Company lists · Data refreshed September 2026

Top 25 Aquatic engineering firms based in the United Kingdom

Name: Aquatic engineering firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 499 companies tracked

RevenueBase identified 499 aquatic engineering firms headquartered in the United Kingdom as of September 2026 and tracks 22,474 professional contacts across them, including 7,971 with verified work emails. London is the largest hub.

This list covers aquatic engineering firms 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 30, 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 30, 2026 86% judged on-target in blind review

499Companies

22,474Contacts tracked

7,971Verified emails

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The 25 largest aquatic engineering firms based in the United Kingdom

Ranked by team size

Top 25 of 499 aquatic engineering firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to aquatic engineering firms: 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	Costain Group PLC	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	3,785 contacts →
	Indirect evidence “Costain helps to improve people’s lives by creating connected, sustainable infrastructure that enables people and the planet thrive.” Source: RevenueBase Database · checked Sep 30, 2026
2	Murphy	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	3,095 contacts →
	Partial 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 30, 2026
3	FM Conway LTD	Indirect evidence	Sevenoaks, United KingdomHQ checked Sep 30, 2026	1,001-5,000	974 contacts →
	Indirect evidence “FM Conway is a leading infrastructure services company delivering vital services in transportation, the built environment and open spaces for communities and businesses.” Source: RevenueBase Database · checked Sep 30, 2026
4	MWH Treatment	Indirect evidence	Stockport, United KingdomHQ checked Sep 30, 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 30, 2026
5	Amcogiffen	Indirect evidence	Barnsley, United KingdomHQ checked Sep 30, 2026	1,001-5,000	845 contacts →
	Indirect evidence “Who are we?” Source: RevenueBase Database · checked Sep 30, 2026
6	Waterman Group	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	563 contacts →
	Partial evidence “Waterman Group is a multidisciplinary consultancy providing sustainable solutions to meet the planning, engineering design and project delivery needs of the property…” Source: RevenueBase Database · checked Sep 30, 2026
7	Volkerstevin	Partial evidence	Preston, United KingdomHQ checked Sep 30, 2026	501-1,000	509 contacts →
	Partial evidence “As part of the €6.6 billion VolkerWessels group, VolkerStevin provides complex engineering solutions to the water, energy, marine infrastructure, flood and coastal protection…” Source: RevenueBase Database · checked Sep 30, 2026
8	Fairhurst	Indirect evidence	Glasgow, United KingdomHQ checked Sep 30, 2026	201-500	437 contacts →
	Indirect evidence “Welcome to Fairhurst: Fairhurst is a Limited Liability Partnership (LLP) of Consulting Engineers practicing in the UK, employing circa 400 staff in 16 principal offices.” Source: RevenueBase Database · checked Sep 30, 2026
9	Alun Griffiths Contractors LTD	Partial evidence	Abergavenny, United KingdomHQ checked Sep 30, 2026	201-500	412 contacts →
	Partial evidence “Welcome to / Croeso i Griffiths We are a sustainable civil engineering contractor that helps connect communities through road, rail, water, and utilities.” Source: RevenueBase Database · checked Sep 30, 2026
10	WGM Engineering LTD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 30, 2026	201-500	329 contacts →
	Indirect evidence “A self-delivery design and build partner supplying sustainable solutions to the water sector.” Source: RevenueBase Database · checked Sep 30, 2026
11	Project Centre LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	190 contacts →
	Indirect evidence “Project Centre, part of Marston Holdings, is a multidisciplinary infrastructure and place consultancy shaping sustainable spaces across the UK.” Source: RevenueBase Database · checked Sep 30, 2026
12	RJ Mcleod Contractors Limited	Partial evidence	Glasgow, United KingdomHQ checked Sep 30, 2026	201-500	172 contacts →
	Partial evidence “RJ McLeod stands as one of the country’s leading civil engineering and building contractors.” Source: RevenueBase Database · checked Sep 30, 2026
13	Hydro International	Indirect evidence	Clevedon, United KingdomHQ checked Sep 30, 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 30, 2026
14	Rendel Limited	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	150 contacts →
	Partial evidence “Rendel celebrated its 185th Anniversary in 2024, making us one of the oldest civil and structural engineering companies in the UK.” Source: RevenueBase Database · checked Sep 30, 2026
15	Severn Trent Services	Indirect evidence	Coventry, United KingdomHQ checked Sep 30, 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 30, 2026
