Company lists · Data refreshed September 2026

Top 25 Reclaimed water system builders based in the United Kingdom

Name: Reclaimed water system builders 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 69 companies tracked

RevenueBase identified 69 reclaimed water system builders headquartered in the United Kingdom as of September 2026 and tracks 1,795 professional contacts across them, including 1,068 with verified work emails. London is the largest hub.

This list covers reclaimed water system builders 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

69Companies

1,795Contacts tracked

1,068Verified emails

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The 25 largest reclaimed water system builders based in the United Kingdom

Ranked by team size

Top 25 of 69 reclaimed water system builders 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 reclaimed water system builders: 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	MWH Treatment	Partial evidence	Stockport, United KingdomHQ checked Sep 21, 2026	1,001-5,000	879 contacts →
	Partial 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 21, 2026
2	Severn Trent Services	Indirect evidence	Coventry, United KingdomHQ checked Sep 21, 2026	1,001-5,000	137 contacts →
	Indirect 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 21, 2026
3	Alumasc Water Management Solutions	Partial evidence	Kettering, United KingdomHQ checked Sep 21, 2026	51-200	112 contacts →
	Partial evidence “AWMS, part of Alumasc Group, is the first joined-up brand in integrated water management.” 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	GEL Engineering	Indirect evidence	Enfield, United KingdomHQ checked Sep 21, 2026	51-200	70 contacts →
	Indirect evidence “Welcome to Gel Engineering.” Source: RevenueBase Database · checked Sep 21, 2026
6	ESD Joint Venture	Strong evidence	Stepps, United KingdomHQ checked Sep 21, 2026	201-500	58 contacts →
	Strong evidence “How we manage water and wastewater systems now will be critical for our communities and ecosystems for many generations to come.” Source: RevenueBase Database · checked Sep 21, 2026
7	Stormsaver LTD	Strong evidence	Kirklington, United KingdomHQ checked Sep 21, 2026	11-50	44 contacts →
	Strong evidence “The UK's market leading suppliers of Rainwater Harvesting, Greywater Recycling, and Water Reuse Systems.” Source: RevenueBase Database · checked Sep 21, 2026
8	Wcsee Wastewater Marlowe Environmental Services	Partial evidence	Gloucester, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Partial evidence “At WCSEE we collaborate closely with our clients to design and deliver reliable, robust, and future-proofed wastewater systems tailored to site specific requirements.” Source: RevenueBase Database · checked Sep 21, 2026
9	Acwa Services Limited	Partial evidence	Skipton, United KingdomHQ checked Sep 21, 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 21, 2026
10	Viltra	Indirect evidence	Newry, United KingdomHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Viltra specialises in designing, manufacturing and installing wastewater treatment solutions for a wide range of sectors throughout the UK and Ireland, including domestic…” Source: RevenueBase Database · checked Sep 21, 2026
11	WCI Group LTD	Partial evidence	Taunton, United KingdomHQ checked Sep 21, 2026	11-50	14 contacts →
	Partial evidence “WCI Group Ltd is the leading expert in water and wastewater engineering, delivering innovative solutions with over four decades of expertise.” Source: RevenueBase Database · checked Sep 21, 2026
12	Aquabio LTD	Indirect evidence	Worcester, United KingdomHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Aquabio is a pioneering company born with a passion for innovation combined with a strong ethos for environmental sustainability.” Source: RevenueBase Database · checked Sep 21, 2026
13	Bywater Services LTD	Partial evidence	Coalville, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “Established in ByWater Services is a UK specialist in commercial water treatment, water recycling and wastewater management solutions.” Source: RevenueBase Database · checked Sep 21, 2026
14	Plantwork Systems LTD	Strong evidence	Alton, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Strong evidence “Plantwork Systems Ltd (PWS) provides water and wastewater treatment solutions with a strong focus on sustainability, innovation and cost efficiency.” Source: RevenueBase Database · checked Sep 21, 2026
15	Aquality Trading & Consulting LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	13 contacts →
	Partial evidence “Aquality Trading & Consulting Ltd is one of the longest established and leading suppliers of Rainwater Harvesting and Greywater Recycling systems in the UK and France.” Source: RevenueBase Database · checked Sep 21, 2026
