Company lists · Data refreshed September 2026

Top 25 Hydrological survey companies based in the United Kingdom

Name: Hydrological survey 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 20, 2026 133 companies tracked

RevenueBase identified 133 hydrological survey companies headquartered in the United Kingdom as of September 2026 and tracks 1,264 professional contacts across them, including 556 with verified work emails. London is the largest hub.

This list covers hydrological survey 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 20, 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 20, 2026 86% judged on-target in blind review

133Companies

1,264Contacts tracked

556Verified emails

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The 25 largest hydrological survey companies based in the United Kingdom

Ranked by team size

Top 25 of 133 hydrological survey companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to hydrological survey 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	Mrag LTD	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	103 contacts →
	Indirect 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 20, 2026
2	EGS International	Partial evidence	Bordon, United KingdomHQ checked Sep 20, 2026	51-200	74 contacts →
	Partial evidence “EGS International Ltd (EGSi) is part of a leading international group of companies specialising in marine surveys.” Source: RevenueBase Database · checked Sep 20, 2026
3	Teledyne Valeport	Indirect evidence	Totnes, United KingdomHQ checked Sep 20, 2026	51-200	43 contacts →
	Indirect evidence “Valeport is an independently owned manufacturer of Oceanographic & Hydrometric Equipment and Instrumentation.” Source: RevenueBase Database · checked Sep 20, 2026
4	Storm Geomatics Limited	Indirect evidence	Shipston On Stour, United KingdomHQ checked Sep 20, 2026	11-50	31 contacts →
	Indirect evidence “Measurement experts who use innovation to understand river functions and provide knowledge to inform projects that reduce flooding and improve natural habitats.” Source: RevenueBase Database · checked Sep 20, 2026
5	Aegaea Limited	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Indirect evidence “Aegaea provides expertise in water, civils and environment including discharge of conditions for outline and full planning.” Source: RevenueBase Database · checked Sep 20, 2026
6	Irrigation Engineers LTD	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 20, 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 20, 2026
7	Landscope Engineering	Partial evidence	Church Stretton, United KingdomHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “Established in 2004, LandScope Engineering has become one of the leading survey companies in the UK specialising in integrated survey solutions above ground, below ground and…” Source: RevenueBase Database · checked Sep 20, 2026
8	Aspect Land & Hydrographic Surveys LTD	Partial evidence	Irvine, United KingdomHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “Aspect Land & Hydrographic Surveys Ltd are one of the UK’s leading independent coastal survey companies, with extensive experience and a proven track record in providing…” Source: RevenueBase Database · checked Sep 20, 2026
9	40seven Limited	Partial evidence	Leeds, United KingdomHQ checked Sep 20, 2026	51-200	26 contacts →
	Partial evidence “40SEVEN are one of the UK’s largest surveying companies and with three offices are able to offer genuine nationwide coverage.” Source: RevenueBase Database · checked Sep 20, 2026
10	Envireau Water	Indirect evidence	Melbourne, United KingdomHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Envireau Water is one of the UK's leading independent consultancies specialising in water management and environmental regulation.” Source: RevenueBase Database · checked Sep 20, 2026
11	MCL Consulting	Indirect evidence	Belfast, United KingdomHQ checked Sep 20, 2026	11-50	18 contacts →
	Indirect evidence “Office Locations Belfast Based Consultancy Firm About Us MCL Consulting always operate as a team.” Source: RevenueBase Database · checked Sep 20, 2026
12	Water Environment Limited	Indirect evidence	Surbiton, United KingdomHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “Water Environment Limited provides technical consulting services, specific to the water and environmental sectors of engineering.” Source: RevenueBase Database · checked Sep 20, 2026
13	European Geophysical Services LTD	Partial evidence	Hadnall, United KingdomHQ checked Sep 20, 2026	11-50	17 contacts →
	Partial evidence “European Geophysical Services was established in 1994 and is a leading borehole geophysical logging and video surveying company providing a large range of measurements and…” Source: RevenueBase Database · checked Sep 20, 2026
14	Hydro International Data, Insight & Analysis	Indirect evidence	Reading, United KingdomHQ checked Sep 20, 2026	201-500	16 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 20, 2026
