Company lists · Data refreshed September 2026

Top 25 Subsurface technical consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 8,365 companies tracked

RevenueBase identified 8,365 company matches for subsurface technical consulting firms worldwide as of September 2026 and tracks 127,114 professional contacts across them, including 38,734 with verified work emails. The United States is the largest market and Belo Horizonte the largest hub.

This list covers company matches for subsurface technical 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 29, 2026. Country and city lists for subsurface technical 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 29, 2026 How this list was built

8,365Companies

127,114Contacts tracked

38,734Verified emails

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The 25 largest subsurface technical consulting firms worldwide

Ranked by team size

Top 25 of 8,365 company matches for subsurface technical consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 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	Terracon	Exact match	Olathe, KS, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
2	Keller	Exact match	London, United KingdomHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
3	SRK Consulting	Exact match	Vancouver, CanadaHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
4	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
5	Major Drilling	Exact match	Moncton, NB, CanadaHQ recorded Sep 29, 2026	1,001-5,000	1,447 contacts →
	Exact match “Major Drilling Group International Inc.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
7	Capital Limited	Exact match	Mauritius, AustriaHQ recorded Sep 29, 2026	1,001-5,000	994 contacts →
	Exact match “Capital Limited is a leading service provider for the exploration and mining industry.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	GZA Geoenvironmental, INC	Exact match	Norwood, MA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
9	Klohn Crippen Berger	Exact match	Vancouver, BC, CanadaHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
10	BGC Engineering INC	Exact match	Vancouver, BC, CanadaHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
11	AGR	Exact match	Oslo, NorwayHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
12	Integral S.A. Ingenieros Consultores	Exact match	Medellín \| Bogotá \| Lima \| Miami \| Nueva Delhi, ColombiaHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
13	Seequent	Exact match	Christchurch, New ZealandHQ recorded Sep 29, 2026	501-1,000	696 contacts →
	Exact match “Seequent, The Bentley Subsurface Company, helps organisations to understand the underground, giving them the confidence to make better decisions faster.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	Raba Kistner, INC	Exact match	San Antonio, TX, United StatesHQ recorded Sep 29, 2026	501-1,000	582 contacts →
	Exact match “Founded in 1968, Raba Kistner Inc.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	Nova Engineering And Environmental, LLC	Exact match	Kennesaw, GA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
16	Geotec	Exact match	Ate, BelgiumHQ recorded Sep 29, 2026	1,001-5,000	504 contacts →
	Exact match “Geotec S.A, empresa de perforación perteneciente a Boyles Bros, fue fundado en 1963 posicionándose como una empresa líder en la industria minera peruana.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17	Entact, LLC	Exact match	Westmont, IL, United StatesHQ recorded Sep 29, 2026	501-1,000	483 contacts →
	Exact match “ENTACT is the partner of choice in solving our customer's most complex environmental remediation and geotechnical infrastructure challenges.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
18	Thurber Engineering LTD	Exact match	Edmonton, AB, CanadaHQ recorded Sep 29, 2026	501-1,000	480 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	Geoengineers INC	Exact match	Redmond, WA, United StatesHQ recorded Sep 29, 2026	201-500	479 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
20	ERG Engenharia	Exact match	Belo Horizonte, BrazilHQ recorded Sep 29, 2026	201-500	477 contacts →
	Exact match “Empresa mineira, fundada em 1988, a ERG Engenharia mantém vivo o seu ideal de participar da construção de um mundo melhor e sustentável.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	GEO	Exact match	Kgs. Lyngby (copenhagen), DenmarkHQ recorded Sep 29, 2026	201-500	468 contacts →
	Exact match “Founded in 1943, Geo is a market leading engineering consultancy company and contractor, specialised within the fields of geotechnical and environmental engineering (geoteknik og…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Douglas Partners	Exact match	West Ryde, AustraliaHQ recorded Sep 29, 2026	501-1,000	466 contacts →
	Exact match “Welcome to Douglas Partners Pty Ltd, a leading engineering consultancy specialising in geotechnics, rock mechanics, environment, groundwater, earthworks and geophysics.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	Anddes	Exact match	Santiago De Surco, PeruHQ recorded Sep 29, 2026	201-500	462 contacts →
	Exact match “En Anddes nos especializamos en brindar servicios de asesoría y consultoría para el desarrollo y supervisión de proyectos ambientales, electromecánicos, civiles y de construcción…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24	Geo-Technology Associates, Inc. GTA	Exact match	Abingdon, MD, United KingdomHQ recorded Sep 29, 2026	501-1,000	460 contacts →
	Exact match “Geo-Technology Associates, Inc.(GTA) proudly celebrates more than 40 years of service, backed by a team of 600+ professionals-including geotechnical engineers, environmental…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25	AKD International	Exact match	PanamaHQ recorded Sep 29, 2026	201-500	452 contacts →
	Exact match “AKD® International es el Aliado Estratégico de toda Empresa de Minería, Energía y/o Petróleo en Latinoamérica que busca un Experto en Perforación con Gran Amor por lo que hace y…” Recorded in the RevenueBase company graph · Sep 29, 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 “subsurface technical 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 8,365 subsurface technical consulting firms worldwide

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Subsurface technical consulting firms worldwide at a glance

As of Sep 29, 2026

30.5%Verified-email coverage

15.2Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · Belo Horizonte

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

4,486

11-50

2,685

51-200

868

201-500

195

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 subsurface technical consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “subsurface technical 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 38,734 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 29, 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.

Subsurface technical consulting firms by location

46 lists · largest first

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

How many subsurface technical consulting firms are there worldwide?

RevenueBase identified 8,365 company matches for subsurface technical 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?

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

Which country has the most subsurface technical consulting firms?

The United States leads with 1,264 companies, followed by Brazil (650) and Canada (456). Every subsurface technical consulting firms list by country and city is linked on this page.

Which city has the most subsurface technical consulting firms?

Belo Horizonte leads with 115 company records, followed by Houston (88) and Sao Paulo (81).

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 38,734 professional contacts with verified work emails tracked across these 8,365 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 29, 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.