Company lists · Data refreshed September 2026

Top 25 Industrial water treatment services based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 573 companies tracked

RevenueBase identified 573 industrial water treatment services headquartered in the United Kingdom as of September 2026 and tracks 15,898 professional contacts across them, including 6,053 with verified work emails. London is the largest hub.

This list covers industrial water treatment services 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 17, 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 17, 2026 86% judged on-target in blind review

573Companies

15,898Contacts tracked

6,053Verified emails

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The 25 largest industrial water treatment services based in the United Kingdom

Ranked by team size

Top 25 of 573 industrial water treatment services based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to industrial water treatment services: 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	Pentair	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	5,001-10,000	6,636 contacts →
	Partial evidence “At Pentair, we help the world sustainably move, improve, and enjoy water, life’s most essential resource.” Source: RevenueBase Database · checked Sep 17, 2026
2	MWH Treatment	Strong evidence	Stockport, United KingdomHQ checked Sep 17, 2026	1,001-5,000	879 contacts →
	Strong evidence “MWH Treatment is a leading Design and Build non-infrastructure solution provider in the UK water sector, with a water sector heritage dating back to 1820.” Source: RevenueBase Database · checked Sep 17, 2026
3	RSE	Partial evidence	Inverness Highlands, United KingdomHQ checked Sep 17, 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 17, 2026
4	Selwood LTD	Strong evidence	Eastleigh, United KingdomHQ checked Sep 17, 2026	501-1,000	477 contacts →
	Strong evidence “Selwood is your trusted partner in mission-critical water handling, storage, and treatment solutions across the UK.” Source: RevenueBase Database · checked Sep 17, 2026
5	NCH Europe	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 17, 2026	10001+	453 contacts →
	Partial evidence “Industrial solutions since 1919 At NCH, we don’t just sell products-we deliver solutions that keep businesses moving.” Source: RevenueBase Database · checked Sep 17, 2026
6	Xylem Water Solutions UK & Ireland	Partial evidence	Nottingham, United KingdomHQ checked Sep 17, 2026	501-1,000	319 contacts →
	Partial evidence “Xylem is a leading global water solutions company dedicated to advancing sustainable impact and empowering the people who make water work every day.” Source: RevenueBase Database · checked Sep 17, 2026
7	Culligan UK	Partial evidence	Dereham, United KingdomHQ checked Sep 17, 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 17, 2026
8	Biwater	Partial evidence	Surrey, United KingdomHQ checked Sep 17, 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 17, 2026
9	Industrial Chemicals LTD	Partial evidence	Grays, United KingdomHQ checked Sep 17, 2026	201-500	167 contacts →
	Partial evidence “Industrial Chemicals Limited (ICL) is a trusted supplier to a diverse range of industries across the UK, Europe, and parts of Asia.” Source: RevenueBase Database · checked Sep 17, 2026
10	Severn Trent Services	Partial evidence	Coventry, United KingdomHQ checked Sep 17, 2026	1,001-5,000	137 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
11	Enpure	Strong evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	51-200	113 contacts →
	Strong evidence “Enpure is a process engineering company specializing in water, wastewater and sludge treatment as well as waste-to-energy solutions with a global presence.” Source: RevenueBase Database · checked Sep 17, 2026
12	IWS Water Hygiene	Strong evidence	Walsall, United KingdomHQ checked Sep 17, 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 17, 2026
13	Salt Separation Services Limited	Strong evidence	Rochdale, United KingdomHQ checked Sep 17, 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 17, 2026
14	Feedwater Limited	Strong evidence	Moreton, United KingdomHQ checked Sep 17, 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 17, 2026
15	Nijhuis Saur Industries UK And Ireland	Strong evidence	United Kingdom & Ireland, United KingdomHQ checked Sep 17, 2026	201-500	76 contacts →
	Strong 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 17, 2026
16	Envirogen Group	Strong evidence	Alfreton, United KingdomHQ checked Sep 17, 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 17, 2026
17	Siltbuster LTD	Strong evidence	Monmouth, United KingdomHQ checked Sep 17, 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 17, 2026
18	Richard Alan	Indirect evidence	Dewsbury, United KingdomHQ checked Sep 17, 2026	51-200	74 contacts →
	Indirect evidence “Established in 1970, the West Yorkshire-based Richard Alan Group is a portfolio of businesses providing high-quality Engineering Design, Manufacture, Installation and Servicing to…” Source: RevenueBase Database · checked Sep 17, 2026
19	Jacopa Limited	Indirect evidence	West Bromwich, United KingdomHQ checked Sep 17, 2026	51-200	73 contacts →
	Indirect evidence “Many of the best known, most respected and reliable brand names in the wastewater industry are part of Jacopa's heritage.” Source: RevenueBase Database · checked Sep 17, 2026
20	Glanville Environmental	Indirect evidence	Ivybridge, United KingdomHQ checked Sep 17, 2026	201-500	64 contacts →
	Indirect evidence “Glanville Environmental help commercial infrastructure owners reduce pollution and flood risk by inspecting and maintaining ageing drainage systems and installing new…” Source: RevenueBase Database · checked Sep 17, 2026
21	Ashford Environmental Services Limited	Strong evidence	Ashford, United KingdomHQ checked Sep 17, 2026	51-200	61 contacts →
	Strong evidence “Welcome to Ashford Environmental Services Limited, the UK's leading building services commissioning and water treatment specialist, providing a fully integrated service to…” Source: RevenueBase Database · checked Sep 17, 2026
22	Deritend	Indirect evidence	Wolverhampton, United KingdomHQ checked Sep 17, 2026	51-200	58 contacts →
	Indirect evidence “We are one of the UK’s fastest growing in and most dynamic maintenance services organisations, encompassing several specialist engineering operations within the group.” Source: RevenueBase Database · checked Sep 17, 2026
23	Sayvol Environmental And Building Services Limited	Strong evidence	Kettering, United KingdomHQ checked Sep 17, 2026	51-200	57 contacts →
	Strong evidence “Independent Water Treatment & Water/Air Hygiene company with National coverage.” Source: RevenueBase Database · checked Sep 17, 2026
24	Fileder Filter Systems	Indirect evidence	Maidstone, United KingdomHQ checked Sep 17, 2026	51-200	53 contacts →
	Indirect evidence “In short, we’re 'easy to deal with'.” Source: RevenueBase Database · checked Sep 17, 2026
25	Advanced Water Technologies	Strong evidence	Warrington, United KingdomHQ checked Sep 17, 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 17, 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: industrial water treatment services. 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 industrial water treatment services.
Partial evidence: Its own public description names part of industrial water treatment services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial water treatment services. 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 573 industrial water treatment services based in the United Kingdom

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Industrial water treatment services based in the United Kingdom at a glance

As of Sep 17, 2026

38.1%Verified-email coverage

27.7Average contacts per company

11-50Median size (employees)

4.5%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

262

11-50

204

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 573 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 industrial water treatment services, 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 “industrial water treatment services”. 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 industrial water treatment services), 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 industrial water treatment services, 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, 6,053 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 17, 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.

Industrial water treatment services by metro

Industrial water treatment services in London26

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 industrial water treatment services, 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 industrial water treatment services are there based in the United Kingdom?

RevenueBase identified 573 industrial water treatment services 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?

Pentair, headquartered in London, tops this list with the largest team on record.

Which city has the most industrial water treatment services?

London leads with 26 headquartered companies, followed by Birmingham (9) and Colchester (7).

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 6,053 verified decision-maker contacts tracked across these 573 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 17, 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.