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, how directly it supports the match, 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 SmartSearch, 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 Match evidence 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. Evidence rates how directly each company's own description names hydrology consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Mrag LTDIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	100
	“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: company website · checked Sep 3, 2026
2	Waterco DatrysIndirect evidence	Ruthin, United KingdomHQ checked Sep 3, 2026	11-50	59
	“Waterco Datrys is a leading consultancy in water and environmental engineering, formed through the merger of Waterco and Datrys in 2024.” Source: company website · checked Sep 3, 2026
3	Cbec Eco-Engineering UK & EuropeIndirect evidence	Inverness, United KingdomHQ checked Sep 3, 2026	11-50	37
	“CBEC eco-engineering is a leading UK environmental consultant specialising in the provision of eco-engineering solutions for the aquatic environment.” Source: company website · checked Sep 3, 2026
4	OIL Plus LTDIndirect evidence	Newbury, United KingdomHQ checked Sep 3, 2026	11-50	36
	“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: company website · checked Sep 3, 2026
5	Storm Geomatics LimitedIndirect evidence	Shipston On Stour, United KingdomHQ checked Sep 3, 2026	11-50	32
	“Measurement experts who use innovation to understand river functions and provide knowledge to inform projects that reduce flooding and improve natural habitats.” Source: company website · checked Sep 3, 2026
6	RAB ConsultantsIndirect evidence	Lichfield, United KingdomHQ checked Sep 3, 2026	11-50	29
	“RAB are dedicated to increasing resilience and reducing flood risk.” Source: company website · checked Sep 3, 2026
7	Aegaea LimitedIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	28
	“Aegaea provides expertise in water, civils and environment including discharge of conditions for outline and full planning.” Source: company website · checked Sep 3, 2026
8	Irrigation Engineers LTDIndirect evidence	High Wycombe, United KingdomHQ checked Sep 3, 2026	1-10	28
	“Irrigation Engineers Ltd is a consultancy with international experience having worked throughout Europe, Africa, the Middle East and Asia.” Source: company website · checked Sep 3, 2026
9	Mccloy Consulting LimitedPartial evidence	Newtownabbey, United KingdomHQ checked Sep 3, 2026	11-50	26
	“McCloy Consulting Limited, a specialist water focussed multidisciplinary with expertise in nature-based solutions, flood risk, geo-environmental, landscape design, ecology…” Source: company website · checked Sep 3, 2026
10	Gavia Environmental LTDPartial evidence	Perth, United KingdomHQ checked Sep 3, 2026	11-50	24
	“Gavia Environmental Ltd is a specialist environmental consultancy based in Perthshire, Scotland, providing ecological and hydrological services.” Source: company website · checked Sep 3, 2026
11	Envireau WaterIndirect evidence	Melbourne, United KingdomHQ checked Sep 3, 2026	11-50	21
	“Envireau Water is one of the UK's leading independent consultancies specialising in water management and environmental regulation.” Source: company website · checked Sep 3, 2026
12	EASIndirect evidence	Stanstead Abbotts, United KingdomHQ checked Sep 3, 2026	11-50	21
	“EAS provides expert advice on transport, flood-risk and infrastructure planning for new development.” Source: company website · checked Sep 3, 2026
13	MCL ConsultingPartial evidence	Belfast, United KingdomHQ checked Sep 3, 2026	11-50	18
	“Office Locations Belfast Based Consultancy Firm About Us MCL Consulting always operate as a team.” Source: company website · checked Sep 3, 2026
14	Water Environment LimitedPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	17
	“Water Environment Limited provides technical consulting services, specific to the water and environmental sectors of engineering.” Source: company website · checked Sep 3, 2026
15	Hydro International Data, Insight & AnalysisIndirect evidence	Reading, United KingdomHQ checked Sep 3, 2026	201-500	16
	“Hydro International, a CRH Company, provides advanced products, services and expertise to help municipal, industrial and construction customers to improve their water management…” Source: company website · checked Sep 3, 2026
16	Wallingford HydrosolutionsIndirect evidence	Wallingford, United KingdomHQ checked Sep 3, 2026	11-50	16
	“Wallingford HydroSolutions (WHS) is a vibrant, employee-owned company of dedicated professionals.” Source: company website · checked Sep 3, 2026
17	Edenvale Young AssociatesIndirect evidence	Bristol, United KingdomHQ checked Sep 3, 2026	11-50	15
	“Edenvale Young is a Civil Engineering and Scientific Consultancy specialising in the fluvial, coastal and maritime environment.” Source: company website · checked Sep 3, 2026
18	Aval Consulting GroupIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	13
	“Key Services: Ecology, Air Quality, Flood Risk and Drainage, Transport Planning and Highways, Contaminated Land, Odour, Waste Management, Dust, Lighting Strategy, Daylight and…” Source: company website · checked Sep 3, 2026
19	Penny Anderson Associates LTDPartial evidence	Buxton, United KingdomHQ checked Sep 3, 2026	11-50	13
	“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: company website · checked Sep 3, 2026
20	Gondolin Land & Water LTDIndirect evidence	United KingdomHQ checked Sep 3, 2026	11-50	12
	“Gondolin Land & Water Ltd is a growing Environmental and Civil Engineering Consultancy business based in Scotland with coverage throughout England, Scotland and Ireland.” Source: company website · checked Sep 3, 2026
21	Caley WaterIndirect evidence	Edinburgh, United KingdomHQ checked Sep 3, 2026	11-50	11
	“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: company website · checked Sep 3, 2026
22	FPS Environmental LTDIndirect evidence	Nottingham, United KingdomHQ checked Sep 3, 2026	1-10	11
	“As part of The FPS Group, FPS Environmental Ltd delivers engineering excellence within the flood, water, and environmental sectors.” Source: company website · checked Sep 3, 2026
23	Nimbus Engineering Consultants LTDPartial evidence	London, United KingdomHQ checked Sep 3, 2026	1-10	11
	“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: company website · checked Sep 3, 2026
24	Richard Allitt Associates LTDIndirect evidence	Staplefield, United KingdomHQ checked Sep 3, 2026	11-50	10
	“Richard Allitt Associates is a leading provider of hydraulic engineering and flood risk consultancy for the urban drainage industry.” Source: company website · checked Sep 3, 2026
25	CPE ConsultancyIndirect evidence	Musselburgh, United KingdomHQ checked Sep 3, 2026	11-50	9
	“CPE Consultancy is an award-winning consultancy delivering tailored project management and multidisciplinary services to both public and private sector clients.” Source: company website · checked Sep 3, 2026

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

1-10Median size (employees)

LondonLargest hub · 14 HQs

53Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Verified emails by last verification

0–30

31–60

61–90

251

90–180

161

180+

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 evidence 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 SmartSearch, 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.
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 an evidence 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

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 SmartSearch, 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.