16	Mackenzie Construction	Indirect evidence	Glasgow, United KingdomHQ checked Sep 30, 2026	201-500	136 contacts →
	Indirect evidence “Mackenzie Construction is a contractor positioned to design and construct infrastructure and building assets for public and private sector clients.” Source: RevenueBase Database · checked Sep 30, 2026
17	Envolve Infrastructure	Indirect evidence	Cardiff Road, United KingdomHQ checked Sep 30, 2026	201-500	136 contacts →
	Indirect evidence “We’re envolve, specialist civil engineers.” Source: RevenueBase Database · checked Sep 30, 2026
18	Mackley	Indirect evidence	Small Dole, United KingdomHQ checked Sep 30, 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 30, 2026
19	Brookbanks	Partial evidence	United KingdomHQ checked Sep 30, 2026	51-200	113 contacts →
	Partial evidence “Project Consultant & Development Partner: Civil, Structural, Mechanical & Electrical Engineering Designs; Highways, Transportation & Environmental; Cost & Commercial & Development…” Source: RevenueBase Database · checked Sep 30, 2026
20	Campbellreith	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	113 contacts →
	Indirect evidence “CampbellReith is an independent firm of consulting engineers providing structural, civil, geotechnical, land quality, development planning and transport planning services.” Source: RevenueBase Database · checked Sep 30, 2026
21	Aecom Engineering Uk&i	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	10001+	110 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
22	Land Water	Indirect evidence	Guildford, United KingdomHQ checked Sep 30, 2026	201-500	109 contacts →
	Indirect evidence “Land + Water is more than just a dredging company.” Source: RevenueBase Database · checked Sep 30, 2026
23	CR Civil Engineering	Partial evidence	Loughborough, United KingdomHQ checked Sep 30, 2026	201-500	107 contacts →
	Partial evidence “CR Civil Engineering Ltd is based in the East Midlands and work throughout the UK.” Source: RevenueBase Database · checked Sep 30, 2026
24	Mcphillips Wellington Limited	Partial evidence	Telford, United KingdomHQ checked Sep 30, 2026	201-500	103 contacts →
	Partial evidence “McPhillips (Wellington) Limited is an award winning civil engineering and building contractor that has built a strong reputation for providing outstanding solutions to public and…” Source: RevenueBase Database · checked Sep 30, 2026
25	Mrag LTD	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	103 contacts →
	Partial evidence “Established in the UK in 1986, MRAG Ltd is a consultancy company dedicated to promoting sustainable use of aquatic resources through sound integrated management policies and…” Source: RevenueBase Database · checked Sep 30, 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: aquatic engineering firms. 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 aquatic engineering firms.
Partial evidence: Its own public description names part of aquatic engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name aquatic engineering firms. 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 499 aquatic engineering firms based in the United Kingdom

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Aquatic engineering firms based in the United Kingdom at a glance

As of Sep 30, 2026

35.5%Verified-email coverage

45.0Average contacts per company

11-50Median size (employees)

12.0%Largest-city concentration · London

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

244

11-50

145

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 499 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 aquatic engineering firms, 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 “aquatic engineering firms”. 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 aquatic engineering firms), 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 aquatic engineering firms, 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, 7,971 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 30, 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.

Aquatic engineering firms by metro

Aquatic engineering firms in London60

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 aquatic engineering firms, 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 aquatic engineering firms are there based in the United Kingdom?

RevenueBase identified 499 aquatic engineering firms 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?

Costain Group PLC, headquartered in London, tops this list with the largest team on record.

Which city has the most aquatic engineering firms?

London leads with 60 headquartered companies, followed by Glasgow (8) and Bristol (7).

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 7,971 verified decision-maker contacts tracked across these 499 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 30, 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.