Company lists · Data refreshed September 2026

Top 25 Inspection service providers based in the United States

Name: Inspection service providers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 2,070 companies tracked

RevenueBase identified 2,070 inspection service providers headquartered in the United States as of September 2026 and tracks 47,268 professional contacts across them, including 17,968 with verified work emails. Houston is the largest hub.

This list covers inspection service providers 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 20, 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 20, 2026 86% judged on-target in blind review

2,070Companies

47,268Contacts tracked

17,968Verified emails

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The 25 largest inspection service providers based in the United States

Ranked by team size

Top 25 of 2,070 inspection service providers based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to inspection service providers: 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	UL Solutions	Indirect evidence	Northbrook, IL, United StatesHQ checked Sep 20, 2026	10001+	12,316 contacts →
	Indirect evidence “A global leader in applied safety science, UL Solutions (NYSE: ULS) transforms safety, security and sustainability challenges into opportunities for customers in more than 110…” Source: RevenueBase Database · checked Sep 20, 2026
2	Amspec Group	Strong evidence	Cranbury, NJ, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,447 contacts →
	Strong evidence “The AmSpec Group has been relied upon in the testing, inspection, and certification (TIC) sector for several decades.” Source: RevenueBase Database · checked Sep 20, 2026
3	Nv5	Indirect evidence	Hollywood, FL, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,230 contacts →
	Indirect evidence “NV5 is a provider of technology, conformity assessment, and consulting solutions for public and private sector clients supporting infrastructure, utility, and building assets and…” Source: RevenueBase Database · checked Sep 20, 2026
4	J. J. Keller & Associates, INC	Indirect evidence	Neenah, WI, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,577 contacts →
	Indirect evidence “J.” Source: RevenueBase Database · checked Sep 20, 2026
5	Stratosphere Quality	Strong evidence	Fishers, IN, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,553 contacts →
	Strong evidence “Stratosphere Quality, founded in 2009, is a major global provider of quality assurance and outsourcing solutions, such as sorting and inspection services, to manufacturers of…” Source: RevenueBase Database · checked Sep 20, 2026
6	ATLAS	Strong evidence	Denver, CO, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,529 contacts →
	Strong evidence “Atlas Technical Consultants (Atlas) provides professional testing, inspection, engineering, environmental and consulting services nationwide.” Source: RevenueBase Database · checked Sep 20, 2026
7	Applied Technical Services, LLC	Strong evidence	Marietta, GA, United StatesHQ checked Sep 20, 2026	1,001-5,000	890 contacts →
	Strong evidence “Applied Technical Services assists commercial and industrial clients by providing inspection, testing, consulting engineering, and calibration services.” Source: RevenueBase Database · checked Sep 20, 2026
8	Professional Service Industries, Inc. PSI	Indirect evidence	Arlington Heights, IL, United StatesHQ checked Sep 20, 2026	1,001-5,000	778 contacts →
	Indirect evidence “Intertek, a leading provider of quality solutions to industries around the world, has completed the acquisition of Professional Service Industries, Inc.(PSI), a leading…” Source: RevenueBase Database · checked Sep 20, 2026
9	TÜV Rheinland North America	Strong evidence	Boxborough, MA, United StatesHQ checked Sep 20, 2026	501-1,000	712 contacts →
	Strong evidence “TÜV Rheinland is a world leader in testing, inspection and certification services for a wide variety of industries.” Source: RevenueBase Database · checked Sep 20, 2026
10	IEH Laboratories And Consulting Group	Indirect evidence	Lake Forest Park, WA, United StatesHQ checked Sep 20, 2026	1,001-5,000	651 contacts →
	Indirect evidence “IEH is an international lab & consulting services company, offering a comprehensive portfolio of lab testing services and consultation across multiple industries.” Source: RevenueBase Database · checked Sep 20, 2026
11	Quality Integrated Services, Inc. QIS	Strong evidence	Guymon, OK, United StatesHQ checked Sep 20, 2026	1,001-5,000	524 contacts →
	Strong evidence “We’ve been a leader in the inspection and construction industry for over 25 years.” Source: RevenueBase Database · checked Sep 20, 2026
12	Socotec US	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	492 contacts →
	Indirect evidence “Welcome to SOCOTEC in the US, Trusted Expertise, From the Ground Up.” Source: RevenueBase Database · checked Sep 20, 2026
13	Sentinel Integrity Solutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	201-500	392 contacts →
	Indirect evidence “Sentinel ™ Integrity Solutions, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
14	FST Technical Services	Strong evidence	Chandler, AZ, United StatesHQ checked Sep 20, 2026	201-500	381 contacts →
	Strong evidence “Life Cycle Testing, Inspection, Certification & Engineering Solutions for Mission Critical Facilities Worldwide Commitment to Diversity – FST is dedicated to non-discriminatory…” Source: RevenueBase Database · checked Sep 20, 2026
