Company lists · Data refreshed September 2026

Top 25 Hydrogeological consultants based in the United Kingdom

Name: Hydrogeological consultants based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,876 companies tracked

RevenueBase identified 1,876 hydrogeological consultants headquartered in the United Kingdom as of September 2026 and tracks 31,335 professional contacts across them, including 13,285 with verified work emails. London is the largest hub.

This list covers hydrogeological consultants 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 21, 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 21, 2026 86% judged on-target in blind review

1,876Companies

31,335Contacts tracked

13,285Verified emails

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The 25 largest hydrogeological consultants based in the United Kingdom

Ranked by team size

Top 25 of 1,876 hydrogeological consultants based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to hydrogeological consultants: 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	Keller	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	5,001-10,000	3,960 contacts →
	Indirect evidence “Every day, people around the world live, work and play on ground prepared by Keller, the world's largest geotechnical specialist contractor.” Source: RevenueBase Database · checked Sep 21, 2026
2	Hoare LEA	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	1,103 contacts →
	Partial evidence “We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.” Source: RevenueBase Database · checked Sep 21, 2026
3	Binnies	Indirect evidence	Redhill, United KingdomHQ checked Sep 21, 2026	501-1,000	842 contacts →
	Indirect evidence “Together with our strategic partners, we can address everything from supporting vulnerable customers, water quality, asset performance and leak detection, to integrated planning…” Source: RevenueBase Database · checked Sep 21, 2026
4	Ricardo PLC	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	670 contacts →
	Indirect evidence “Click the 'Follow' button and explore careers at Ricardo on our 'Jobs' and 'Life' tabs and at careers.ricardo.com.” Source: RevenueBase Database · checked Sep 21, 2026
5	KBR Granherne	Partial evidence	Leatherhead, United KingdomHQ checked Sep 21, 2026	501-1,000	648 contacts →
	Partial evidence “KBR Consulting is one of the world's foremost engineering consultancies specializing in the hydrocarbon and energy industry.” Source: RevenueBase Database · checked Sep 21, 2026
6	Dalcour Maclaren	Indirect evidence	Chesterton, United KingdomHQ checked Sep 21, 2026	501-1,000	589 contacts →
	Indirect evidence “Dalcour Maclaren: delivering land, stakeholder and environmental solutions.” Source: RevenueBase Database · checked Sep 21, 2026
7	Waterman Group	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
8	CEFAS	Partial evidence	Lowestoft, United KingdomHQ checked Sep 21, 2026	501-1,000	559 contacts →
	Partial evidence “Cefas (Centre for Environment, Fisheries and Aquaculture Science) is an internationally renowned aquatic scientific research and consultancy centre.” Source: RevenueBase Database · checked Sep 21, 2026
9	Gardline Limited	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 21, 2026	501-1,000	545 contacts →
	Indirect evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 21, 2026
10	Fairhurst	Indirect evidence	Glasgow, United KingdomHQ checked Sep 21, 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 21, 2026
11	WGM Engineering LTD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 21, 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 21, 2026
12	WRC Group	Partial evidence	Swindon, United KingdomHQ checked Sep 21, 2026	201-500	226 contacts →
	Partial evidence “Water Research Centre (WRc) is a trusted provider of consultancy, technical services, accreditation schemes, research, innovation and training to customers around the globe.” Source: RevenueBase Database · checked Sep 21, 2026
13	Arbtech	Partial evidence	Chester, United KingdomHQ checked Sep 21, 2026	51-200	218 contacts →
	Partial evidence “Founded in 2005, Arbtech has grown into the UK's leading arboricultural and ecological consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
14	Geotechnical Engineering Limited	Indirect evidence	Gloucester, United KingdomHQ checked Sep 21, 2026	51-200	187 contacts →
	Indirect evidence “Geotechnical is the leading independent provider of ground investigation in the UK, offering comprehensive intrusive surveys since 1961.” Source: RevenueBase Database · checked Sep 21, 2026
15	JURU	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	176 contacts →
	Partial evidence “Founded in 2015, Juru is an international engineering and consultancy firm with a mission to solve engineering and environmental problems.” Source: RevenueBase Database · checked Sep 21, 2026
16	Clancy Consulting	Partial evidence	Manchester, United KingdomHQ checked Sep 21, 2026	51-200	168 contacts →
	Partial evidence “We’re a specialist engineering consultancy working nationally to deliver industry-leading engineering services and creative engineering designs that work for today and for future…” Source: RevenueBase Database · checked Sep 21, 2026
