Company lists · Data refreshed September 2026

Top 25 Borehole drilling services based in the United States

Name: Borehole drilling 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 19, 2026 475 companies tracked

RevenueBase identified 475 borehole drilling services headquartered in the United States as of September 2026 and tracks 7,071 professional contacts across them, including 1,379 with verified work emails. Midland is the largest hub.

This list covers borehole drilling 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 19, 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 19, 2026 86% judged on-target in blind review

475Companies

7,071Contacts tracked

1,379Verified emails

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The 25 largest borehole drilling services based in the United States

Ranked by team size

Top 25 of 475 borehole drilling services based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to borehole drilling 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	Boart Longyear	Partial evidence	West Valley City, UT, United StatesHQ checked Sep 19, 2026	5,001-10,000	3,285 contacts →
	Partial evidence “Established in 1890, Boart Longyear is the world’s leading innovative provider of drilling services, manufacturer of productivity-driven drilling equipment and performance…” Source: RevenueBase Database · checked Sep 19, 2026
2	Cascade Environmental, LLC	Partial evidence	Bothell, WA, United StatesHQ checked Sep 19, 2026	1,001-5,000	248 contacts →
	Partial evidence “CASCADE is the leading provider of environmental and geotechnical drilling, site investigation and environmental remediation.” Source: RevenueBase Database · checked Sep 19, 2026
3	Nomac Drilling	Partial evidence	El Reno, OK, United StatesHQ checked Sep 19, 2026	1,001-5,000	134 contacts →
	Partial evidence “Nomac Drilling is now Patterson-UTI.” Source: RevenueBase Database · checked Sep 19, 2026
4	Geoprobe Systems	Partial evidence	Salina, KS, United StatesHQ checked Sep 19, 2026	51-200	107 contacts →
	Partial evidence “Geoprobe® Manufactures Powerful, Compact Machines & Tooling that Provide Direct Push, Rotary, & Sonic Drilling Capabilities to the Environmental, Geotechnical, Geothermal, &…” Source: RevenueBase Database · checked Sep 19, 2026
5	Shaft Drillers International	Indirect evidence	Mt Morris, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	78 contacts →
	Indirect evidence “Shaft Drillers International LLC Headquartered in Mt.” Source: RevenueBase Database · checked Sep 19, 2026
6	Timberline Drilling, INC	Partial evidence	Elko, NV, United StatesHQ checked Sep 19, 2026	201-500	77 contacts →
	Partial evidence “With more than 7.4 million feet drilled in the past seven years, Timberline Drilling has a proven track records in safety and production.” Source: RevenueBase Database · checked Sep 19, 2026
7	Mobile Drill Intl	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	11-50	42 contacts →
	Indirect evidence “Mobile Drill Intl manufactures a full line of drill rigs and tooling servicing the Geotechnical, Environmental, Mineral Exploration, Water Well and Seismic industries.” Source: RevenueBase Database · checked Sep 19, 2026
8	Gregg Drilling, LLC	Partial evidence	Signal Hill, CA, United StatesHQ checked Sep 19, 2026	51-200	39 contacts →
	Partial evidence “Gregg Drilling, LLC.(Gregg) offers a wide range of services for environmental, geotechnical and marine site investigation and remediation.” Source: RevenueBase Database · checked Sep 19, 2026
9	Century Wireline Services	Partial evidence	Tulsa, OK, United StatesHQ checked Sep 19, 2026	51-200	33 contacts →
	Partial evidence “Century Wireline Services, an entity of Century Geophysical LLC, offers borehole geophysical logging services.” Source: RevenueBase Database · checked Sep 19, 2026
10	Keystone Drill Services	Partial evidence	Somerset, PA, United StatesHQ checked Sep 19, 2026	11-50	31 contacts →
	Partial evidence “Keystone Drill Services pairs over a century of drilling experience with a diverse supplier network to resolve drill-related issues with unprecedented efficiency.” Source: RevenueBase Database · checked Sep 19, 2026
11	Parratt-Wolff, INC	Partial evidence	East Syracuse, NY, United StatesHQ checked Sep 19, 2026	51-200	28 contacts →
	Partial evidence “Environmental and Geotechnical Drilling Services Parratt-Wolff strives to ensure that every environmental or geotechnical site investigation meets or exceeds our client's…” Source: RevenueBase Database · checked Sep 19, 2026
12	Diedrich Drill	Partial evidence	La Porte, IN, United StatesHQ checked Sep 19, 2026	11-50	27 contacts →
	Partial evidence “Diedrich Drill is a full service manufacturer of top quality drilling equipment for the geotechnical, environmental, geothermal, and groundwater industries.” Source: RevenueBase Database · checked Sep 19, 2026
13	A.C. Schultes, INC	Indirect evidence	Woodbury Heights, NJ, United StatesHQ checked Sep 19, 2026	51-200	25 contacts →
	Indirect evidence “A.C.” Source: RevenueBase Database · checked Sep 19, 2026
14	N&n Drilling Supply	Partial evidence	Jessup, PA, United StatesHQ checked Sep 19, 2026	11-50	25 contacts →
