Company lists · Data refreshed September 2026

Top 25 Water infrastructure construction companies based in the United Kingdom

Name: Water infrastructure 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 19, 2026 242 companies tracked

RevenueBase identified 242 water infrastructure construction companies headquartered in the United Kingdom as of September 2026 and tracks 17,020 professional contacts across them, including 6,795 with verified work emails. London is the largest hub.

This list covers water infrastructure 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 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

242Companies

17,020Contacts tracked

6,795Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest water infrastructure construction companies based in the United Kingdom

Ranked by team size

Top 25 of 242 water infrastructure construction 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 water infrastructure 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	Thames Water	Partial evidence	Reading, United KingdomHQ checked Sep 19, 2026	1,001-5,000	5,648 contacts →
	Partial evidence “Thames Water is the UK’s biggest water and wastewater services provider, providing 2.7 billion litres of drinking water and safely removing 4.6 billion litres of wastewater every…” Source: RevenueBase Database · checked Sep 19, 2026
2	Murphy	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	1,001-5,000	3,095 contacts →
	Strong evidence “Murphy is a leading international, multi-disciplined engineering and construction company founded in 1951 that improves life by delivering world-class infrastructure.” Source: RevenueBase Database · checked Sep 19, 2026
3	Clancy	Indirect evidence	Harefield, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,218 contacts →
	Indirect evidence “The Clancy Group was founded in 1958 by Michael Clancy as M.J.” Source: RevenueBase Database · checked Sep 19, 2026
4	Morrison Water Services	Indirect evidence	Stevenage, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,153 contacts →
	Indirect evidence “With a significant national workforce operating daily in local communities, we support our clients to keep their assets resilient ensuring customer taps flow, and all wastewater…” Source: RevenueBase Database · checked Sep 19, 2026
5	MWH Treatment	Strong evidence	Stockport, United KingdomHQ checked Sep 19, 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 19, 2026
6	WGM Engineering LTD	Partial evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	201-500	329 contacts →
	Partial evidence “A self-delivery design and build partner supplying sustainable solutions to the water sector.” Source: RevenueBase Database · checked Sep 19, 2026
7	Sapphire Utility Solutions LTD	Indirect evidence	Bamber Bridge, United KingdomHQ checked Sep 19, 2026	1,001-5,000	324 contacts →
	Indirect evidence “Sapphire Utility Solutions has quickly become a trusted name in the utility, transport and highways sectors, known for our capabilities in delivering innovative solutions to meet…” Source: RevenueBase Database · checked Sep 19, 2026
8	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
9	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
10	Hydro International	Strong evidence	Clevedon, United KingdomHQ checked Sep 19, 2026	201-500	166 contacts →
	Strong 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
11	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
12	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
13	Enpure	Partial evidence	Birmingham, United KingdomHQ checked Sep 19, 2026	51-200	113 contacts →
	Partial 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
14	Alumasc Water Management Solutions	Partial evidence	Kettering, United KingdomHQ checked Sep 19, 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 19, 2026
15	Crowder Consulting	Partial evidence	Birkenhead, United KingdomHQ checked Sep 19, 2026	51-200	90 contacts →
	Partial evidence “Crowder Consulting provides innovative engineering consultancy services and software solutions to the water industry, specialising in water supply, water distribution and sewer…” Source: RevenueBase Database · checked Sep 19, 2026
16	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
17	Siltbuster LTD	Partial evidence	Monmouth, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Partial 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
18	GEL Engineering	Indirect evidence	Enfield, United KingdomHQ checked Sep 19, 2026	51-200	70 contacts →
	Indirect evidence “Welcome to Gel Engineering.” Source: RevenueBase Database · checked Sep 19, 2026
19	Willow Pumps Limited	Partial evidence	Kent, United KingdomHQ checked Sep 19, 2026	51-200	63 contacts →
	Partial evidence “Willow Pumps provide expert services for all your pump, drainage, waste and clean water needs.” Source: RevenueBase Database · checked Sep 19, 2026
20	Claret Civil Engineering LTD	Indirect evidence	Bury St Edmunds, United KingdomHQ checked Sep 19, 2026	51-200	60 contacts →
	Indirect evidence “From it’s inception in November 1994, Claret Civil Engineering has expanded to become a leading Tier 1 and Tier 2 contractor operating across a range of sectors including clean…” Source: RevenueBase Database · checked Sep 19, 2026
21	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
22	Peter Duffy Limited	Strong evidence	Wakefield, United KingdomHQ checked Sep 19, 2026	201-500	58 contacts →
	Strong evidence “Peter Duffy Ltd (a United Infrastructure Group company) is a civil engineering, construction, utilities and plant hire company with a track record for quality and service since…” Source: RevenueBase Database · checked Sep 19, 2026
23	BSG	Partial evidence	Maghera, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Partial 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	Kelly Formwork UK LTD	Strong evidence	Essex, United KingdomHQ checked Sep 19, 2026	51-200	43 contacts →
	Strong evidence “Kelly Formwork UK Ltd have established themselves as a leading contractor in the field of Civil Engineering, Water Infrastructure and major Highways projects.” Source: RevenueBase Database · checked Sep 19, 2026
25	Veriflo Limited	Partial evidence	East Malling, United KingdomHQ checked Sep 19, 2026	11-50	39 contacts →
	Partial evidence “Veriflo Ltd - a professional strategic project management company, specialising in clean water asset services.” 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: water infrastructure 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 water infrastructure construction companies.
Partial evidence: Its own public description names part of water infrastructure construction companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water infrastructure 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 242 water infrastructure construction companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 6,795 reachable decision-makers.

Free signup · no credit card

View the full list →

Water infrastructure construction companies based in the United Kingdom at a glance

As of Sep 19, 2026

39.9%Verified-email coverage

70.3Average contacts per company

11-50Median size (employees)

5.4%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 242 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 water infrastructure 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 “water infrastructure 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 water infrastructure 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 water infrastructure 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, 6,795 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 water infrastructure 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 water infrastructure construction companies are there based in the United Kingdom?

RevenueBase identified 242 water infrastructure 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?

Thames Water, headquartered in Reading, tops this list with the largest team on record.

Which city has the most water infrastructure construction companies?

London leads with 13 headquartered companies, followed by Manchester (8) and Glasgow (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 6,795 verified decision-maker contacts tracked across these 242 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.

Ready to reach these companies? Verified emails and direct dials for all 242 water infrastructure construction companies based in the United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Water infrastructure construction companies by geography

Browse the directory

Browse: Companies home · All United Kingdom lists · All Water infrastructure construction companies lists · New lists

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.