17	JNP Group	Partial evidence	Amersham, United KingdomHQ checked Sep 21, 2026	51-200	166 contacts →
	Partial evidence “With over 40 years experience JNP Group deliver highly professional, integrated efficient design and consultancy solutions from inception to completion, irrespective of project…” Source: RevenueBase Database · checked Sep 21, 2026
18	Lucion	Indirect evidence	Gateshead, United KingdomHQ checked Sep 21, 2026	501-1,000	162 contacts →
	Indirect evidence “We're not just service providers; we're your long-term partners in creating a sustainable, compliant, and efficient future for your assets.” Source: RevenueBase Database · checked Sep 21, 2026
19	IGNE	Indirect evidence	Ross-on-wye, United KingdomHQ checked Sep 21, 2026	201-500	159 contacts →
	Indirect evidence “Igne is a leading UK specialist delivering integrated and stand-alone services across ground investigation, specialist drilling, UXO risk mitigation, materials testing…” Source: RevenueBase Database · checked Sep 21, 2026
20	Aqua Consultants	Partial evidence	Leeds, United KingdomHQ checked Sep 21, 2026	51-200	156 contacts →
	Partial evidence “Aqua Consultants provide tailored environmental consultancy to broaden your thinking, lead transformation, and achieve successful outcomes.” Source: RevenueBase Database · checked Sep 21, 2026
21	Harley Haddow	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 21, 2026	51-200	146 contacts →
	Indirect evidence “Harley Haddow are Civil, Structural, Mechanical, Electrical, Building Performance & Sustainability and Geotechnical Consulting Engineers.” Source: RevenueBase Database · checked Sep 21, 2026
22	Structural Soils	Indirect evidence	Bristol, United KingdomHQ checked Sep 21, 2026	201-500	137 contacts →
	Indirect evidence “Structural Soils offer comprehensive ground Investigation services to a range of clients in the public and private sector.” Source: RevenueBase Database · checked Sep 21, 2026
23	Meinhardt UK And Ireland	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	133 contacts →
	Partial evidence “Meinhardt (UK) is a leading international multidisciplinary engineering consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
24	Thomson Environmental Consultants	Partial evidence	Guildford, United KingdomHQ checked Sep 21, 2026	51-200	133 contacts →
	Partial evidence “Thomson Environmental Consultants are experts in environmental compliance with offices in Guildford, Leeds, Cardiff, Birmingham and Manchester.” Source: RevenueBase Database · checked Sep 21, 2026
25	Apollo	Partial evidence	Aberdeen, United KingdomHQ checked Sep 21, 2026	51-200	129 contacts →
	Partial evidence “Apollo is a leading engineering and advisory consultancy working across sustainable infrastructure, marine energies, oil and gas, technical placements and digital solutions.” Source: RevenueBase Database · checked Sep 21, 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: hydrogeological consultants. 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 hydrogeological consultants.
Partial evidence: Its own public description names part of hydrogeological consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydrogeological consultants. 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 1,876 hydrogeological consultants based in the United Kingdom

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Hydrogeological consultants based in the United Kingdom at a glance

As of Sep 21, 2026

42.4%Verified-email coverage

16.7Average contacts per company

1-10Median size (employees)

10.2%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

1,163

11-50

526

51-200

133

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 1,876 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 hydrogeological consultants, 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 “hydrogeological consultants”. 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 hydrogeological consultants), 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 hydrogeological consultants, 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, 13,285 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 21, 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.

Hydrogeological consultants by metro

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 hydrogeological consultants, 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 hydrogeological consultants are there based in the United Kingdom?

RevenueBase identified 1,876 hydrogeological consultants 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?

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

Which city has the most hydrogeological consultants?

London leads with 192 headquartered companies, followed by Aberdeen (45) and Glasgow (27).

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 13,285 verified decision-maker contacts tracked across these 1,876 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 21, 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.