16	Esmil Process Systems	Partial evidence	High Wycombe Bucks, United KingdomHQ checked Sep 21, 2026	1-10	12 contacts →
	Partial evidence “ESMIL Process Systems is an award winning Construction company located in United Kingdom.” Source: RevenueBase Database · checked Sep 21, 2026
17	Evergreen Water Solutions LTD	Strong evidence	Hinckley, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Strong evidence “Evergreen Water Solutions works closely with a number of international engineering companies whose expertise is in scalable wastewater treatment systems and containerised…” Source: RevenueBase Database · checked Sep 21, 2026
18	Water Tecnik LTD	Partial evidence	Newry, United KingdomHQ checked Sep 21, 2026	11-50	10 contacts →
	Partial evidence “Water Tecnik specialises in delivering practical, compliant, and cost-effective industrial wastewater and effluent treatment solutions.” Source: RevenueBase Database · checked Sep 21, 2026
19	Kelly Tanks LTD	Partial evidence	Stafford, United KingdomHQ checked Sep 21, 2026	1-10	8 contacts →
	Partial evidence “At Kelly Tanks, we specialise in delivering simple, innovative, and cost-effective water treatment solutions that protect our shared environment.” Source: RevenueBase Database · checked Sep 21, 2026
20	Tech Environment UK LTD	Indirect evidence	Guildford, United KingdomHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “Tech Environment UK Co.” Source: RevenueBase Database · checked Sep 21, 2026
21	Primary Water Group	Partial evidence	Cadishead Manchester, United KingdomHQ checked Sep 21, 2026	11-50	6 contacts →
	Partial evidence “Established in 2006, Primary Water Group operates nationally from offices based in Manchester.” Source: RevenueBase Database · checked Sep 21, 2026
22	MSE Systems LTD	Partial evidence	Chesterfield, United KingdomHQ checked Sep 21, 2026	11-50	5 contacts →
	Partial evidence “MSE Systems are specialists in the design, build and commissioning of industrial wastewater treatment plants, offering a full end-of-pipe solution for the recycling and re-use of…” Source: RevenueBase Database · checked Sep 21, 2026
23	Hydra Clear Process Water	Partial evidence	Warrington, United KingdomHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “Hydra-Clear is an innovative engineering group focused around building bespoke Water Treatment Solutions for the UK’s leading brands.” Source: RevenueBase Database · checked Sep 21, 2026
24	Stenlakes Limited	Indirect evidence	South Petherwin, United KingdomHQ checked Sep 21, 2026	11-50	4 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
25	Kirton Water Treatment Services	Partial evidence	Melton Mowbray, United KingdomHQ checked Sep 21, 2026	11-50	4 contacts →
	Partial evidence “Kirton design and build state-of-the-art solutions that help industrial, commercial and domestic clients use water safely, more efficiently and in compliance with ever increasing…” 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: reclaimed water system builders. 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 reclaimed water system builders.
Partial evidence: Its own public description names part of reclaimed water system builders, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name reclaimed water system builders. 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 69 reclaimed water system builders based in the United Kingdom

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Reclaimed water system builders based in the United Kingdom at a glance

As of Sep 21, 2026

59.5%Verified-email coverage

26.0Average contacts per company

11-50Median size (employees)

5.8%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 69 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 reclaimed water system builders, 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 “reclaimed water system builders”. 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 reclaimed water system builders), 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 reclaimed water system builders, 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, 1,068 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 reclaimed water system builders, 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 reclaimed water system builders are there based in the United Kingdom?

RevenueBase identified 69 reclaimed water system builders 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?

MWH Treatment, headquartered in Stockport, tops this list with the largest team on record.

Which city has the most reclaimed water system builders?

London leads with 4 headquartered companies, followed by Newry (3) and Cadishead Manchester (2).

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 1,068 verified decision-maker contacts tracked across these 69 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.