Company lists · Data refreshed September 2026

Top 25 Water resources engineering companies based in the United Kingdom

Name: Water resources 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 16, 2026 157 companies tracked

RevenueBase identified 157 water resources engineering companies headquartered in the United Kingdom as of September 2026 and tracks 2,817 professional contacts across them, including 904 with verified work emails. London is the largest hub.

This list covers water resources 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 16, 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 16, 2026 86% judged on-target in blind review

157Companies

2,817Contacts tracked

904Verified emails

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The 25 largest water resources engineering companies based in the United Kingdom

Ranked by team size

Top 25 of 157 water resources engineering companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to water resources 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	Hydro International	Partial evidence	Clevedon, United KingdomHQ checked Sep 16, 2026	201-500	166 contacts →
	Partial 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 16, 2026
2	Severn Trent Services	Indirect evidence	Coventry, United KingdomHQ checked Sep 16, 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 16, 2026
3	Mackley	Indirect evidence	Small Dole, United KingdomHQ checked Sep 16, 2026	51-200	116 contacts →
	Indirect evidence “Mackley provides a comprehensive range of services from conception through construction to project delivery.” Source: RevenueBase Database · checked Sep 16, 2026
4	Crowder Consulting	Strong evidence	Birkenhead, United KingdomHQ checked Sep 16, 2026	51-200	90 contacts →
	Strong 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 16, 2026
5	Waterco Datrys	Strong evidence	Ruthin, United KingdomHQ checked Sep 16, 2026	11-50	59 contacts →
	Strong 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 16, 2026
6	ESD Joint Venture	Partial evidence	Stepps, United KingdomHQ checked Sep 16, 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 16, 2026
7	Water Direct	Partial evidence	Colchester, United KingdomHQ checked Sep 16, 2026	51-200	51 contacts →
	Partial evidence “As the UK’s foremost provider of alternative water services, we’re dedicated to ensuring that every business and household has access to a quality water supply – no matter what.” Source: RevenueBase Database · checked Sep 16, 2026
8	Cbec Eco-Engineering UK & Europe	Partial evidence	Inverness, United KingdomHQ checked Sep 16, 2026	11-50	36 contacts →
	Partial evidence “CBEC eco-engineering is a leading UK environmental consultant specialising in the provision of eco-engineering solutions for the aquatic environment.” Source: RevenueBase Database · checked Sep 16, 2026
9	Salix River And Wetland	Indirect evidence	Thetford, United KingdomHQ checked Sep 16, 2026	11-50	33 contacts →
	Indirect evidence “River restoration and erosion control specialists Salix provide sustainable solutions to the challenges found in soil erosion control and river restoration projects.” Source: RevenueBase Database · checked Sep 16, 2026
10	Aegaea Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	28 contacts →
	Partial evidence “Aegaea provides expertise in water, civils and environment including discharge of conditions for outline and full planning.” Source: RevenueBase Database · checked Sep 16, 2026
11	Irrigation Engineers LTD	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 16, 2026	1-10	28 contacts →
	Indirect evidence “Irrigation Engineers Ltd is a consultancy with international experience having worked throughout Europe, Africa, the Middle East and Asia.” Source: RevenueBase Database · checked Sep 16, 2026
12	Artesia Consulting Limited	Partial evidence	Yate, United KingdomHQ checked Sep 16, 2026	11-50	25 contacts →
	Partial evidence “At Artesia, our mission is to make the water sector more progressive, inclusive, and resilient.” Source: RevenueBase Database · checked Sep 16, 2026
13	Envireau Water	Partial evidence	Melbourne, United KingdomHQ checked Sep 16, 2026	11-50	21 contacts →
	Partial evidence “Envireau Water is one of the UK's leading independent consultancies specialising in water management and environmental regulation.” Source: RevenueBase Database · checked Sep 16, 2026
14	Stuart Wells	Indirect evidence	Shropham, United KingdomHQ checked Sep 16, 2026	11-50	18 contacts →
	Indirect evidence “Stuart Wells boasts over 30 years’ experience in construction dewatering and well services.” Source: RevenueBase Database · checked Sep 16, 2026
15	Water Environment Limited	Strong evidence	Surbiton, United KingdomHQ checked Sep 16, 2026	11-50	17 contacts →
	Strong evidence “Water Environment Limited provides technical consulting services, specific to the water and environmental sectors of engineering.” Source: RevenueBase Database · checked Sep 16, 2026
