Company lists · Data refreshed September 2026

Top 25 Hydrogeology consulting firms worldwide

Name: Hydrogeology consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 6,636 companies tracked

RevenueBase identified 6,636 company matches for hydrogeology consulting firms worldwide as of September 2026 and tracks 133,515 professional contacts across them, including 52,808 with verified work emails. The United States is the largest market and Belo Horizonte the largest hub.

This list covers company matches for hydrogeology consulting firms 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 September 28, 2026. Country and city lists for hydrogeology consulting firms 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 Sep 28, 2026 How this list was built

6,636Companies

133,515Contacts tracked

52,808Verified emails

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The 25 largest hydrogeology consulting firms worldwide

Ranked by team size

Top 25 of 6,636 company matches for hydrogeology consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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 Sep 28, 2026	10001+	12,999 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 · Sep 28, 2026 · View company records in RevenueBase
2	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Sep 28, 2026	5,001-10,000	6,113 contacts →
	Exact match “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,473 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 · Sep 28, 2026 · View company records in RevenueBase
4	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,393 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 · Sep 28, 2026 · View company records in RevenueBase
5	SRK Consulting	Exact match	Vancouver, CanadaHQ recorded Sep 28, 2026	1,001-5,000	2,259 contacts →
	Exact match “SRK Consulting is an independent, international group providing specialised consultancy services.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,210 contacts →
	Exact match “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Hazen And Sawyer	Exact match	New York, NY, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,100 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 · Sep 28, 2026 · View company records in RevenueBase
8	GEI Consultants, INC	Exact match	Woburn, MA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,604 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Freese And Nichols	Exact match	Fort Worth, TX, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,496 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 · Sep 28, 2026 · View company records in RevenueBase
10	DHI	Exact match	Hørsholm, DenmarkHQ recorded Sep 28, 2026	1,001-5,000	1,427 contacts →
	Exact match “There is no substitute for water.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,231 contacts →
	Exact match “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Apex Companies	Exact match	Rockville, MD, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,137 contacts →
	Exact match “Who is Apex?” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,088 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 · Sep 28, 2026 · View company records in RevenueBase
14	WSP EN Chile	Exact match	Vitacura, ChileHQ recorded Sep 28, 2026	10001+	988 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 · Sep 28, 2026 · View company records in RevenueBase
15	GZA Geoenvironmental, INC	Exact match	Norwood, MA, United StatesHQ recorded Sep 28, 2026	501-1,000	880 contacts →
	Exact match “Founded in 1964 as a soils and foundations specialty consultant, GZA GeoEnvironmental, Inc.(GZA) has grown into a full-service company providing its clients with highly…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Klohn Crippen Berger	Exact match	Vancouver, BC, CanadaHQ recorded Sep 28, 2026	501-1,000	871 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 · Sep 28, 2026 · View company records in RevenueBase
17	BGC Engineering INC	Exact match	Vancouver, BC, CanadaHQ recorded Sep 28, 2026	501-1,000	798 contacts →
	Exact match “BGC Engineering is an international consulting firm that provides professional services in applied earth sciences.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	DUDEK	Exact match	Encinitas, CA, United StatesHQ recorded Sep 28, 2026	501-1,000	795 contacts →
	Exact match “Dudek is an environmental, planning, and engineering consulting firm.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Integral S.A. Ingenieros Consultores	Exact match	Medellín \| Bogotá \| Lima \| Miami \| Nueva Delhi, ColombiaHQ recorded Sep 28, 2026	1,001-5,000	709 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 · Sep 28, 2026 · View company records in RevenueBase
20	Schnabel Engineering	Exact match	Glen Allen, VA, United StatesHQ recorded Sep 28, 2026	501-1,000	707 contacts →
	Exact match “Schnabel is a trusted partner in building the foundation for project success.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Sondotécnica Engenharia	Exact match	Rio De Janeiro, BrazilHQ recorded Sep 28, 2026	201-500	588 contacts →
	Exact match “Sondotécnica was founded in 1954.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Raba Kistner, INC	Exact match	San Antonio, TX, United StatesHQ recorded Sep 28, 2026	501-1,000	582 contacts →
	Exact match “Founded in 1968, Raba Kistner Inc.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Trihydro Corporation	Exact match	Laramie, WY, United StatesHQ recorded Sep 28, 2026	501-1,000	577 contacts →
	Exact match “Headquartered in Laramie, Wyoming, Trihydro provides environmental consulting, engineering and surveying, air quality and process management, information technology, and water and…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Nova Engineering And Environmental, LLC	Exact match	Kennesaw, GA, United StatesHQ recorded Sep 28, 2026	501-1,000	518 contacts →
	Exact match “Established in 1996, NOVA was originally founded to provide Environmental Consulting, Geotechnical Engineering, and Construction Materials Testing and Inspection services to the…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	Thurber Engineering LTD	Exact match	Edmonton, AB, CanadaHQ recorded Sep 28, 2026	501-1,000	480 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 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 “hydrogeology consulting firms”. 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 6,636 hydrogeology consulting firms worldwide

See the full list, filter by size, metro and specialty, and access 52,808 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Hydrogeology consulting firms worldwide at a glance

As of Sep 28, 2026

39.6%Verified-email coverage

20.1Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · Belo Horizonte

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

3,745

11-50

2,071

51-200

605

201-500

118

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 hydrogeology consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “hydrogeology consulting firms” 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 52,808 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 September 28, 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.

Hydrogeology consulting firms by location

33 lists · largest first

Every Hydrogeology consulting firms 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 “hydrogeology consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many hydrogeology consulting firms are there worldwide?

RevenueBase identified 6,636 company matches for hydrogeology consulting firms worldwide as of September 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 hydrogeology consulting firms?

The United States leads with 1,697 companies, followed by Brazil (471) and Canada (357). Every hydrogeology consulting firms list by country and city is linked on this page.

Which city has the most hydrogeology consulting firms?

Belo Horizonte leads with 92 company records, followed by Calgary (60) and Houston (51).

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 52,808 professional contacts with verified work emails tracked across these 6,636 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 September 28, 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.