Company lists · Data refreshed September 2026

Top 25 Subsurface exploration services based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 1,039 companies tracked

RevenueBase identified 1,039 subsurface exploration services headquartered in the United States as of September 2026 and tracks 17,610 professional contacts across them, including 6,897 with verified work emails. Houston is the largest hub.

This list covers subsurface exploration services headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

1,039Companies

17,610Contacts tracked

6,897Verified emails

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The 25 largest subsurface exploration services based in the United States

Ranked by team size

Top 25 of 1,039 subsurface exploration services based in the United States, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to subsurface exploration services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Saexploration	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	201-500	521 contacts →
	Indirect evidence “SAExploration offers a full range of geophysical ground acquisition services from design, prospecting, drilling, recording and analysis of field quality, as well as mobilization…” Source: RevenueBase Database · checked Sep 22, 2026
2	Ninyo & Moore, A Socotec Company	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 22, 2026	501-1,000	449 contacts →
	Indirect evidence “Ninyo & Moore was acquired by SOCOTEC US.” Source: RevenueBase Database · checked Sep 22, 2026
3	Minova	Indirect evidence	Greenwood Village, CO, United StatesHQ checked Sep 22, 2026	1,001-5,000	449 contacts →
	Indirect evidence “Minova is an industry leader of ground support and geotechnical solutions for mining, tunnelling and surface ground engineering projects.” Source: RevenueBase Database · checked Sep 22, 2026
4	Froehling & Robertson, INC	Indirect evidence	Richmond, VA, United StatesHQ checked Sep 22, 2026	201-500	312 contacts →
	Indirect evidence “Established in 1881, Froehling & Robertson, Inc.” Source: RevenueBase Database · checked Sep 22, 2026
5	Hillis-Carnes Engineering Associates, INC	Indirect evidence	Annapolis Junction, MD, United StatesHQ checked Sep 22, 2026	201-500	299 contacts →
	Indirect evidence “Hillis-Carnes Engineering Associates, Inc.(HCEA) is a Mid-Atlantic based, multi-disciplined consulting engineering firm.” Source: RevenueBase Database · checked Sep 22, 2026
6	ENGEO	Indirect evidence	San Ramon, CA, United StatesHQ checked Sep 22, 2026	201-500	282 contacts →
	Indirect evidence “ENGEO Incorporated is an award-winning, employee-owned comprehensive provider of more than 400 geotechnical and civil engineers, geologists, GIS experts, environmental scientists…” Source: RevenueBase Database · checked Sep 22, 2026
7	Degolyer And Macnaughton	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 22, 2026	201-500	268 contacts →
	Indirect evidence “Reserves assessments and appraisals • Prospective resources assessments • Unconventional resources assessments • Contingent resources assessments • Reservoir simulation •…” Source: RevenueBase Database · checked Sep 22, 2026
8	Cascade Environmental, LLC	Indirect evidence	Bothell, WA, United StatesHQ checked Sep 22, 2026	1,001-5,000	248 contacts →
	Indirect evidence “CASCADE is the leading provider of environmental and geotechnical drilling, site investigation and environmental remediation.” Source: RevenueBase Database · checked Sep 22, 2026
9	Geotek	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 22, 2026	201-500	215 contacts →
	Indirect evidence “Incorporated in 1997, GeoTek is a full service consulting engineering firm specializing in geotechnical engineering, construction materials testing, special inspection, and…” Source: RevenueBase Database · checked Sep 22, 2026
10	Geocon	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 22, 2026	201-500	197 contacts →
	Indirect evidence “Geocon is a California corporation established in 1971 as a professional engineering consulting firm providing comprehensive geotechnical engineering, geotechnical…” Source: RevenueBase Database · checked Sep 22, 2026
11	Leighton	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	51-200	190 contacts →
	Indirect evidence “Leighton, a Verdantas Company, provides environmental, geotechnical, materials testing, and special inspection services across the built community.” Source: RevenueBase Database · checked Sep 22, 2026
12	CTL Thompson	Indirect evidence	Denver, CO, United StatesHQ checked Sep 22, 2026	201-500	189 contacts →
	Indirect evidence “CTL\|Thompson (CTL\|T) has been providing innovative engineering solutions throughout Colorado since 1971.” Source: RevenueBase Database · checked Sep 22, 2026
13	Patriot Engineering And Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 22, 2026	51-200	183 contacts →
	Indirect evidence “Since its beginning in 1995, Patriot has built its reputation on serving the needs of the growing development and redevelopment community.” Source: RevenueBase Database · checked Sep 22, 2026
14	Small Mine Development, LLC	Indirect evidence	Boise, ID, United StatesHQ checked Sep 22, 2026	201-500	179 contacts →
	Indirect evidence “Small Mine Development builds and operates America’s underground mines.” Source: RevenueBase Database · checked Sep 22, 2026
15	Diversified	Indirect evidence	Reserve, LA, United StatesHQ checked Sep 22, 2026	201-500	178 contacts →
	Indirect evidence “Diversified collaborates with our business partners to lower finding and development costs, decrease the risk profile, increase reserves, and to improve capital efficiencies and…” Source: RevenueBase Database · checked Sep 22, 2026