15	Edenvale Young Associates	Indirect evidence	Bristol, United KingdomHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “Edenvale Young is a Civil Engineering and Scientific Consultancy specialising in the fluvial, coastal and maritime environment.” Source: RevenueBase Database · checked Sep 20, 2026
16	OGI Groundwater Specialists LTD	Indirect evidence	Durham, United KingdomHQ checked Sep 20, 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 20, 2026
17	Penny Anderson Associates LTD	Indirect evidence	Buxton, United KingdomHQ checked Sep 20, 2026	11-50	14 contacts →
	Indirect evidence “Penny Anderson Associates has provided expert advice on ecology, hydrology and sustainable land management since the 1970s and has built up a reputation for professional integrity…” Source: RevenueBase Database · checked Sep 20, 2026
18	Caley Water	Partial evidence	Edinburgh, United KingdomHQ checked Sep 20, 2026	11-50	12 contacts →
	Partial 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 20, 2026
19	Gondolin Land & Water LTD	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 20, 2026	11-50	12 contacts →
	Indirect 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 20, 2026
20	Richard Allitt Associates LTD	Indirect evidence	Staplefield, United KingdomHQ checked Sep 20, 2026	11-50	10 contacts →
	Indirect evidence “Richard Allitt Associates is a leading provider of hydraulic engineering and flood risk consultancy for the urban drainage industry.” Source: RevenueBase Database · checked Sep 20, 2026
21	Ultrabeam Hydrographic	Partial evidence	Hayle, United KingdomHQ checked Sep 20, 2026	11-50	10 contacts →
	Partial evidence “Ultrabeam is a multi-award-winning company specialising in high-definition marine survey and asset inspection.” Source: RevenueBase Database · checked Sep 20, 2026
22	Caintech LTD	Indirect evidence	Inverness, United KingdomHQ checked Sep 20, 2026	11-50	10 contacts →
	Indirect evidence “Caintech Ltd was first established in August 1988 and worked solely within the offshore Oil sector until May 2005 when we expanded into construction, land and hydrographic…” Source: RevenueBase Database · checked Sep 20, 2026
23	CMS Geoscience LTD	Indirect evidence	Penryn, United KingdomHQ checked Sep 20, 2026	1-10	10 contacts →
	Indirect evidence “CMS began with a simple mission: to provide the marine industry with precise and dependable data that builds confidence from the seabed up.” Source: RevenueBase Database · checked Sep 20, 2026
24	Hydrofix	Indirect evidence	Tattenhall, United KingdomHQ checked Sep 20, 2026	1-10	9 contacts →
	Indirect evidence “Hydrofix specialises in providing full project lifecycle hydrographic and geophysical support services to the offshore construction industry and service support providers.” Source: RevenueBase Database · checked Sep 20, 2026
25	Ocean Phoenix International Limited	Partial evidence	Inverurie, United KingdomHQ checked Sep 20, 2026	1-10	9 contacts →
	Partial evidence “Established in 2020, Ocean Phoenix International Ltd is a specialist Marine and Hydrographic Survey support company which has been set up by Offshore Industry veteran Peter…” Source: RevenueBase Database · checked Sep 20, 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: hydrological survey 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 hydrological survey companies.
Partial evidence: Its own public description names part of hydrological survey companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydrological survey 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 133 hydrological survey companies based in the United Kingdom

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Hydrological survey companies based in the United Kingdom at a glance

As of Sep 20, 2026

44.0%Verified-email coverage

9.5Average contacts per company

1-10Median size (employees)

5.3%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 133 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 hydrological survey 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 “hydrological survey 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 hydrological survey 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 hydrological survey 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, 556 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 20, 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 hydrological survey 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 hydrological survey companies are there based in the United Kingdom?

RevenueBase identified 133 hydrological survey 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?

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

Which city has the most hydrological survey companies?

London leads with 7 headquartered companies, followed by Wallingford (5) and Belfast (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 556 verified decision-maker contacts tracked across these 133 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 20, 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.