16	Stillwater Associates LTD	Strong evidence	Reigate, United KingdomHQ checked Sep 16, 2026	11-50	16 contacts →
	Strong evidence “Stillwater Associates is dedicated to reservoir safety and water engineering services.” Source: RevenueBase Database · checked Sep 16, 2026
17	Cain Bio-Engineering LTD	Partial evidence	Breamore, United KingdomHQ checked Sep 16, 2026	11-50	15 contacts →
	Partial evidence “Simon Cain founded the company Cain Bio-Engineering in 2003 with the aim of restoring aquatic environments to a state of optimal biodiversity.” Source: RevenueBase Database · checked Sep 16, 2026
18	Edenvale Young Associates	Partial evidence	Bristol, United KingdomHQ checked Sep 16, 2026	11-50	15 contacts →
	Partial evidence “Edenvale Young is a Civil Engineering and Scientific Consultancy specialising in the fluvial, coastal and maritime environment.” Source: RevenueBase Database · checked Sep 16, 2026
19	OGI Groundwater Specialists LTD	Indirect evidence	Durham, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Indirect evidence “OGI has more than 30 years of experience in providing groundwater related services to clients and contractors in the United Kingdom and abroad.” Source: RevenueBase Database · checked Sep 16, 2026
20	WCI Group LTD	Strong evidence	Taunton, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Strong 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 16, 2026
21	Miles Water Engineering LTD	Strong evidence	Great Ashfield, United KingdomHQ checked Sep 16, 2026	11-50	13 contacts →
	Strong evidence “Miles Water Engineering are specialists in design, construction and renovation of water-related projects.” Source: RevenueBase Database · checked Sep 16, 2026
22	Caley Water	Strong evidence	Edinburgh, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Strong evidence “Caley Water is a water and environmental consultancy that offers a range of specialist hydraulic modelling, data survey management and civil engineering design services.” Source: RevenueBase Database · checked Sep 16, 2026
23	Gondolin Land & Water LTD	Strong evidence	Edinburgh, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Strong evidence “Gondolin Land & Water Ltd is a growing Environmental and Civil Engineering Consultancy business based in Scotland with coverage throughout England, Scotland and Ireland.” Source: RevenueBase Database · checked Sep 16, 2026
24	FPS Environmental LTD	Strong evidence	Nottingham, United KingdomHQ checked Sep 16, 2026	1-10	11 contacts →
	Strong evidence “As part of The FPS Group, FPS Environmental Ltd delivers engineering excellence within the flood, water, and environmental sectors.” Source: RevenueBase Database · checked Sep 16, 2026
25	Chemsol Group	Strong evidence	Conwy, United KingdomHQ checked Sep 16, 2026	11-50	11 contacts →
	Strong evidence “The Chemsol Group design, install and maintain both private & commercial water engineering projects across England and Wales.” Source: RevenueBase Database · checked Sep 16, 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 resources 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 water resources engineering companies.
Partial evidence: Its own public description names part of water resources engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name water resources 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 157 water resources engineering companies based in the United Kingdom

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Water resources engineering companies based in the United Kingdom at a glance

As of Sep 16, 2026

32.1%Verified-email coverage

17.9Average contacts per company

1-10Median size (employees)

5.7%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 157 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 resources 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 “water resources 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 water resources 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 water resources 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, 904 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 16, 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 resources 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 water resources engineering companies are there based in the United Kingdom?

RevenueBase identified 157 water resources 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?

Hydro International, headquartered in Clevedon, tops this list with the largest team on record.

Which city has the most water resources engineering companies?

London leads with 9 headquartered companies, followed by Wallingford (6) and Manchester (5).

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 904 verified decision-maker contacts tracked across these 157 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 16, 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.