Company lists · Data refreshed November 2026

Top 25 Subsurface characterization firms based in the United States

Name: Subsurface characterization firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 489 companies tracked

RevenueBase identified 489 company matches for subsurface characterization firms associated with the United States as of November 2026 and tracks 6,645 professional contacts across them, including 2,333 with verified work emails. Houston is the largest hub.

This list covers company matches for subsurface characterization firms associated with the United States, 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 November 6, 2026.

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 Nov 6, 2026 How this list was built

489Companies

6,645Contacts tracked

2,333Verified emails

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The 25 largest subsurface characterization firms based in the United States

Ranked by team size

Top 25 of 489 company matches for subsurface characterization firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	Global Geophysical Services	Exact match	Missouri City, TX, United StatesHQ recorded Nov 6, 2026	201-500	508 contacts →
	Exact match “GGS provides an integrated suite of Geoscience solutions to the global oil and gas industry including high-resolution RG-3D Reservoir Grade® seismic data acquisition, Multi Client…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Cascade Environmental, LLC	Exact match	Bothell, WA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	262 contacts →
	Exact match “CASCADE is the leading provider of environmental and geotechnical drilling, site investigation and environmental remediation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Converse Consultants	Exact match	Monrovia, CA, United StatesHQ recorded Nov 6, 2026	51-200	139 contacts →
	Exact match “Converse was established in 1946 by Professor Frederick J.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Geopoint	Exact match	Tampa, FL, United StatesHQ recorded Nov 6, 2026	201-500	123 contacts →
	Exact match “One of the largest privately owned land surveying companies in Florida, GeoPoint provides standard-setting services including subsurface utility location, 811 locating…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Geotechnology, LLC	Exact match	St. Louis, AR, United StatesHQ recorded Nov 6, 2026	201-500	120 contacts →
	Exact match “Geotechnology, LLC provides geotechnical engineering, environmental sciences, geophysics, construction materials testing, non-destructive testing, water resource management and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Geosoftware	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	51-200	117 contacts →
	Exact match “GeoSoftware is the global trusted partner for subsurface geoscience software and consulting services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Benthic - Utec	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	51-200	114 contacts →
	Exact match “Benthic is a global leader in offshore marine geotechnical investigation, survey, analysis and design.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Pro-Vac, LLC	Exact match	Puyallup, WA, United StatesHQ recorded Nov 6, 2026	51-200	97 contacts →
	Exact match “We deliver safe, efficient, and innovative subsurface solutions to support the maintenance and construction of our communities’ critical infrastructure through our expansive fleet…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Brierley Associates Corporation	Exact match	Englewood, IL, United StatesHQ recorded Nov 6, 2026	51-200	93 contacts →
	Exact match “Creating Space Underground®” has been our mission and our passion for 25 years.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Crux Subsurface, INC	Exact match	Spokane Valley, WA, United StatesHQ recorded Nov 6, 2026	51-200	93 contacts →
	Exact match “An integrated geo-structural firm working collaboratively to obtain reliable subsurface data and create efficient, constructible foundation designs.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	Datalog	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	51-200	89 contacts →
	Exact match “Anyone can provide data.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Microseismic, INC	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	51-200	83 contacts →
	Exact match “Specialist in Real-Time Completions Intelligence for Fracture Geometry & Efficiency \| Geohazards \| Stress Field \| CCUS \| Geothermal \| FDI \| Sinkhole Detection \| Induced Seismicity…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Ettl Engineers And Consultants INC	Exact match	Tyler, TX, United StatesHQ recorded Nov 6, 2026	51-200	82 contacts →
	Exact match “ETTL Engineers & Consultants Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Shaft Drillers International	Exact match	Mt Morris, PA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	78 contacts →
	Exact match “Shaft Drillers International LLC Headquartered in Mt.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Lumina Geophysical	Exact match	Houston, TX, United StatesHQ recorded Nov 6, 2026	51-200	78 contacts →
	Exact match “Lumina is a leading geophysical services solutions and software provider, specializing in innovative tools for subsurface data analysis in the energy industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Trinity Subsurface, LLC	Exact match	Wilmington, DE, United StatesHQ recorded Nov 6, 2026	51-200	75 contacts →
	Exact match “We want to be the first people you call when you need information or have a problem below the surface.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Summit Drilling	Exact match	Bridgewater, NJ, United StatesHQ recorded Nov 6, 2026	51-200	74 contacts →
	Exact match “Summit is a trusted leader in environmental industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Collier Consulting & Collier Geophysics	Exact match	Stephenville, MA, United StatesHQ recorded Nov 6, 2026	51-200	73 contacts →
	Exact match “Geoscience • Engineering • Geophysics Collier Consulting, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Zonge International	Exact match	Reno, NV, United StatesHQ recorded Nov 6, 2026	51-200	70 contacts →
	Exact match “Minerals / Geothermal / Groundwater / Petroleum / Environmental / Infrastructure Are you concerned about ensuring every opportunity for success for your project and stakeholders?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Rangefront Mining Services	Exact match	Elko, NV, United StatesHQ recorded Nov 6, 2026	51-200	70 contacts →
	Exact match “Rangefront exists to serve your mining or exploration project in the most efficient, advanced, and forward-thinking way.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Paragon Geophysical Services, INC	Exact match	Wichita, KS, United StatesHQ recorded Nov 6, 2026	51-200	68 contacts →
	Exact match “Headquartered in Wichita, Kansas, and founded in 1993, Paragon Geophysical Services, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Giles Engineering Associates, INC	Exact match	Waukesha, WI, United StatesHQ recorded Nov 6, 2026	51-200	67 contacts →
	Exact match “Giles Engineering Associates, Inc.(Giles) is a national consulting engineering firm specializing in geotechnical (soils), environmental, subsurface exploration (drilling), and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Impac Exploration Services	Exact match	Weatherford, OK, United StatesHQ recorded Nov 6, 2026	51-200	66 contacts →
	Exact match “Impac Exploration Services, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Call & Nicholas	Exact match	Tucson, AZ, United StatesHQ recorded Nov 6, 2026	51-200	60 contacts →
	Exact match “CALL & NICHOLAS (CNI) is an international mining consulting firm that specializes in geological engineering, geotechnical engineering, and hydrogeology.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Geometrics INC	Exact match	San Jose, CA, United StatesHQ recorded Nov 6, 2026	51-200	58 contacts →
	Exact match “Empowering geoscientists everywhere to explore and quantify the world since 1969.” Recorded in the RevenueBase company graph · Nov 6, 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 characterization 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 489 subsurface characterization firms based in the United States

See the full list, filter by size, metro and specialty, and access 2,333 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Subsurface characterization firms based in the United States at a glance

As of Nov 6, 2026

35.1%Verified-email coverage

13.6Average contacts per company

1-10Median size (employees)

14.9%Largest-city concentration · Houston

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

267

11-50

152

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 489 companies.

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.
What qualifies: Company records associated with the United States whose business descriptions match “subsurface characterization 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 2,333 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 November 6, 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 characterization firms by metro

Subsurface characterization firms in Houston73

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 characterization firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many subsurface characterization firms are there based in the United States?

RevenueBase identified 489 company matches for subsurface characterization firms associated with the United States as of November 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?

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

Which city has the most subsurface characterization firms?

Houston leads with 73 company records, followed by Denver (9) and Reno (9).

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 2,333 professional contacts with verified work emails tracked across these 489 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 November 6, 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.