	Partial evidence “Since 1967 N&N Drilling Supply has accommodated the needs of a growing worldwide market for drilling supplies and equipment.” Source: RevenueBase Database · checked Sep 19, 2026
15	Betts Drilling	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	51-200	24 contacts →
	Partial evidence “Betts is a drilling services contractor that has been an industry leading provider of drilling solutions since 1993.” Source: RevenueBase Database · checked Sep 19, 2026
16	Griner Drilling Service, INC	Indirect evidence	Columbia, MS, United StatesHQ checked Sep 19, 2026	51-200	24 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
17	ABC Liovin Drilling, INC	Partial evidence	Signal Hill, CA, United StatesHQ checked Sep 19, 2026	51-200	23 contacts →
	Partial evidence “Environmental and geotechnical drilling company with two offices based out of Signal Hill (Los Angeles), CA, Bloomington (San Bernardino), CA and Las Vegas, NV.” Source: RevenueBase Database · checked Sep 19, 2026
18	Century Geophysical, LLC	Partial evidence	Tulsa, OK, United StatesHQ checked Sep 19, 2026	51-200	23 contacts →
	Partial evidence “Century is a leading provider of borehole geophysical instruments.” Source: RevenueBase Database · checked Sep 19, 2026
19	Petromar, A Nabors Company	Partial evidence	Exton, PA, United StatesHQ checked Sep 19, 2026	11-50	22 contacts →
	Partial evidence “PetroMar, a Nabors Company, offers the new, award-winning OBM-compatible FracView LWD Borehole Imager/Caliper as well as a pipeline of other oilfield products and services –…” Source: RevenueBase Database · checked Sep 19, 2026
20	Catlin Engineers And Scientists	Partial evidence	Wilmington, NC, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Partial evidence “CATLIN provides Environmental and Geotechnical Engineering as well as drilling services throughout the Southeast.” Source: RevenueBase Database · checked Sep 19, 2026
21	White Mountain Operating	Indirect evidence	Pinedale, WY, United StatesHQ checked Sep 19, 2026	51-200	21 contacts →
	Indirect evidence “When your company needs oil and gas exploration, geothermal, disposal, water wells, caisson, pier or conductor/rat/mouse holes, using top of the line, well maintained equipment…” Source: RevenueBase Database · checked Sep 19, 2026
22	Connelly And Associates, INC	Indirect evidence	Frederick, MD, United StatesHQ checked Sep 19, 2026	51-200	20 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
23	Bc2 Environmental	Partial evidence	Orange, CA, United StatesHQ checked Sep 19, 2026	51-200	18 contacts →
	Partial evidence “BC2 Environmental is a California-based company specializing in environmental and geotechnical drilling.” Source: RevenueBase Database · checked Sep 19, 2026
24	Sam's Well Drilling	Partial evidence	Randolph, WI, United StatesHQ checked Sep 19, 2026	51-200	17 contacts →
	Partial evidence “Sam's Well Drilling is the Midwest's premier drilling company.” Source: RevenueBase Database · checked Sep 19, 2026
25	Acker Drill Company	Partial evidence	Scranton, PA, United StatesHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “The First Name in Drilling.” Source: RevenueBase Database · checked Sep 19, 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: borehole drilling 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 borehole drilling services.
Partial evidence: Its own public description names part of borehole drilling services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name borehole drilling 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 475 borehole drilling services based in the United States

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Borehole drilling services based in the United States at a glance

As of Sep 19, 2026

19.5%Verified-email coverage

14.9Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · Midland

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

238

11-50

182

51-200

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 475 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 borehole drilling 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 “borehole drilling 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 borehole drilling 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 borehole drilling 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, 1,379 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 19, 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.

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 borehole drilling 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 borehole drilling services are there based in the United States?

RevenueBase identified 475 borehole drilling 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?

Boart Longyear, headquartered in West Valley City, tops this list with the largest team on record.

Which city has the most borehole drilling services?

Midland leads with 7 headquartered companies, followed by Houston (5) and Orlando (4).

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 1,379 verified decision-maker contacts tracked across these 475 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 19, 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.