Company lists · Data refreshed November 2026

Top 25 Hydrological consultants worldwide

Name: Hydrological consultants worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 9,156 companies tracked

RevenueBase identified 9,156 company matches for hydrological consultants worldwide as of November 2026 and tracks 162,800 professional contacts across them, including 58,564 with verified work emails. The United States is the largest market and Tehran the largest hub.

This list covers company matches for hydrological consultants worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026. Country and city lists for hydrological consultants follow the table.

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 RevenueBase SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

9,156Companies

162,800Contacts tracked

58,564Verified emails

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The 25 largest hydrological consultants worldwide

Ranked by team size

Top 25 of 9,156 company matches for hydrological consultants worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Tetra Tech	Exact match	Pasadena, CA, United StatesHQ recorded Nov 6, 2026	10001+	14,232 contacts →
	Exact match “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,553 contacts →
	Exact match “Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,553 contacts →
	Exact match “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Hazen And Sawyer	Exact match	New York, CO, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,306 contacts →
	Exact match “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Freese And Nichols	Exact match	Fort Worth, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,588 contacts →
	Exact match “Freese and Nichols is a professional planning, consulting and engineering firm serving clients across the United States.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	DHI	Exact match	Hørsholm, DenmarkHQ recorded Nov 6, 2026	1,001-5,000	1,544 contacts →
	Exact match “There is no substitute for water.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Antea Group Nederland	Exact match	Heerenveen, NetherlandsHQ recorded Nov 6, 2026	1,001-5,000	1,468 contacts →
	Exact match “Antea Group is het thuis van 1800 trotse ingenieurs en adviseurs.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Verdantas	Exact match	Tampa, FL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,275 contacts →
	Exact match “At Verdantas, we blend engineering and environmental science together with advanced technology and world-renowned labs to create solutions with the big picture in mind.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Moffatt & Nichol	Exact match	Long Beach, FL, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,202 contacts →
	Exact match “Moffatt & Nichol is a leading U.S-based global infrastructure advisor specializing in the planning and design of facilities that shape and serve our coastlines, harbors and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	DGE Danmark	Exact match	Højbjerg, DenmarkHQ recorded Nov 6, 2026	n/a	1,192 contacts →
	Exact match “Miljø er vores kernekompetence og vores ansvar.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Barr Engineering CO	Exact match	Minneapolis, NV, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,146 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Deltares	Exact match	Delft, NetherlandsHQ recorded Nov 6, 2026	501-1,000	1,091 contacts →
	Exact match “Deltares is an independent knowledge institute for applied research in the field of water and subsurface.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	WSP Chile Y Argentina	Exact match	Vitacura, ChileHQ recorded Nov 6, 2026	10001+	1,079 contacts →
	Exact match “WSP en una empresa líder en servicios profesionales de consultoría en recursos hídricos, ingeniería, medio ambiente y sustentabilidad.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Tonkin Taylor	Exact match	Auckland Central, New ZealandHQ recorded Nov 6, 2026	1,001-5,000	962 contacts →
	Exact match “At Tonkin + Taylor, we’re dedicated to creating and sustaining a better world together.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Parametrix	Exact match	Seattle, WA, United StatesHQ recorded Nov 6, 2026	501-1,000	923 contacts →
	Exact match “At Parametrix, we help our clients imagine what's possible.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Binnies	Exact match	Redhill, United KingdomHQ recorded Nov 6, 2026	501-1,000	916 contacts →
	Exact match “Together with our strategic partners, we can address everything from supporting vulnerable customers, water quality, asset performance and leak detection, to integrated planning…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Klohn Crippen Berger	Exact match	Vancouver, NB, CanadaHQ recorded Nov 6, 2026	501-1,000	909 contacts →
	Exact match “KCB is a global engineering, geosciences, and environmental consulting firm driven by Passion, Integrity and a commitment to Excellence.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	ATC Group Services LLC	Exact match	Lafayette, MA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	876 contacts →
	Exact match “ATC Group Services LLC is now Atlas.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	DUDEK	Exact match	Encinitas, CA, United StatesHQ recorded Nov 6, 2026	501-1,000	829 contacts →
	Exact match “Dudek is an environmental, planning, and engineering consulting firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Antea Group - France	Exact match	Olivet, FranceHQ recorded Nov 6, 2026	1,001-5,000	824 contacts →
	Exact match “Antea Group est une société internationale d’ingénierie et de conseil en environnement.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Integral S.A. Ingenieros Consultores	Exact match	Medellín \| Bogotá \| Lima \| Miami \| Nueva Delhi, ColombiaHQ recorded Nov 6, 2026	1,001-5,000	809 contacts →
	Exact match “Over six decades offering our consultancy services locally and internationally, based on ethical principles and commitments, always through honest, socially responsible actions…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Environmental Science Associates	Exact match	San Francisco, OR, United StatesHQ recorded Nov 6, 2026	501-1,000	748 contacts →
	Exact match “ESA is a 100% employee-owned environmental consulting firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	KBR Granherne	Exact match	Leatherhead, United KingdomHQ recorded Nov 6, 2026	501-1,000	717 contacts →
	Exact match “KBR Consulting is one of the world's foremost engineering consultancies specializing in the hydrocarbon and energy industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Sondotécnica Engenharia	Exact match	Rio De Janeiro, BrazilHQ recorded Nov 6, 2026	201-500	696 contacts →
	Exact match “Sondotécnica was founded in 1954.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Marin Maritime Research Institute Netherlands	Exact match	Wageningen, NetherlandsHQ recorded Nov 6, 2026	201-500	600 contacts →
	Exact match “MARIN is a globally recognised top institute for hydrodynamic and nautical research.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “hydrological consultants”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 9,156 hydrological consultants worldwide

See the full list, filter by size, metro and specialty, and access 58,564 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Hydrological consultants worldwide at a glance

As of Nov 6, 2026

36.0%Verified-email coverage

17.8Average contacts per company

1-10Median size (employees)

0.6%Largest-city concentration · Tehran

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

5,325

11-50

2,686

51-200

755

201-500

179

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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.
Coverage: Every country. Country and city lists for hydrological consultants are linked below.
What qualifies: Company records worldwide whose business descriptions match “hydrological consultants” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 58,564 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Hydrological consultants by location

46 lists · largest first

Every Hydrological consultants list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “hydrological consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many hydrological consultants are there worldwide?

RevenueBase identified 9,156 company matches for hydrological consultants worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Tetra Tech tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most hydrological consultants?

The United States leads with 1,445 companies, followed by Australia (609) and the United Kingdom (596). Every hydrological consultants list by country and city is linked on this page.

Which city has the most hydrological consultants?

Tehran leads with 58 company records, followed by Belo Horizonte (57) and London (56).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 58,564 professional contacts with verified work emails tracked across these 9,156 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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.