Company lists · Data refreshed September 2026

Top 25 Hydrology consulting firms based in the United Kingdom

Name: Hydrology consulting 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 3, 2026 158 companies tracked

RevenueBase identified 158 hydrology consulting firms headquartered in the United Kingdom as of September 2026 and tracks 1,064 professional contacts across them, including 449 with verified work emails and 53 with mobile numbers. London is the largest hub.

This list covers hydrology consulting 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 3, 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 3, 2026 86% judged on-target in blind review

158Companies

1,064Contacts tracked

449Verified emails

53Mobile numbers

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The 25 largest hydrology consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 158 hydrology consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. RevenueBase Smart Search rates how each company's information relates to hydrology consulting 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	Mrag LTD	Indirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	100 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 3, 2026
2	Waterco Datrys	Indirect evidence	Ruthin, United KingdomHQ checked Sep 3, 2026	11-50	59 contacts →
	Indirect 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 3, 2026
3	Cbec Eco-Engineering UK & Europe	Indirect evidence	Inverness, United KingdomHQ checked Sep 3, 2026	11-50	37 contacts →
	Indirect 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 3, 2026
4	OIL Plus LTD	Indirect evidence	Newbury, United KingdomHQ checked Sep 3, 2026	11-50	36 contacts →
	Indirect evidence “As a world-leading independent consultancy in oil and gas field water management, our team provides on-site fluid sampling, laboratory analysis, specialty monitoring equipment for…” Source: RevenueBase Database · checked Sep 3, 2026
5	Storm Geomatics Limited	Indirect evidence	Shipston On Stour, United KingdomHQ checked Sep 3, 2026	11-50	32 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 3, 2026
6	RAB Consultants	Indirect evidence	Lichfield, United KingdomHQ checked Sep 3, 2026	11-50	29 contacts →
	Indirect evidence “RAB are dedicated to increasing resilience and reducing flood risk.” Source: RevenueBase Database · checked Sep 3, 2026
7	Aegaea Limited	Indirect evidence	London, United KingdomHQ checked Sep 3, 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 3, 2026
8	Irrigation Engineers LTD	Indirect evidence	High Wycombe, United KingdomHQ checked Sep 3, 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 3, 2026
9	Mccloy Consulting Limited	Partial evidence	Newtownabbey, United KingdomHQ checked Sep 3, 2026	11-50	26 contacts →
	Partial evidence “McCloy Consulting Limited, a specialist water focussed multidisciplinary with expertise in nature-based solutions, flood risk, geo-environmental, landscape design, ecology…” Source: RevenueBase Database · checked Sep 3, 2026
10	Gavia Environmental LTD	Partial evidence	Perth, United KingdomHQ checked Sep 3, 2026	11-50	24 contacts →
	Partial evidence “Gavia Environmental Ltd is a specialist environmental consultancy based in Perthshire, Scotland, providing ecological and hydrological services.” Source: RevenueBase Database · checked Sep 3, 2026
11	Envireau Water	Indirect evidence	Melbourne, United KingdomHQ checked Sep 3, 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 3, 2026
12	EAS	Indirect evidence	Stanstead Abbotts, United KingdomHQ checked Sep 3, 2026	11-50	21 contacts →
	Indirect evidence “EAS provides expert advice on transport, flood-risk and infrastructure planning for new development.” Source: RevenueBase Database · checked Sep 3, 2026
13	MCL Consulting	Partial evidence	Belfast, United KingdomHQ checked Sep 3, 2026	11-50	18 contacts →
	Partial evidence “Office Locations Belfast Based Consultancy Firm About Us MCL Consulting always operate as a team.” Source: RevenueBase Database · checked Sep 3, 2026
14	Water Environment Limited	Partial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	17 contacts →
	Partial evidence “Water Environment Limited provides technical consulting services, specific to the water and environmental sectors of engineering.” Source: RevenueBase Database · checked Sep 3, 2026
15	Hydro International Data, Insight & Analysis	Indirect evidence	Reading, United KingdomHQ checked Sep 3, 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 3, 2026
16	Wallingford Hydrosolutions	Indirect evidence	Wallingford, United KingdomHQ checked Sep 3, 2026	11-50	16 contacts →
	Indirect evidence “Wallingford HydroSolutions (WHS) is a vibrant, employee-owned company of dedicated professionals.” Source: RevenueBase Database · checked Sep 3, 2026
17	Edenvale Young Associates	Indirect evidence	Bristol, United KingdomHQ checked Sep 3, 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 3, 2026
18	Aval Consulting Group	Indirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	13 contacts →
	Indirect evidence “Key Services: Ecology, Air Quality, Flood Risk and Drainage, Transport Planning and Highways, Contaminated Land, Odour, Waste Management, Dust, Lighting Strategy, Daylight and…” Source: RevenueBase Database · checked Sep 3, 2026
19	Penny Anderson Associates LTD	Partial evidence	Buxton, United KingdomHQ checked Sep 3, 2026	11-50	13 contacts →
	Partial 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 3, 2026
20	Gondolin Land & Water LTD	Indirect evidence	United KingdomHQ checked Sep 3, 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 3, 2026
21	Caley Water	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 3, 2026	11-50	11 contacts →
	Indirect 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 3, 2026
22	FPS Environmental LTD	Indirect evidence	Nottingham, United KingdomHQ checked Sep 3, 2026	1-10	11 contacts →
	Indirect 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 3, 2026
23	Nimbus Engineering Consultants LTD	Partial evidence	London, United KingdomHQ checked Sep 3, 2026	1-10	11 contacts →
	Partial evidence “We are Consulting Engineers with a wealth of experience in Sustainable Urban Drainage systems, Flood Risk and Consequence Assessments, as well Surface Water Management Schemes.” Source: RevenueBase Database · checked Sep 3, 2026
24	Richard Allitt Associates LTD	Indirect evidence	Staplefield, United KingdomHQ checked Sep 3, 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 3, 2026
25	CPE Consultancy	Indirect evidence	Musselburgh, United KingdomHQ checked Sep 3, 2026	11-50	9 contacts →
	Indirect evidence “CPE Consultancy is an award-winning consultancy delivering tailored project management and multidisciplinary services to both public and private sector clients.” Source: RevenueBase Database · checked Sep 3, 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: hydrology consulting 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 hydrology consulting firms.
Partial evidence: Its own public description names part of hydrology consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydrology consulting 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 158 hydrology consulting firms based in the United Kingdom

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Hydrology consulting firms based in the United Kingdom at a glance

As of Sep 3, 2026

42.2%Verified-email coverage

5.0%Mobile-number coverage

6.7Average contacts per company

1-10Median size (employees)

8.9%Largest-city concentration · London

Sep 3, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

00–30

3731–60

25161–90

16190–180

0180+

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 hydrology consulting 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 “hydrology consulting 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 hydrology consulting 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 hydrology consulting 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, 449 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 3, 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 hydrology consulting 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 hydrology consulting firms are there based in the United Kingdom?

RevenueBase identified 158 hydrology consulting 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?

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

Which city has the most hydrology consulting firms?

London leads with 14 headquartered companies, followed by Shrewsbury (4) and Bristol (4).

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 449 verified decision-maker contacts tracked across these 158 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 3, 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.