Company lists · Data refreshed September 2026

Top 25 Oil and gas inspection services based in the United States

Name: Oil and gas inspection 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 17, 2026 1,235 companies tracked

RevenueBase identified 1,235 oil and gas inspection services headquartered in the United States as of September 2026 and tracks 36,418 professional contacts across them, including 10,880 with verified work emails. Houston is the largest hub.

This list covers oil and gas inspection 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 17, 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 17, 2026 86% judged on-target in blind review

1,235Companies

36,418Contacts tracked

10,880Verified emails

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The 25 largest oil and gas inspection services based in the United States

Ranked by team size

Top 25 of 1,235 oil and gas inspection services based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to oil and gas inspection 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	Amspec Group	Partial evidence	Cranbury, NJ, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,447 contacts →
	Partial evidence “The AmSpec Group has been relied upon in the testing, inspection, and certification (TIC) sector for several decades.” Source: RevenueBase Database · checked Sep 17, 2026
2	Mistras Group	Strong evidence	Princeton Junction, NJ, United StatesHQ checked Sep 17, 2026	5,001-10,000	2,887 contacts →
	Strong evidence “MISTRAS Group, Inc.(NYSE: MG) is a global leader in technology-enabled industrial asset integrity solutions, serving critical industries including oil & gas, aerospace & defense…” Source: RevenueBase Database · checked Sep 17, 2026
3	PMI	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 17, 2026	n/a	1,308 contacts →
	Indirect evidence “Training and Development Solutions” Source: RevenueBase Database · checked Sep 17, 2026
4	Cudd Energy Services	Strong evidence	The Woodlands, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,285 contacts →
	Strong evidence “Cudd offers a broad range of technical and specialized oilfield services to companies engaged in the exploration and production of oil and natural gas worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
5	Tuboscope	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	1,008 contacts →
	Indirect evidence “For more than 85 years, Tuboscope™ has provided the industry with tubular expertise and an integrated suite of value-added solutions.” Source: RevenueBase Database · checked Sep 17, 2026
6	Applied Technical Services, LLC	Partial evidence	Marietta, GA, United StatesHQ checked Sep 17, 2026	1,001-5,000	890 contacts →
	Partial evidence “Applied Technical Services assists commercial and industrial clients by providing inspection, testing, consulting engineering, and calibration services.” Source: RevenueBase Database · checked Sep 17, 2026
7	Camin Cargo Control INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	877 contacts →
	Partial evidence “At CAMIN, we provide inspection, laboratory testing, and additive treatment solutions to the Petroleum Industry.” Source: RevenueBase Database · checked Sep 17, 2026
8	Tulsa Inspection Resources, LLC	Partial evidence	Tulsa, OK, United StatesHQ checked Sep 17, 2026	1,001-5,000	770 contacts →
	Partial evidence “Core capabilities include: Inspection Services (Chief, CWI, NACE/AMPP, Utility, Environmental, Safety, Poly, etc), Non-Destructive Examination (Ultrasonic Testing (UT), Phased…” Source: RevenueBase Database · checked Sep 17, 2026
9	Island Operating Company	Strong evidence	Scott, LA, United StatesHQ checked Sep 17, 2026	1,001-5,000	570 contacts →
	Strong evidence “Improving efficiency and reducing costs, all while meeting safety requirements, is the challenge faced by every operator in the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
10	Quality Integrated Services, Inc. QIS	Partial evidence	Guymon, OK, United StatesHQ checked Sep 17, 2026	1,001-5,000	524 contacts →
	Partial evidence “We’ve been a leader in the inspection and construction industry for over 25 years.” Source: RevenueBase Database · checked Sep 17, 2026
11	Sentinel Integrity Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	392 contacts →
	Indirect evidence “Sentinel ™ Integrity Solutions, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
12	Express Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	379 contacts →
	Indirect evidence “Express Energy Services, a leading oilfield services company, is active in every major hydrocarbon basin in the United States and is a premier provider of products and services…” Source: RevenueBase Database · checked Sep 17, 2026
13	Versa Integrity Group, INC	Indirect evidence	Tomball, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	356 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
14	Knight OIL Tools	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	325 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
15	Kestrel Engineering, INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	318 contacts →
	Strong evidence “Kestrel provides engineering, project and construction management and inspection services to the oil and gas industries.” Source: RevenueBase Database · checked Sep 17, 2026