15	Telgian	Indirect evidence	Phoenix, AZ, United StatesHQ checked Sep 20, 2026	201-500	354 contacts →
	Indirect evidence “Since 1985, Telgian has served as a trusted partner to clients around the globe, providing innovative fire, security, life safety consulting and engineering/design services…” Source: RevenueBase Database · checked Sep 20, 2026
16	Frontier Integrity Solutions	Strong evidence	Tulsa, OK, United StatesHQ checked Sep 20, 2026	201-500	343 contacts →
	Strong evidence “The FIS Management Team understands the changing landscape brought on by todays demands on inspection providers and strives to differentiate ourselves through strategic service…” Source: RevenueBase Database · checked Sep 20, 2026
17	Protect LLC	Indirect evidence	Wichita, KS, United StatesHQ checked Sep 20, 2026	501-1,000	332 contacts →
	Indirect evidence “PROtect is a leading national provider of reliability, risk, and compliance services to the refining, petrochemical, renewable fuels, manufacturing, food & beverage, fertilizer…” Source: RevenueBase Database · checked Sep 20, 2026
18	Quiktrak, LLC	Strong evidence	Beaverton, OR, United StatesHQ checked Sep 20, 2026	201-500	281 contacts →
	Strong evidence “Quiktrak is a leading provider of inspection and verification services to the global finance industry.” Source: RevenueBase Database · checked Sep 20, 2026
19	TJ Inspection, INC	Strong evidence	Oklahoma City, OK, United StatesHQ checked Sep 20, 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 20, 2026
20	Sonic Systems	Indirect evidence	Wilmington, NC, United StatesHQ checked Sep 20, 2026	501-1,000	245 contacts →
	Indirect evidence “Founded in 1977 Sonic Systems International (SSI) is a full-service quality-consulting firm serving the nuclear power generation utility industry.” Source: RevenueBase Database · checked Sep 20, 2026
21	Techcorr Usa, LLC	Strong evidence	Pasadena, TX, United StatesHQ checked Sep 20, 2026	501-1,000	226 contacts →
	Strong evidence “The TechCorr name is synonymous with safe, quality inspection services.” Source: RevenueBase Database · checked Sep 20, 2026
22	MGA Research Corporation	Indirect evidence	Akron, NY, United StatesHQ checked Sep 20, 2026	201-500	224 contacts →
	Indirect evidence “MGA is recognized worldwide as one of the leading independent providers of testing services and equipment.” Source: RevenueBase Database · checked Sep 20, 2026
23	Pro-Surve Technical Services	Strong evidence	League City, TX, United StatesHQ checked Sep 20, 2026	201-500	213 contacts →
	Strong evidence “Pro-Surve Technical Services is an advanced non-destructive testing and inspection company.” Source: RevenueBase Database · checked Sep 20, 2026
24	PRO QC International	Indirect evidence	Mchenry, IL, United StatesHQ checked Sep 20, 2026	501-1,000	211 contacts →
	Indirect evidence “Pro QC International provides tailored quality solutions with a human touch in 100 countries.” Source: RevenueBase Database · checked Sep 20, 2026
25	Industrial Inspection & Analysis	Strong evidence	Alpharetta, GA, United StatesHQ checked Sep 20, 2026	501-1,000	210 contacts →
	Strong evidence “Industrial Inspection & Analysis® (IIA) is an emerging, high growth inspection, testing, and analytical business seeking to build a national platform in order to serve a breadth…” Source: RevenueBase Database · checked Sep 20, 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: inspection service providers. 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 inspection service providers.
Partial evidence: Its own public description names part of inspection service providers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name inspection service providers. 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 2,070 inspection service providers based in the United States

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Inspection service providers based in the United States at a glance

As of Sep 20, 2026

38.0%Verified-email coverage

22.8Average contacts per company

1-10Median size (employees)

3.6%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,374

11-50

462

51-200

139

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 2,070 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 inspection service providers, 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 “inspection service providers”. 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 inspection service providers), 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 inspection service providers, 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, 17,968 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 20, 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.

Inspection service providers by metro

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 inspection service providers, 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 inspection service providers are there based in the United States?

RevenueBase identified 2,070 inspection service providers 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?

UL Solutions, headquartered in Northbrook, tops this list with the largest team on record.

Which city has the most inspection service providers?

Houston leads with 74 headquartered companies, followed by Miami (34) and New York (34).

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 17,968 verified decision-maker contacts tracked across these 2,070 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 20, 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.