Company lists · Data refreshed September 2026

Top 25 Hydrogeology consultants worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 14,358 companies tracked

RevenueBase identified 14,358 company matches for hydrogeology consultants worldwide as of September 2026 and tracks 232,743 professional contacts across them, including 84,181 with verified work emails. The United States is the largest market and Belo Horizonte the largest hub.

This list covers company matches for hydrogeology 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 September 20, 2026. Country and city lists for hydrogeology 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 Sep 20, 2026 How this list was built

14,358Companies

232,743Contacts tracked

84,181Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest hydrogeology consultants worldwide

Ranked by team size

Top 25 of 14,358 company matches for hydrogeology consultants worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 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 20, 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 20, 2026 · View company records in RevenueBase
2	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
3	Golder	Exact match	Vancouver, BC, CanadaHQ recorded Sep 20, 2026	5,001-10,000	3,167 contacts →
	Exact match “Golder was acquired by WSP.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
5	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
6	SRK Consulting	Exact match	Vancouver, CanadaHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
7	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
8	Langan Engineering & Environmental Services	Exact match	Parsippany, NJ, United StatesHQ recorded Sep 20, 2026	1,001-5,000	2,177 contacts →
	Exact match “Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	Hazen And Sawyer	Exact match	New York, NY, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
10	GEI Consultants, INC	Exact match	Woburn, MA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,604 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	Freese And Nichols	Exact match	Fort Worth, TX, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
12	DHI	Exact match	Hørsholm, DenmarkHQ recorded Sep 20, 2026	1,001-5,000	1,427 contacts →
	Exact match “There is no substitute for water.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
14	DGE Danmark	Exact match	Højbjerg, DenmarkHQ recorded Sep 20, 2026	n/a	1,176 contacts →
	Exact match “Miljø er vores kernekompetence og vores ansvar.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Apex Companies	Exact match	Rockville, MD, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,137 contacts →
	Exact match “Who is Apex?” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
17	Deltares	Exact match	Delft, NetherlandsHQ recorded Sep 20, 2026	501-1,000	1,021 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 · Sep 20, 2026 · View company records in RevenueBase
18	WSP EN Chile	Exact match	Vitacura, ChileHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
19	Tonkin Taylor	Exact match	Auckland Central, New ZealandHQ recorded Sep 20, 2026	1,001-5,000	958 contacts →
	Exact match “At Tonkin + Taylor, we’re dedicated to creating and sustaining a better world together.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	M. N. Dastur & Co. P LTD	Exact match	Kolkata, IndiaHQ recorded Sep 20, 2026	1,001-5,000	894 contacts →
	Exact match “M.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	GZA Geoenvironmental, INC	Exact match	Norwood, MA, United StatesHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
22	Klohn Crippen Berger	Exact match	Vancouver, BC, CanadaHQ recorded Sep 20, 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 20, 2026 · View company records in RevenueBase
23	ATC Group Services LLC	Exact match	Lafayette, LA, United StatesHQ recorded Sep 20, 2026	1,001-5,000	865 contacts →
	Exact match “ATC Group Services LLC is now Atlas.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	Binnies	Exact match	Redhill, United KingdomHQ recorded Sep 20, 2026	501-1,000	842 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 · Sep 20, 2026 · View company records in RevenueBase
25	BGC Engineering INC	Exact match	Vancouver, BC, CanadaHQ recorded Sep 20, 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 20, 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 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 14,358 hydrogeology consultants worldwide

See the full list, filter by size, metro and specialty, and access 84,181 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Hydrogeology consultants worldwide at a glance

As of Sep 20, 2026

36.2%Verified-email coverage

16.2Average contacts per company

1-10Median size (employees)

1.0%Largest-city concentration · Belo Horizonte

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

7,990

11-50

4,506

51-200

1,348

201-500

289

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 consultants are linked below.
What qualifies: Company records worldwide whose business descriptions match “hydrogeology 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 84,181 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 20, 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 consultants by location

53 lists · largest first

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

How many hydrogeology consultants are there worldwide?

RevenueBase identified 14,358 company matches for hydrogeology consultants 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 consultants?

The United States leads with 2,906 companies, followed by Brazil (952) and Australia (888). Every hydrogeology consultants list by country and city is linked on this page.

Which city has the most hydrogeology consultants?

Belo Horizonte leads with 147 company records, followed by Houston (123) and Calgary (114).

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 84,181 professional contacts with verified work emails tracked across these 14,358 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 20, 2026.

Ready to reach these companies? Verified emails and direct dials for all 14,358 hydrogeology consultants worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.