Company lists · Data refreshed September 2026

Top 25 Sewage system construction companies based in the United Kingdom

Name: Sewage system construction 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 17, 2026 141 companies tracked

RevenueBase identified 141 sewage system construction companies headquartered in the United Kingdom as of September 2026 and tracks 3,433 professional contacts across them, including 1,332 with verified work emails. London is the largest hub.

This list covers sewage system construction 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 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

141Companies

3,433Contacts tracked

1,332Verified emails

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The 25 largest sewage system construction companies based in the United Kingdom

Ranked by team size

Top 25 of 141 sewage system construction companies 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 sewage system construction 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	MWH Treatment	Indirect evidence	Stockport, United KingdomHQ checked Sep 17, 2026	1,001-5,000	879 contacts →
	Indirect 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
2	Onsite Central Limited	Indirect evidence	Worcester, United KingdomHQ checked Sep 17, 2026	201-500	178 contacts →
	Indirect evidence “Originally established in 1977, OnSite is a South Staffordshire Group owned company that has grown through strategic acquisition and organic expansion to become one of the UK's…” Source: RevenueBase Database · checked Sep 17, 2026
3	Severn Trent Services	Indirect evidence	Coventry, United KingdomHQ checked Sep 17, 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 17, 2026
4	Envolve Infrastructure	Indirect evidence	Cardiff Road, United KingdomHQ checked Sep 17, 2026	201-500	136 contacts →
	Indirect evidence “We’re envolve, specialist civil engineers.” Source: RevenueBase Database · checked Sep 17, 2026
5	Enpure	Indirect evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	51-200	113 contacts →
	Indirect 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
6	GEL Engineering	Indirect evidence	Enfield, United KingdomHQ checked Sep 17, 2026	51-200	70 contacts →
	Indirect evidence “Welcome to Gel Engineering.” Source: RevenueBase Database · checked Sep 17, 2026
7	Willow Pumps Limited	Indirect evidence	Kent, United KingdomHQ checked Sep 17, 2026	51-200	63 contacts →
	Indirect evidence “Willow Pumps provide expert services for all your pump, drainage, waste and clean water needs.” Source: RevenueBase Database · checked Sep 17, 2026
8	ESD Joint Venture	Partial evidence	Stepps, United KingdomHQ checked Sep 17, 2026	201-500	58 contacts →
	Partial 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 17, 2026
9	BSG	Indirect evidence	Maghera, United KingdomHQ checked Sep 17, 2026	51-200	49 contacts →
	Indirect evidence “With over 40 year’s industry experience, we are a leading engineering contractor with specialist expertise in the water and wastewater sector.” Source: RevenueBase Database · checked Sep 17, 2026
10	Atac Solutions LTD	Indirect evidence	Maidstone, United KingdomHQ checked Sep 17, 2026	11-50	44 contacts →
	Indirect evidence “ATAC Solutions Ltd is a leading UK environmental services company specialising in wastewater services and wastewater equipment on a capital purchase or hire basis.” Source: RevenueBase Database · checked Sep 17, 2026
11	Wcsee Wastewater Marlowe Environmental Services	Partial evidence	Gloucester, United KingdomHQ checked Sep 17, 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 17, 2026
12	Acwa Services Limited	Indirect evidence	Skipton, United KingdomHQ checked Sep 17, 2026	11-50	22 contacts →
	Indirect evidence “ACWA Services Limited is a Municipal and Industrial Water and Wastewater Treatment company located in Skipton, United Kingdom.” Source: RevenueBase Database · checked Sep 17, 2026
13	Lanes Group PLC	Indirect evidence	Leeds, United KingdomHQ checked Sep 17, 2026	1,001-5,000	22 contacts →
	Indirect evidence “Lanes Group is more than a wastewater solutions provider.” Source: RevenueBase Database · checked Sep 17, 2026
14	KEE	Indirect evidence	Aylesbury, United KingdomHQ checked Sep 17, 2026	51-200	21 contacts →
	Indirect evidence “KEE KEE is a globally recognised brand operating within in the industrial, commercial and domestic wastewater treatment industries.” Source: RevenueBase Database · checked Sep 17, 2026
15	Oneline Surveys LTD	Partial evidence	Wellington, United KingdomHQ checked Sep 17, 2026	11-50	20 contacts →