16	United Consulting	Indirect evidence	Norcross, GA, United StatesHQ checked Sep 22, 2026	51-200	176 contacts →
	Indirect evidence “United Consulting is a multi-disciplined engineering consulting firm located in Norcross, Georgia.” Source: RevenueBase Database · checked Sep 22, 2026
17	Kumar And Associates, INC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 22, 2026	51-200	140 contacts →
	Indirect evidence “Kumar & Associates provides geotechnical engineering, engineering geology, environmental sciences, construction observation and materials testing services for projects in the…” Source: RevenueBase Database · checked Sep 22, 2026
18	CMT Technical Services	Indirect evidence	West Valley City, UT, United StatesHQ checked Sep 22, 2026	201-500	138 contacts →
	Indirect evidence “CMT Technical Services is a leading provider of Geotechnical Engineering, Materials Testing & Special Inspection, Surveying, and full-service Construction Management.” Source: RevenueBase Database · checked Sep 22, 2026
19	Geotechnical Consultants, INC	Indirect evidence	Westerville, OH, United StatesHQ checked Sep 22, 2026	51-200	133 contacts →
	Indirect evidence “Geotechnical Consultants, Inc.(GCI) is a professional geo-engineering firm headquartered in greater Columbus, Ohio.” Source: RevenueBase Database · checked Sep 22, 2026
20	Converse Consultants	Indirect evidence	Monrovia, CA, United StatesHQ checked Sep 22, 2026	51-200	132 contacts →
	Indirect evidence “Converse was established in 1946 by Professor Frederick J.” Source: RevenueBase Database · checked Sep 22, 2026
21	Triad Engineering, INC	Indirect evidence	Scott Depot, WV, United StatesHQ checked Sep 22, 2026	51-200	128 contacts →
	Indirect evidence “As a multi-disciplinary consulting firm, Triad Engineering, Inc.(Triad) provides geotechnical and civil engineering, landscape architecture, environmental services, land…” Source: RevenueBase Database · checked Sep 22, 2026
22	S. W. Cole Engineering, INC	Indirect evidence	Bangor, ME, United StatesHQ checked Sep 22, 2026	51-200	125 contacts →
	Indirect evidence “S.” Source: RevenueBase Database · checked Sep 22, 2026
23	Pro-Vac, LLC	Partial evidence	Puyallup, WA, United StatesHQ checked Sep 22, 2026	51-200	123 contacts →
	Partial evidence “We deliver safe, efficient, and innovative subsurface solutions to support the maintenance and construction of our communities’ critical infrastructure through our expansive fleet…” Source: RevenueBase Database · checked Sep 22, 2026
24	Geopoint	Partial evidence	Tampa, FL, United StatesHQ checked Sep 22, 2026	201-500	121 contacts →
	Partial evidence “One of the largest privately owned land surveying companies in Florida, GeoPoint provides standard-setting services including subsurface utility location, 811 locating…” Source: RevenueBase Database · checked Sep 22, 2026
25	Tierra, Inc. A Certerra Company	Indirect evidence	Temple Terrace, FL, United StatesHQ checked Sep 22, 2026	51-200	118 contacts →
	Indirect evidence “Established in 1992, Tierra, Inc.(Tierra) is a full-service consulting geotechnical, forensics, environmental, and construction materials testing engineering firm.” Source: RevenueBase Database · checked Sep 22, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: subsurface exploration services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names subsurface exploration services.
Partial evidence: Its own public description names part of subsurface exploration services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsurface exploration services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,039 subsurface exploration services based in the United States

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Subsurface exploration services based in the United States at a glance

As of Sep 22, 2026

39.2%Verified-email coverage

16.9Average contacts per company

11-50Median size (employees)

7.4%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

446

11-50

399

51-200

159

201-500

501-1,000

1,001-5,000

5,001-10,000

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 1,039 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among subsurface exploration services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “subsurface exploration services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names subsurface exploration services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among subsurface exploration services, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 6,897 across the full list. 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 22, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Subsurface exploration services by metro

Subsurface exploration services in Houston77

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names subsurface exploration services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many subsurface exploration services are there based in the United States?

RevenueBase identified 1,039 subsurface exploration services headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Saexploration, headquartered in Houston, tops this list with the largest team on record.

Which city has the most subsurface exploration services?

Houston leads with 77 headquartered companies, followed by Denver (20) and Dallas (14).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 6,897 verified decision-maker contacts tracked across these 1,039 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 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 Smart Search, 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.