Company lists · Data refreshed September 2026

Top 25 Hydrogeological consultants worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 31,025 companies tracked

RevenueBase identified 31,025 company matches for hydrogeological consultants worldwide as of September 2026 and tracks 524,983 professional contacts across them, including 168,586 with verified work emails. The United States is the largest market and Belo Horizonte the largest hub.

This list covers company matches for hydrogeological 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 21, 2026. Country and city lists for hydrogeological 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 21, 2026 How this list was built

31,025Companies

524,983Contacts tracked

168,586Verified emails

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

The 25 largest hydrogeological consultants worldwide

Ranked by team size

Top 25 of 31,025 company matches for hydrogeological consultants worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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 21, 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 21, 2026 · View company records in RevenueBase
2	Tata Consulting Engineers	Exact match	Mumbai, IndiaHQ recorded Sep 21, 2026	5,001-10,000	8,440 contacts →
	Exact match “Tata Consulting Engineers Limited (TCE) is the largest Indian private sector engineering and project consultancy and an emerging global leader in integrated engineering solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
4	Keller	Exact match	London, United KingdomHQ recorded Sep 21, 2026	5,001-10,000	3,960 contacts →
	Exact match “Every day, people around the world live, work and play on ground prepared by Keller, the world's largest geotechnical specialist contractor.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Golder	Exact match	Vancouver, BC, CanadaHQ recorded Sep 21, 2026	5,001-10,000	3,167 contacts →
	Exact match “Golder was acquired by WSP.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	NIRAS	Exact match	Allerød, DenmarkHQ recorded Sep 21, 2026	1,001-5,000	2,699 contacts →
	Exact match “At NIRAS, we engineer solutions for a shared future.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Brown And Caldwell	Exact match	Walnut Creek, CA, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
8	Geosyntec Consultants	Exact match	Boca Raton, FL, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
9	SRK Consulting	Exact match	Vancouver, CanadaHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
10	Providence	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 21, 2026	n/a	2,232 contacts →
	Exact match “Providence is an employee-owned engineering and environmental consulting firm.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
12	DRA Global	Exact match	Johannesburg, South AfricaHQ recorded Sep 21, 2026	1,001-5,000	2,180 contacts →
	Exact match “DRA Global Limited (DRA or the Group) is an international multi-disciplinary engineering, project delivery and operations management group, predominantly focused on the mining…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Langan Engineering & Environmental Services	Exact match	Parsippany, NJ, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
14	Civil & Environmental Consultants, INC	Exact match	Moon Township, PA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	2,145 contacts →
	Exact match “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Hazen And Sawyer	Exact match	New York, NY, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
16	Englobe	Exact match	Québec, QC, CanadaHQ recorded Sep 21, 2026	1,001-5,000	1,852 contacts →
	Exact match “Englobe is a leader in the fields of engineering, gesosciences, environmental management, asset integrity and quality management.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Burns & Mcdonnell India	Exact match	Vikhroli West, IndiaHQ recorded Sep 21, 2026	1,001-5,000	1,724 contacts →
	Exact match “At Burns & McDonnell India, we are a diverse team of talented engineers with multidiscipline design and consultancy working across sectors in critical infrastructure: oil and gas…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Carollo Engineers	Exact match	Walnut Creek, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,718 contacts →
	Exact match “For more than 90 years, Carollo Engineers has been dedicated exclusively to water and wastewater solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	GEI Consultants, INC	Exact match	Woburn, MA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,604 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	UES	Exact match	Orlando, FL, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,595 contacts →
	Exact match “UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Exponent	Exact match	Menlo Park, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,560 contacts →
	Exact match “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	Freese And Nichols	Exact match	Fort Worth, TX, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
23	DHI	Exact match	Hørsholm, DenmarkHQ recorded Sep 21, 2026	1,001-5,000	1,427 contacts →
	Exact match “There is no substitute for water.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Antea Group Nederland	Exact match	Heerenveen, NetherlandsHQ recorded Sep 21, 2026	1,001-5,000	1,397 contacts →
	Exact match “Antea Group is het thuis van 1800 trotse ingenieurs en adviseurs.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Ingetec	Exact match	Bogota, ColombiaHQ recorded Sep 21, 2026	1,001-5,000	1,358 contacts →
	Exact match “Ingetec está conformado por un grupo de profesionales con alto nivel de especialización, quienes trabajan dentro de las diferentes gerencias y divisiones que componen la…” Recorded in the RevenueBase company graph · Sep 21, 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 “hydrogeological 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 31,025 hydrogeological consultants worldwide

See the full list, filter by size, metro and specialty, and access 168,586 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Hydrogeological consultants worldwide at a glance

As of Sep 21, 2026

32.1%Verified-email coverage

16.9Average contacts per company

1-10Median size (employees)

0.8%Largest-city concentration · Belo Horizonte

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

16,560

11-50

9,917

51-200

3,194

201-500

755

501-1,000

229

1,001-5,000

173

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 hydrogeological consultants are linked below.
What qualifies: Company records worldwide whose business descriptions match “hydrogeological 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 168,586 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 21, 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.

Hydrogeological consultants by location

103 lists · largest first

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

How many hydrogeological consultants are there worldwide?

RevenueBase identified 31,025 company matches for hydrogeological 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 hydrogeological consultants?

The United States leads with 4,224 companies, followed by Brazil (2,238) and Australia (2,059). Every hydrogeological consultants list by country and city is linked on this page.

Which city has the most hydrogeological consultants?

Belo Horizonte leads with 258 company records, followed by Sao Paulo (254) and Perth (206).

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 168,586 professional contacts with verified work emails tracked across these 31,025 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 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 31,025 hydrogeological 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.