Company lists · Data refreshed September 2026

Top 25 Hydrogeological consultants based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 192 companies tracked

RevenueBase identified 192 hydrogeological consultants headquartered in London, United Kingdom as of September 2026 and tracks 8,971 professional contacts across them, including 3,059 with verified work emails. London is the largest hub.

This list covers hydrogeological consultants headquartered in London, 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

192Companies

8,971Contacts tracked

3,059Verified emails

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The 25 largest hydrogeological consultants based in London, United Kingdom

Ranked by team size

Top 25 of 192 hydrogeological consultants based in London, 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	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
4	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
5	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
6	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
7	Campbellreith	Indirect evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
8	WALSH	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	110 contacts →
	Partial evidence “Walsh is a B Corp Certified structural, civil and geotechnical engineering consultancy specialising in complex developments on constrained urban sites.” Source: RevenueBase Database · checked Sep 21, 2026
9	Mrag LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 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 21, 2026
10	Hurley Palmer Flatt	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	91 contacts →
	Partial evidence “In 2019, Hurley Palmer Flatt, the UK’s leading independent multidisciplinary engineering consultancy, joined global design firm HDR.” Source: RevenueBase Database · checked Sep 21, 2026
11	FHP Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	86 contacts →
	Partial evidence “FHP Group is a leading Mechanical, Electrical, Public Health, Energy and Sustainability engineering consultancy with over 50 years of experience!” Source: RevenueBase Database · checked Sep 21, 2026
12	Dr. Sauer & Partners	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	63 contacts →
	Indirect evidence “Dr.” Source: RevenueBase Database · checked Sep 21, 2026
13	OPC	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	58 contacts →
	Partial evidence “OPC is a leading global energy consultancy specialising in providing clients with top-tier expertise and innovative solutions across the upstream E&P, Gas and CO2 storage domains…” Source: RevenueBase Database · checked Sep 21, 2026
14	WBD Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	51 contacts →
	Partial evidence “WBD Group is a leading multidisciplinary engineering consultancy based in Central London.” Source: RevenueBase Database · checked Sep 21, 2026
15	RGA	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	n/a	50 contacts →
	Indirect evidence “RGA was established with a clear purpose: to enhance the performance of the UK water sector through business change enabled by technology.” Source: RevenueBase Database · checked Sep 21, 2026
16	VEDA	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	48 contacts →
	Partial evidence “VEDA Associates is an independent, multidisciplinary engineering consultancy driven by a passion for problem solving and technical excellence.” Source: RevenueBase Database · checked Sep 21, 2026
17	Cares Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	48 contacts →
	Partial evidence “We are an international Engineering consultant with a team of over 40 chartered engineers, environmentalists, Maritime experts, and technicians across West Africa, UK, and…” Source: RevenueBase Database · checked Sep 21, 2026
18	OTB Engineering	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	42 contacts →
	Indirect evidence “OTB is renowned for its expertise and experience in tunnel, construction and geotechnical engineering, and rail assurance.” Source: RevenueBase Database · checked Sep 21, 2026
19	Sari Consulting LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	41 contacts →
	Partial evidence “A dynamic international engineering consultancy company providing project management, technical assistance, capacity-building and design services for the development of…” Source: RevenueBase Database · checked Sep 21, 2026
20	London Bridge Associates LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	38 contacts →
	Partial evidence “LBA is an engineering consultancy specialising in tunnelling, underground works and heavy civil engineering construction.” Source: RevenueBase Database · checked Sep 21, 2026
21	TB Associates	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	32 contacts →
	Partial evidence “TB Associates was founded in the United Kingdom in 2004 and is a research-based engineering consultancy company.” Source: RevenueBase Database · checked Sep 21, 2026
22	Solis Marine	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	29 contacts →
	Indirect evidence “Solis Marine was established in 2012 to provide independent expert technical services to the shipping and wider maritime industries.” Source: RevenueBase Database · checked Sep 21, 2026
23	Geotechnical Consulting Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	29 contacts →
	Partial evidence “Geotechnical Consulting Group (GCG) is one of the world’s leading independent geotechnical engineering consultancies, recognised for delivering innovative, research driven…” Source: RevenueBase Database · checked Sep 21, 2026
24	Twin And Earth LTD	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	28 contacts →
	Partial evidence “Twin and Earth is an independent engineering and sustainability consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
25	Geowynd	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	28 contacts →
	Indirect evidence “Data-driven geosolutions to ensure ground risks are mitigated and design opportunities are realised.” 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 192 hydrogeological consultants based in London, United Kingdom

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Hydrogeological consultants based in London, United Kingdom at a glance

As of Sep 21, 2026

34.1%Verified-email coverage

46.7Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

113

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 192 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 London, 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 London 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, 3,059 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 in the United Kingdom

Hydrogeological consultants in London192
Hydrogeological consultants in Aberdeen45
Hydrogeological consultants in Glasgow27
Hydrogeological consultants in Manchester27
Hydrogeological consultants in Nottingham27
Hydrogeological consultants in Bristol26

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 London, United Kingdom?

RevenueBase identified 192 hydrogeological consultants headquartered in London, 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 3,059 verified decision-maker contacts tracked across these 192 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.