	Partial evidence “We help commercial water and sewage infrastructure owners keep their networks flowing and reduce their risk, by identifying and resolving complex issues and maintaining assets in…” Source: RevenueBase Database · checked Sep 17, 2026
16	Serious Waste Management LTD	Indirect evidence	Burton Upon Trent, United KingdomHQ checked Sep 17, 2026	11-50	18 contacts →
	Indirect evidence “WE ARE SERIOUS.” Source: RevenueBase Database · checked Sep 17, 2026
17	Te-Tech Process Solutions	Indirect evidence	Southampton, United KingdomHQ checked Sep 17, 2026	501-1,000	16 contacts →
	Indirect evidence “Te-Tech Process Solutions Ltd has been established to provide a dedicated service to existing and new clients in the municipal water, industrial and commercial sectors.” Source: RevenueBase Database · checked Sep 17, 2026
18	Viltra	Indirect evidence	Newry, United KingdomHQ checked Sep 17, 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 17, 2026
19	WCI Group LTD	Indirect evidence	Taunton, United KingdomHQ checked Sep 17, 2026	11-50	14 contacts →
	Indirect 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 17, 2026
20	Owls Hall Environmental LTD	Indirect evidence	Braintree, United KingdomHQ checked Sep 17, 2026	11-50	14 contacts →
	Indirect evidence “Providing expert solutions for both residential and commercial environments.” Source: RevenueBase Database · checked Sep 17, 2026
21	Plantwork Systems LTD	Partial evidence	Alton, United KingdomHQ checked Sep 17, 2026	11-50	13 contacts →
	Partial 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 17, 2026
22	Esmil Process Systems	Strong evidence	High Wycombe Bucks, United KingdomHQ checked Sep 17, 2026	1-10	12 contacts →
	Strong evidence “ESMIL Process Systems is an award winning Construction company located in United Kingdom.” Source: RevenueBase Database · checked Sep 17, 2026
23	Clearmasters	Indirect evidence	Horley, United KingdomHQ checked Sep 17, 2026	11-50	11 contacts →
	Indirect evidence “At Clearmasters Environmental, we specialise in liquid waste removal, drainage maintenance, and wastewater solutions.” Source: RevenueBase Database · checked Sep 17, 2026
24	Alliance Group Solutions Limited	Indirect evidence	Kirkby In Ashfield, United KingdomHQ checked Sep 17, 2026	51-200	11 contacts →
	Indirect evidence “Welcome to Alliance Group Solutions Limited.” Source: RevenueBase Database · checked Sep 17, 2026
25	Iwjs Group	Indirect evidence	Colchester, United KingdomHQ checked Sep 17, 2026	1-10	11 contacts →
	Indirect evidence 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: sewage system construction 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 sewage system construction companies.
Partial evidence: Its own public description names part of sewage system construction companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sewage system construction 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 141 sewage system construction companies based in the United Kingdom

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Sewage system construction companies based in the United Kingdom at a glance

As of Sep 17, 2026

38.8%Verified-email coverage

24.3Average contacts per company

11-50Median size (employees)

4.3%Largest-city concentration · London

Sep 17, 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 141 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 sewage system construction 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 “sewage system construction 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 sewage system construction 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 sewage system construction 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, 1,332 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.

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 sewage system construction 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 sewage system construction companies are there based in the United Kingdom?

RevenueBase identified 141 sewage system construction 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?

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

Which city has the most sewage system construction companies?

London leads with 6 headquartered companies, followed by Newry (4) and Bridgwater (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 1,332 verified decision-maker contacts tracked across these 141 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.