Company lists · Data refreshed September 2026

Top 25 Residential water treatment companies based in the United Kingdom

Name: Residential 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 21, 2026 179 companies tracked

RevenueBase identified 179 residential water treatment companies headquartered in the United Kingdom as of September 2026 and tracks 2,186 professional contacts across them, including 957 with verified work emails. London is the largest hub.

This list covers residential 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 21, 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 21, 2026 86% judged on-target in blind review

179Companies

2,186Contacts tracked

957Verified emails

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

Ranked by team size

Top 25 of 179 residential water treatment companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to residential 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 21, 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 21, 2026
2	Culligan UK	Partial evidence	Dereham, United KingdomHQ checked Sep 21, 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 21, 2026
3	Envirogen Group	Strong evidence	Alfreton, United KingdomHQ checked Sep 21, 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 21, 2026
4	Siltbuster LTD	Strong evidence	Monmouth, United KingdomHQ checked Sep 21, 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 21, 2026
5	Fileder Filter Systems	Indirect evidence	Maidstone, United KingdomHQ checked Sep 21, 2026	51-200	53 contacts →
	Indirect evidence “In short, we’re 'easy to deal with'.” Source: RevenueBase Database · checked Sep 21, 2026
6	Guardian Water Treatment Marlowe Environmental Services	Strong evidence	Basildon, United KingdomHQ checked Sep 21, 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 21, 2026
7	Billi UK	Partial evidence	Wolverhampton, United KingdomHQ checked Sep 21, 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 21, 2026
8	Water Treatment Products LTD	Strong evidence	Blaenavon, United KingdomHQ checked Sep 21, 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 21, 2026
9	Lubron UK	Strong evidence	Colchester, United KingdomHQ checked Sep 21, 2026	51-200	26 contacts →
	Strong 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 21, 2026
10	Chem-Aqua Europe	Strong evidence	Wolverhampton, United KingdomHQ checked Sep 21, 2026	n/a	25 contacts →
	Strong evidence “Water treatment is an important part of preventative maintenance programmes for boiler, cooling and process water systems.” Source: RevenueBase Database · checked Sep 21, 2026
11	TWC Total Water Care	Strong evidence	Bicester, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Strong evidence “Our core team have numerous years experience in the field of commercial water treatment and a proven track record of delivering effective, compliant water treatments packages.” Source: RevenueBase Database · checked Sep 21, 2026
12	Acwa Services Limited	Strong evidence	Skipton, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Strong evidence “ACWA Services Limited is a Municipal and Industrial Water and Wastewater Treatment company located in Skipton, United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
13	Excel Water LTD	Strong evidence	Castleford, United KingdomHQ checked Sep 21, 2026	11-50	21 contacts →
	Strong 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 21, 2026
14	Monarch Water	Partial evidence	Diss, United KingdomHQ checked Sep 21, 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 21, 2026
15	Pureh2o LTD	Indirect evidence	Woking, United KingdomHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “At PureH2O we put environmental sustainability at the heart of everything we do.” Source: RevenueBase Database · checked Sep 21, 2026
16	Ecopure Waters	Partial evidence	Buckinghamshire, United KingdomHQ checked Sep 21, 2026	11-50	15 contacts →
	Partial evidence “Your water.” Source: RevenueBase Database · checked Sep 21, 2026
17	Synthesis	Strong evidence	Alderley Edge, United KingdomHQ checked Sep 21, 2026	51-200	15 contacts →
	Strong evidence “We specialise in water treatment and disinfection, operating in almost every industry where water treatment is required.” Source: RevenueBase Database · checked Sep 21, 2026
18	Adept Pure Water LTD	Strong evidence	Wellingborough, United KingdomHQ checked Sep 21, 2026	11-50	11 contacts →
	Strong evidence “ADEPT Pure Water Limited are specialists in the design, manufacture, commission, installation and Service of Water Purification and Treatment Plant and equipment.” Source: RevenueBase Database · checked Sep 21, 2026
19	Chemical Treatment Services LTD	Strong evidence	Belfast, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Strong evidence “Chemical Treatment Services Ltd are a Belfast based water treatment company offering competitively priced chemicals and equipment with a prompt and efficient service.” Source: RevenueBase Database · checked Sep 21, 2026
20	Puretec Separations	Strong evidence	Ledbury, United KingdomHQ checked Sep 21, 2026	11-50	9 contacts →
	Strong evidence “PureTec Separations is a leader in technologies and customer experience within the water treatment and product processing industries.” Source: RevenueBase Database · checked Sep 21, 2026
21	B & V Chemicals	Strong evidence	Daventry, United KingdomHQ checked Sep 21, 2026	11-50	9 contacts →
	Strong evidence “B&V Chemicals offer water treatment companies worldwide the opportunity to expand their product range and receive industry leading technical back-up.” Source: RevenueBase Database · checked Sep 21, 2026
22	A Spec Environmental LTD	Strong evidence	Camberley, United KingdomHQ checked Sep 21, 2026	11-50	8 contacts →
	Strong evidence “Our expertise spans the full spectrum of water treatment, including adherence to BSRIA codes and the application of CPC Filtration methodology.” Source: RevenueBase Database · checked Sep 21, 2026
23	Brightwater Environmental LTD	Strong evidence	Denton, United KingdomHQ checked Sep 21, 2026	11-50	8 contacts →
	Strong evidence “BrightWater Environmental Ltd is a UK designer & manufacturer of chemical free water treatment technologies.” Source: RevenueBase Database · checked Sep 21, 2026
24	Capital Water	Strong evidence	Redhill, United KingdomHQ checked Sep 21, 2026	11-50	8 contacts →
	Strong evidence “Capital Water is one of the UK’s leading independent water treatment, water hygiene and compliance service providers.” Source: RevenueBase Database · checked Sep 21, 2026
25	Howlett Associates Water Treatment LTD	Strong evidence	Epsom, United KingdomHQ checked Sep 21, 2026	11-50	8 contacts →
	Strong evidence “Howlett Associates offers a comprehensive range of services including; Legionella Risk Assessment and Legionella Compliance Tasks, Cooling Tower and Steam Boiler Water Treatment…” Source: RevenueBase Database · checked Sep 21, 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: residential 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 residential water treatment companies.
Partial evidence: Its own public description names part of residential 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 residential 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 179 residential water treatment companies based in the United Kingdom

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

As of Sep 21, 2026

43.8%Verified-email coverage

12.2Average contacts per company

1-10Median size (employees)

6.1%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 179 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 residential 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 “residential 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 residential 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 residential 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, 957 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 21, 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 residential 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 residential water treatment companies are there based in the United Kingdom?

RevenueBase identified 179 residential 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 residential water treatment companies?

London leads with 11 headquartered companies, followed by Birmingham (3) and Bristol (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 957 verified decision-maker contacts tracked across these 179 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 21, 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.