”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 331 commercial water treatment contractors based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 1,869 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Oct 10, 2026

38.1%Verified-email coverage

14.8Average contacts per company

1-10Median size (employees)

4.2%Largest-city concentration · London

Oct 10, 2026Page data refreshed

Companies by employee count

1-10

168

11-50

108

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 331 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “commercial water treatment contractors” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 1,869 professional contacts with verified work emails across the full matched dataset. 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 October 10, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “commercial water treatment contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many commercial water treatment contractors are there based in the United Kingdom?

RevenueBase identified 331 company matches for commercial water treatment contractors associated with the United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Selwood LTD tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most commercial water treatment contractors?

London leads with 14 company records, followed by Bristol (5) and Manchester (5).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,869 professional contacts with verified work emails tracked across these 331 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 10, 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 SmartSearch, 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.