Company lists · Data refreshed September 2026

Top 25 Wastewater engineering companies based in the United Kingdom

Name: Wastewater engineering 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 19, 2026 436 companies tracked

RevenueBase identified 436 wastewater engineering companies headquartered in the United Kingdom as of September 2026 and tracks 8,104 professional contacts across them, including 3,155 with verified work emails. London is the largest hub.

This list covers wastewater engineering 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 19, 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 19, 2026 86% judged on-target in blind review

436Companies

8,104Contacts tracked

3,155Verified emails

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The 25 largest wastewater engineering companies based in the United Kingdom

Ranked by team size

Top 25 of 436 wastewater engineering companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to wastewater engineering 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 19, 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 19, 2026
2	RSE	Partial evidence	Inverness Highlands, United KingdomHQ checked Sep 19, 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 19, 2026
3	Eric Wright Water LTD	Strong evidence	Preston, United KingdomHQ checked Sep 19, 2026	201-500	193 contacts →
	Strong evidence “Eric Wright Water Ltd (part of the Eric Wright Group) is a multi-disciplinary engineering and construction company working in the water and wastewater industry.” Source: RevenueBase Database · checked Sep 19, 2026
4	Onsite Central Limited	Indirect evidence	Worcester, United KingdomHQ checked Sep 19, 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 19, 2026
5	Biwater	Partial evidence	Surrey, United KingdomHQ checked Sep 19, 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 19, 2026
6	Hydro International	Indirect evidence	Clevedon, United KingdomHQ checked Sep 19, 2026	201-500	166 contacts →
	Indirect evidence “Hydro International, a CRH Company, provides advanced products, services and expertise to help municipal, industrial and construction customers to improve their water management…” Source: RevenueBase Database · checked Sep 19, 2026
7	Severn Trent Services	Indirect evidence	Coventry, United KingdomHQ checked Sep 19, 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 19, 2026
8	Envolve Infrastructure	Indirect evidence	Cardiff Road, United KingdomHQ checked Sep 19, 2026	201-500	136 contacts →
	Indirect evidence “We’re envolve, specialist civil engineers.” Source: RevenueBase Database · checked Sep 19, 2026
9	Enpure	Strong evidence	Birmingham, United KingdomHQ checked Sep 19, 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 19, 2026
10	Alumasc Water Management Solutions	Indirect evidence	Kettering, United KingdomHQ checked Sep 19, 2026	51-200	112 contacts →
	Indirect evidence “AWMS, part of Alumasc Group, is the first joined-up brand in integrated water management.” Source: RevenueBase Database · checked Sep 19, 2026
11	Nijhuis Saur Industries UK And Ireland	Partial evidence	United Kingdom & Ireland, United KingdomHQ checked Sep 19, 2026	201-500	76 contacts →
	Partial 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 19, 2026
12	Envirogen Group	Indirect evidence	Alfreton, United KingdomHQ checked Sep 19, 2026	201-500	75 contacts →
	Indirect evidence “Envirogen Group is a global leader in industrial water treatment and process filtration solutions.” Source: RevenueBase Database · checked Sep 19, 2026
13	Siltbuster LTD	Indirect evidence	Monmouth, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect 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 19, 2026
14	Richard Alan	Partial evidence	Dewsbury, United KingdomHQ checked Sep 19, 2026	51-200	74 contacts →
	Partial 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 19, 2026
15	Jacopa Limited	Partial evidence	West Bromwich, United KingdomHQ checked Sep 19, 2026	51-200	73 contacts →
	Partial 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 19, 2026
16	GEL Engineering	Partial evidence	Enfield, United KingdomHQ checked Sep 19, 2026	51-200	70 contacts →
	Partial evidence “Welcome to Gel Engineering.” Source: RevenueBase Database · checked Sep 19, 2026
17	Glanville Environmental	Indirect evidence	Ivybridge, United KingdomHQ checked Sep 19, 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 19, 2026
18	Willow Pumps Limited	Indirect evidence	Kent, United KingdomHQ checked Sep 19, 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 19, 2026
19	Waterco Datrys	Partial evidence	Ruthin, United KingdomHQ checked Sep 19, 2026	11-50	59 contacts →
	Partial evidence “Waterco Datrys is a leading consultancy in water and environmental engineering, formed through the merger of Waterco and Datrys in 2024.” Source: RevenueBase Database · checked Sep 19, 2026
20	ESD Joint Venture	Partial evidence	Stepps, United KingdomHQ checked Sep 19, 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 19, 2026
21	Advanced Water Technologies	Indirect evidence	Warrington, United KingdomHQ checked Sep 19, 2026	51-200	52 contacts →
	Indirect 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 19, 2026
22	Hydrotec Water Treatment Specialists	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 19, 2026	51-200	50 contacts →
	Indirect evidence “Hydrotec is the UK’s leading company in the design and manufacture of water treatment products for the building services industry.” Source: RevenueBase Database · checked Sep 19, 2026
23	BSG	Strong evidence	Maghera, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Strong 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 19, 2026
24	T-T Pumps LTD	Partial evidence	Woore, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Partial evidence “Established in 1959, T-T started out as a general engineering company before growing to consist of 6 divisions – T-T Pumps, T-T Controls and Automation, T-T Flow Valves, T-T…” Source: RevenueBase Database · checked Sep 19, 2026
25	Huber Technology UK & Ireland	Indirect evidence	Chippenham, United KingdomHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “HUBER Technology was incorporated in the UK in 1993 as a wholly owned subsidiary of Huber SE- Huber UK & Ireland Limited, the manufacturers of the ROTAMAT range of waste water…” Source: RevenueBase Database · checked Sep 19, 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: wastewater engineering 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 wastewater engineering companies.
Partial evidence: Its own public description names part of wastewater engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater engineering 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 436 wastewater engineering companies based in the United Kingdom

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Wastewater engineering companies based in the United Kingdom at a glance

As of Sep 19, 2026

38.9%Verified-email coverage

18.6Average contacts per company

11-50Median size (employees)

2.8%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

172

11-50

169

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 436 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 wastewater engineering 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 “wastewater engineering 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 wastewater engineering 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 wastewater engineering 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, 3,155 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 19, 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 wastewater engineering 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 wastewater engineering companies are there based in the United Kingdom?

RevenueBase identified 436 wastewater engineering 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 wastewater engineering companies?

London leads with 12 headquartered companies, followed by Manchester (9) and Coventry (6).

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 3,155 verified decision-maker contacts tracked across these 436 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 19, 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.