Company lists · Data refreshed September 2026

Top 25 Hydrogeology companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 15,490 companies tracked

RevenueBase identified 15,490 company matches for hydrogeology companies worldwide as of September 2026 and tracks 297,864 professional contacts across them, including 89,698 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers company matches for hydrogeology companies 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 hydrogeology companies 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

15,490Companies

297,864Contacts tracked

89,698Verified emails

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The 25 largest hydrogeology companies worldwide

Ranked by team size

Top 25 of 15,490 company matches for hydrogeology companies 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	Halliburton	Exact match	Houston, TX, United StatesHQ recorded Sep 21, 2026	10001+	53,380 contacts →
	Exact match “We collaborate and engineer solutions to maximize asset value for our customers.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	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
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	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
5	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
6	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
7	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
8	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
9	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
10	Select Water Solutions	Exact match	Gainesville, TX, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,605 contacts →
	Exact match “Select is a leader in water management and chemical technology to our customers in the oil and gas industry, as well as in other industrial applications.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Major Drilling	Exact match	Moncton, NB, CanadaHQ recorded Sep 21, 2026	1,001-5,000	1,447 contacts →
	Exact match “Major Drilling Group International Inc.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	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
13	Geosol Geologia E Sondagens S.A	Exact match	Belo Horizonte, BrazilHQ recorded Sep 21, 2026	1,001-5,000	1,317 contacts →
	Exact match “One of the leading geology companies in the world, GEOSOL excels in the undertaking of geological drilling and mineral engineering programs.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Newpark	Exact match	Katy, TX, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,244 contacts →
	Exact match “Newpark Fluids Systems is the world’s leading pure-play oil & gas and geothermal fluid solutions provider.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
16	BGP International	Exact match	涿州, ChinaHQ recorded Sep 21, 2026	5,001-10,000	1,097 contacts →
	Exact match “BGP is one of the world's competitive geophysical companies, delivering a wide range of geophysical products and services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Woodard & Curran	Exact match	Portland, ME, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,060 contacts →
	Exact match “Woodard & Curran is more than just a consulting firm – we are an employee-owned integrated science, engineering, design-build, and operations company specializing in water and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Deltares	Exact match	Delft, NetherlandsHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
19	Carso Perforación	Exact match	United StatesHQ recorded Sep 21, 2026	1,001-5,000	994 contacts →
	Exact match “Empresa líder en el Sector Petrolero, con presencia a Nivel Nacional, principales clientes PEMEX Y CFE, con servicios como perforación de pozos terrestres, Marinos, Geotérmicos…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	WSP EN Chile	Exact match	Vitacura, ChileHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
21	Aquatech	Exact match	Canonsburg, PA, United StatesHQ recorded Sep 21, 2026	501-1,000	903 contacts →
	Exact match “Aquatech enables the world's most recognized companies to solve complex challenges in water reuse, desalination, minimal and zero liquid discharge, and critical minerals…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	GZA Geoenvironmental, INC	Exact match	Norwood, MA, United StatesHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
23	Klohn Crippen Berger	Exact match	Vancouver, BC, CanadaHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
24	BGC Engineering INC	Exact match	Vancouver, BC, CanadaHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
25	AGR	Exact match	Oslo, NorwayHQ recorded Sep 21, 2026	501-1,000	768 contacts →
	Exact match “AGR – an Aqualis company – is a multidisciplinary consultancy, specialising in drilling & wells, subsurface, marine and subsea solutions, resourcing, technical safety and software…” 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 “hydrogeology companies”. 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 15,490 hydrogeology companies worldwide

See the full list, filter by size, metro and specialty, and access 89,698 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Hydrogeology companies worldwide at a glance

As of Sep 21, 2026

30.1%Verified-email coverage

19.2Average contacts per company

1-10Median size (employees)

1.2%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

7,987

11-50

5,067

51-200

1,686

201-500

429

501-1,000

113

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 companies are linked below.
What qualifies: Company records worldwide whose business descriptions match “hydrogeology companies” 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 89,698 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.

Hydrogeology companies by location

57 lists · largest first

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

How many hydrogeology companies are there worldwide?

RevenueBase identified 15,490 company matches for hydrogeology companies 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?

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

Which country has the most hydrogeology companies?

The United States leads with 3,115 companies, followed by Brazil (1,072) and Canada (803). Every hydrogeology companies list by country and city is linked on this page.

Which city has the most hydrogeology companies?

Houston leads with 192 company records, followed by Calgary (162) and Belo Horizonte (139).

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 89,698 professional contacts with verified work emails tracked across these 15,490 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.

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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.