Company lists · Data refreshed September 2026

Top 25 Water utility infrastructure contractors based in the United Kingdom

Name: Water utility infrastructure contractors 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 346 companies tracked

RevenueBase identified 346 water utility infrastructure contractors headquartered in the United Kingdom as of September 2026 and tracks 25,384 professional contacts across them, including 11,099 with verified work emails. London is the largest hub.

This list covers water utility infrastructure contractors 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

346Companies

25,384Contacts tracked

11,099Verified emails

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The 25 largest water utility infrastructure contractors based in the United Kingdom

Ranked by team size

Top 25 of 346 water utility infrastructure contractors 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 utility infrastructure contractors: 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	Severn Trent	Partial evidence	Coventry, United KingdomHQ checked Sep 19, 2026	5,001-10,000	5,563 contacts →
	Partial evidence “Water is wonderful.” Source: RevenueBase Database · checked Sep 19, 2026
3	DŴR Cymru Welsh Water	Indirect evidence	Cardiff, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,868 contacts →
	Indirect evidence “Bath-times, half-times, party-times, meeting-times, and cooking-times.” Source: RevenueBase Database · checked Sep 19, 2026
4	NWG Northumbrian Water Group	Partial evidence	Durham, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,629 contacts →
	Partial evidence “NWG (Northumbrian Water Group) provides water and sewerage services to 2.7 million people in the North East of England as Northumbrian Water, and water services to 1.5 million…” Source: RevenueBase Database · checked Sep 19, 2026
5	Lanes Group	Partial evidence	Leeds, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,219 contacts →
	Partial evidence “Lanes Group is a leading provider of specialist drainage, utility, and asset maintenance services.” Source: RevenueBase Database · checked Sep 19, 2026
6	Affinity Water	Partial evidence	Hatfield, United KingdomHQ checked Sep 19, 2026	1,001-5,000	928 contacts →
	Partial evidence “Our vision is to be the leading community-focused water company.” Source: RevenueBase Database · checked Sep 19, 2026
7	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
8	IPSUM	Partial evidence	Chorley, United KingdomHQ checked Sep 19, 2026	501-1,000	737 contacts →
	Partial evidence “At Ipsum, we provide specialist engineering services across the UK’s regulated water and energy companies and private sector businesses.” Source: RevenueBase Database · checked Sep 19, 2026
9	Selwood LTD	Partial evidence	Eastleigh, United KingdomHQ checked Sep 19, 2026	501-1,000	477 contacts →
	Partial evidence “Selwood is your trusted partner in mission-critical water handling, storage, and treatment solutions across the UK.” Source: RevenueBase Database · checked Sep 19, 2026
10	Sapphire Utility Solutions LTD	Partial evidence	Bamber Bridge, United KingdomHQ checked Sep 19, 2026	1,001-5,000	324 contacts →
	Partial 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
11	South Staffs Water	Partial evidence	Walsall, United KingdomHQ checked Sep 19, 2026	501-1,000	238 contacts →
	Partial evidence “South Staffs Water is a private water company formed in 1853 to provide water to the inhabitants of the Black Country.” Source: RevenueBase Database · checked Sep 19, 2026
12	Cappagh Group Of Companies	Indirect evidence	Wimbledon, United KingdomHQ checked Sep 19, 2026	501-1,000	193 contacts →
	Indirect evidence “You have probably benefitted from a service we have helped fix, build or maintain if you live or have visited the southern region of the UK.” Source: RevenueBase Database · checked Sep 19, 2026
13	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
14	Hydrosave UK LTD	Partial evidence	Kettering, United KingdomHQ checked Sep 19, 2026	201-500	164 contacts →
	Partial evidence “We are a leading specialist pipeline inspection, leak detection, valve maintenance and water audit company.” Source: RevenueBase Database · checked Sep 19, 2026
15	Ferns Group	Strong evidence	West Farleigh, United KingdomHQ checked Sep 19, 2026	501-1,000	147 contacts →
	Strong evidence “Ferns is one of the largest independent utility infrastructure services providers in the south of the UK.” Source: RevenueBase Database · checked Sep 19, 2026
16	PN Daly Limited	Indirect evidence	Rochdale, United KingdomHQ checked Sep 19, 2026	501-1,000	141 contacts →
	Indirect evidence “P.N.” Source: RevenueBase Database · checked Sep 19, 2026
17	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
18	S&r Construction LTD	Strong evidence	Brierley Hill, United KingdomHQ checked Sep 19, 2026	201-500	137 contacts →
	Strong evidence “S&R Construction was founded in 1998 with a view to providing affordable, sustainable gas, water and electric mains and utility installation services for a broad range of clients.” Source: RevenueBase Database · checked Sep 19, 2026
19	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
20	Advance Construction Scotland Limited	Indirect evidence	Bellshill, United KingdomHQ checked Sep 19, 2026	51-200	115 contacts →
	Indirect evidence “ADVANCE CONSTRUCTION (SCOTLAND) LIMITED is a construction company based out of CALDERGROVE HOUSE 4 LINNET WAY STRATHCLYDE BUSINESS PARK, BELLSHILL, United Kingdom.” Source: RevenueBase Database · checked Sep 19, 2026
21	SQS	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	114 contacts →
	Strong evidence “SQS is a leading utility solutions provider serving the energy, gas, water, local authority and commercial sectors in London and the South East from our head office in North…” Source: RevenueBase Database · checked Sep 19, 2026
22	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
23	Doocey Group	Strong evidence	Tipton, United KingdomHQ checked Sep 19, 2026	201-500	105 contacts →
	Strong evidence “Doocey Group Utility Infrastructure Contractor operating nationally in the construction Industry.” Source: RevenueBase Database · checked Sep 19, 2026
24	KLT Utilities LTD	Strong evidence	Hemel Hempstead, United KingdomHQ checked Sep 19, 2026	201-500	85 contacts →
	Strong evidence “Southern England’s leading multi-utility contractor” Source: RevenueBase Database · checked Sep 19, 2026
25	Infrastructure Gateway LTD	Strong evidence	Kettering, United KingdomHQ checked Sep 19, 2026	51-200	76 contacts →
	Strong evidence “Infrastructure Gateway Ltd have been working with developers providing them with the expertise to deliver the utilities on construction projects for over 20 years.” 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 utility infrastructure contractors. 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 utility infrastructure contractors.
Partial evidence: Its own public description names part of water utility infrastructure contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water utility infrastructure contractors. 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 346 water utility infrastructure contractors based in the United Kingdom

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Water utility infrastructure contractors based in the United Kingdom at a glance

As of Sep 19, 2026

43.7%Verified-email coverage

73.4Average contacts per company

11-50Median size (employees)

7.5%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

115

11-50

126

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 346 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 utility infrastructure contractors, 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 utility infrastructure contractors”. 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 utility infrastructure contractors), 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 utility infrastructure contractors, 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, 11,099 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.

Water utility infrastructure contractors by metro

Water utility infrastructure contractors in London26

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 utility infrastructure contractors, 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 utility infrastructure contractors are there based in the United Kingdom?

RevenueBase identified 346 water utility infrastructure contractors 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 utility infrastructure contractors?

London leads with 26 headquartered companies, followed by Manchester (12) and Barnsley (4).

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 11,099 verified decision-maker contacts tracked across these 346 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.