Company lists · Data refreshed September 2026

Top 25 Water utility companies based in the United Kingdom

Name: Water utility 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 22, 2026 99 companies tracked

RevenueBase identified 99 water utility companies headquartered in the United Kingdom as of September 2026 and tracks 34,084 professional contacts across them, including 12,723 with verified work emails. London is the largest hub.

This list covers water utility 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 22, 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 22, 2026 86% judged on-target in blind review

99Companies

34,084Contacts tracked

12,723Verified emails

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The 25 largest water utility companies based in the United Kingdom

Ranked by team size

Top 25 of 99 water utility companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to water utility 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	Pentair	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	5,001-10,000	6,636 contacts →
	Partial evidence “At Pentair, we help the world sustainably move, improve, and enjoy water, life’s most essential resource.” Source: RevenueBase Database · checked Sep 22, 2026
2	Thames Water	Partial evidence	Reading, United KingdomHQ checked Sep 22, 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 22, 2026
3	Severn Trent	Partial evidence	Coventry, United KingdomHQ checked Sep 22, 2026	5,001-10,000	5,563 contacts →
	Partial evidence “Water is wonderful.” Source: RevenueBase Database · checked Sep 22, 2026
4	Anglian Water Services	Partial evidence	Huntingdon, United KingdomHQ checked Sep 22, 2026	5,001-10,000	3,430 contacts →
	Partial evidence “Anglian Water supply water and water recycling services to more than six million domestic and business customers in the east of England and Hartlepool.” Source: RevenueBase Database · checked Sep 22, 2026
5	DŴR Cymru Welsh Water	Indirect evidence	Cardiff, United KingdomHQ checked Sep 22, 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 22, 2026
6	NWG Northumbrian Water Group	Partial evidence	Durham, United KingdomHQ checked Sep 22, 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 22, 2026
7	Morrison Water Services	Indirect evidence	Stevenage, United KingdomHQ checked Sep 22, 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 22, 2026
8	Affinity Water	Partial evidence	Hatfield, United KingdomHQ checked Sep 22, 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 22, 2026
9	Water Plus	Partial evidence	Stoke-on-trent, United KingdomHQ checked Sep 22, 2026	201-500	302 contacts →
	Partial evidence “We're the UK's largest business water retailer, providing organisations of all sizes with billing, account management, meter reading and water efficiency services.” Source: RevenueBase Database · checked Sep 22, 2026
10	Bristol Water	Partial evidence	Bristol, United KingdomHQ checked Sep 22, 2026	201-500	299 contacts →
	Partial evidence “Bristol Water is part of Pennon Group plc.” Source: RevenueBase Database · checked Sep 22, 2026
11	Portsmouth Water	Partial evidence	Havant, United KingdomHQ checked Sep 22, 2026	201-500	252 contacts →
	Partial evidence “Portsmouth Water have been supplying water to Portsmouth and the surrounding area since 1857.” Source: RevenueBase Database · checked Sep 22, 2026
12	South Staffs Water	Partial evidence	Walsall, United KingdomHQ checked Sep 22, 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 22, 2026
13	WAVE	Indirect evidence	Durham, United KingdomHQ checked Sep 22, 2026	201-500	214 contacts →
	Indirect evidence “Welcome to Wave.” Source: RevenueBase Database · checked Sep 22, 2026
14	Severn Trent Services	Indirect evidence	Coventry, United KingdomHQ checked Sep 22, 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 22, 2026
15	South Staffordshire PLC	Partial evidence	Walsall, United KingdomHQ checked Sep 22, 2026	1,001-5,000	96 contacts →
	Partial evidence “South Staffordshire Plc is an integrated services group that operates two regulated water supply businesses and offers a range of complementary services and products through its…” Source: RevenueBase Database · checked Sep 22, 2026
16	Nijhuis Saur Industries UK And Ireland	Partial evidence	United Kingdom & Ireland, United KingdomHQ checked Sep 22, 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 22, 2026
17	Water2business	Partial evidence	Bristol, United KingdomHQ checked Sep 22, 2026	51-200	51 contacts →
	Partial evidence “water2business is a leading retailer of water and waste water management solutions to businesses and organisations across England and Scotland.” Source: RevenueBase Database · checked Sep 22, 2026
18	Panton Mcleod	Partial evidence	Selkirk, United KingdomHQ checked Sep 22, 2026	11-50	35 contacts →
	Partial evidence “Our teams are dedicated to supporting our clients to protect, maintain and improve water quality within treatment and distribution systems.” Source: RevenueBase Database · checked Sep 22, 2026
19	Watertight Management	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 22, 2026	51-200	31 contacts →
	Partial evidence “Watertight Management has established itself as a leader in the provision of Clean and Waste water management services.” Source: RevenueBase Database · checked Sep 22, 2026
20	M & S Water Services Utilities Limited	Strong evidence	Luton, United KingdomHQ checked Sep 22, 2026	51-200	29 contacts →
	Strong evidence “M&S Water Services (Utilities) Limited has been trading since 1997 when the company was set up to bridge the gap between water companies and the customer that domestic plumbers…” Source: RevenueBase Database · checked Sep 22, 2026
21	Acwa Services Limited	Partial evidence	Skipton, United KingdomHQ checked Sep 22, 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 22, 2026
22	Pure Utilities	Strong evidence	Preston, United KingdomHQ checked Sep 22, 2026	11-50	22 contacts →
	Strong evidence “Pure Utilities is a Licensed Provider offering business users in Scotland a fresh choice for their water, waste water & drainage services.” Source: RevenueBase Database · checked Sep 22, 2026
23	SES Business Water	Indirect evidence	Dorking, United KingdomHQ checked Sep 22, 2026	51-200	21 contacts →
	Indirect evidence “Why customers choose us * Great-value tariffs, on-line payment system and discounted Direct Debit payment offers.* Consolidated e-billing to significantly reduce administration…” Source: RevenueBase Database · checked Sep 22, 2026
24	Advanced Water Infrastructure Networks	Partial evidence	Braintree, United KingdomHQ checked Sep 22, 2026	11-50	19 contacts →
	Partial evidence “Advanced Water Infrastructure Networks (AWIN) provides clean water services and wastewater services to customers in new-build residential developments, as well as smooth asset…” Source: RevenueBase Database · checked Sep 22, 2026
25	Conservaqua	Partial evidence	Fetcham, United KingdomHQ checked Sep 22, 2026	11-50	16 contacts →
	Partial evidence “In April 2017, the largest competitive water retail market in the world opened for business, bringing the biggest change to the water sector since privatisation.” Source: RevenueBase Database · checked Sep 22, 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 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 utility companies.
Partial evidence: Its own public description names part of water utility companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water utility 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 99 water utility companies based in the United Kingdom

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Water utility companies based in the United Kingdom at a glance

As of Sep 22, 2026

37.3%Verified-email coverage

344.3Average contacts per company

11-50Median size (employees)

5.1%Largest-city concentration · London

Sep 22, 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 99 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 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 utility 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 utility 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 utility 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, 12,723 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 22, 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 utility 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 utility companies are there based in the United Kingdom?

RevenueBase identified 99 water utility 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?

Pentair, headquartered in London, tops this list with the largest team on record.

Which city has the most water utility companies?

London leads with 5 headquartered companies, followed by Hatfield (3) and Walsall (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 12,723 verified decision-maker contacts tracked across these 99 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 22, 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.