16	Greene's Energy Group	Strong evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	285 contacts →
	Strong evidence “Greene’s Energy Group offers a range of support services and products to the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
17	Structural Integrity Associates	Indirect evidence	Huntersville, NC, United StatesHQ checked Sep 17, 2026	201-500	274 contacts →
	Indirect evidence “Structural Integrity Associates is the most-trusted provider of proven engineering services for the energy and process industries.” Source: RevenueBase Database · checked Sep 17, 2026
18	Crosby Energy Services	Indirect evidence	Cut Off, LA, United StatesHQ checked Sep 17, 2026	201-500	272 contacts →
	Indirect evidence “Founded as C&D Wireline in 1968, with C&D Production Specialist joining the business in 1993, today Crosby Energy Services is a certified Women’s Business Enterprise National…” Source: RevenueBase Database · checked Sep 17, 2026
19	TJ Inspection, INC	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 17, 2026	201-500	262 contacts →
	Strong evidence “Setting the Standard for Premier Inspection Services in the Oil & Gas Industry through our Dedication to Tradition / Talent / Technology / Teamwork TJ Inspection provides the…” Source: RevenueBase Database · checked Sep 17, 2026
20	M&h	Strong evidence	Spring, TX, United StatesHQ checked Sep 17, 2026	201-500	253 contacts →
	Strong evidence “For more than 40 years, M&H has been a trusted source for oil & gas consulting services that maximize value for clients.” Source: RevenueBase Database · checked Sep 17, 2026
21	Udelhoven	Partial evidence	Anchorage, AK, United StatesHQ checked Sep 17, 2026	201-500	233 contacts →
	Partial evidence “Udelhoven Company founded in 1970 is a privately held full service construction, operations and maintenance company offering diversified products and services from oil field…” Source: RevenueBase Database · checked Sep 17, 2026
22	Techcorr Usa, LLC	Partial evidence	Pasadena, TX, United StatesHQ checked Sep 17, 2026	501-1,000	226 contacts →
	Partial evidence “The TechCorr name is synonymous with safe, quality inspection services.” Source: RevenueBase Database · checked Sep 17, 2026
23	Pro-Surve Technical Services	Partial evidence	League City, TX, United StatesHQ checked Sep 17, 2026	201-500	213 contacts →
	Partial evidence “Pro-Surve Technical Services is an advanced non-destructive testing and inspection company.” Source: RevenueBase Database · checked Sep 17, 2026
24	Casedhole-Solutions, Inc.- A C&j Energy Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	191 contacts →
	Indirect evidence “Getting it done right.” Source: RevenueBase Database · checked Sep 17, 2026
25	Entegra	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 17, 2026	51-200	175 contacts →
	Partial evidence “ENTEGRA® is the pioneer and sole provider of true Ultra-High Resolution (UHR) Magnetic Flux Leakage (MFL) inline inspection systems for pipeline integrity assessment.” Source: RevenueBase Database · checked Sep 17, 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: oil and gas inspection 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 oil and gas inspection services.
Partial evidence: Its own public description names part of oil and gas inspection services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oil and gas inspection 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 1,235 oil and gas inspection services based in the United States

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Oil and gas inspection services based in the United States at a glance

As of Sep 17, 2026

29.9%Verified-email coverage

29.5Average contacts per company

11-50Median size (employees)

14.9%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

446

11-50

444

51-200

221

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,235 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 oil and gas inspection 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 “oil and gas inspection 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 oil and gas inspection 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 oil and gas inspection 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, 10,880 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 17, 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.

Oil and gas inspection services by metro

Oil and gas inspection services in Houston184
Oil and gas inspection services in Midland38

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 oil and gas inspection 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 oil and gas inspection services are there based in the United States?

RevenueBase identified 1,235 oil and gas inspection 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?

Amspec Group, headquartered in Cranbury, tops this list with the largest team on record.

Which city has the most oil and gas inspection services?

Houston leads with 184 headquartered companies, followed by Midland (38) and Odessa (21).

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 10,880 verified decision-maker contacts tracked across these 1,235 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 17, 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.