Company lists · Data refreshed September 2026

Top 25 Industrial hygiene testing companies based in the United States

Name: Industrial hygiene testing companies 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 1,072 companies tracked

RevenueBase identified 1,072 industrial hygiene testing companies headquartered in the United States as of September 2026 and tracks 15,846 professional contacts across them, including 5,469 with verified work emails. Houston is the largest hub.

This list covers industrial hygiene testing companies 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

1,072Companies

15,846Contacts tracked

5,469Verified emails

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The 25 largest industrial hygiene testing companies based in the United States

Ranked by team size

Top 25 of 1,072 industrial hygiene testing companies 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 industrial hygiene testing companies: 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	Pace Analytical Services	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,228 contacts →
	Indirect evidence “Pace® Science and Technology Company makes the world a safer, healthier place.” Source: RevenueBase Database · checked Sep 17, 2026
2	Emsl Analytical, INC	Partial evidence	Cinnaminson, NJ, United StatesHQ checked Sep 17, 2026	501-1,000	719 contacts →
	Partial evidence “As the nation's leading environmental testing firm, EMSL's network of nationwide laboratories has been providing quality analytical services since 1981.” Source: RevenueBase Database · checked Sep 17, 2026
3	Enthalpy Analytical	Partial evidence	North Little Rock, AR, United StatesHQ checked Sep 17, 2026	501-1,000	349 contacts →
	Partial evidence “Our laboratory service experts provide clients with precision testing support, innovative scientific approaches, and high-quality data that delivers a sense of certainty.” Source: RevenueBase Database · checked Sep 17, 2026
4	Alpha Analytical	Indirect evidence	Westborough, MA, United StatesHQ checked Sep 17, 2026	501-1,000	254 contacts →
	Indirect evidence “Since 1987, Alpha Analytical, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
5	August Mack Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 17, 2026	51-200	210 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
6	Hillmann Consulting, LLC	Partial evidence	Union, NJ, United StatesHQ checked Sep 17, 2026	201-500	209 contacts →
	Partial evidence “Hillmann has been a well-recognized leader in the Environmental Health & Safety, Due Diligence & Remediation Management, and Construction Services industries since 1985.” Source: RevenueBase Database · checked Sep 17, 2026
7	RJ LEE Group	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 17, 2026	201-500	194 contacts →
	Partial evidence “RJ Lee Group provides comprehensive laboratory testing and scientific consulting services.” Source: RevenueBase Database · checked Sep 17, 2026
8	Forensic Analytical Consulting Services, INC	Indirect evidence	Hayward, CA, United StatesHQ checked Sep 17, 2026	51-200	172 contacts →
	Indirect evidence “With a staff of over 150 employees in the San Francisco, Sacramento, Los Angeles, San Diego, Modesto, Bakersfield, Fresno, Portland, Chicago, and Grand Rapids offices, Forensic…” Source: RevenueBase Database · checked Sep 17, 2026
9	Environmental Health & Engineering	Indirect evidence	Newton, MA, United StatesHQ checked Sep 17, 2026	51-200	170 contacts →
	Indirect evidence “EH & E delivers integrated environmental, engineering, and health and safety solutions that help businesses and institutions safeguard their assets, improve operations and boost…” Source: RevenueBase Database · checked Sep 17, 2026
10	Smithers	Strong evidence	Wareham, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	155 contacts →
	Strong evidence “Smithers is a leading provider of environmental risk testing to the Agrochemical, Pharmaceutical, and Chemical industries.” Source: RevenueBase Database · checked Sep 17, 2026
11	Cleanair Engineering	Partial evidence	Palatine, IL, United StatesHQ checked Sep 17, 2026	51-200	152 contacts →
	Partial evidence “Since its founding in 1972, CleanAir has an established reputation for excellence on projects of all sizes, ranging from boiler, APC equipment and cooling tower efficiency testing…” Source: RevenueBase Database · checked Sep 17, 2026
12	Energy Laboratories, INC	Indirect evidence	Billings, MT, United StatesHQ checked Sep 17, 2026	201-500	113 contacts →
	Indirect evidence “Founded in 1952, Energy Laboratories, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
13	Metiri Group	Partial evidence	Geneva, IL, United StatesHQ checked Sep 17, 2026	201-500	112 contacts →
	Partial evidence “Established in 2019, Metiri Group has focused on using full-service environmental laboratories to deliver testing services to inform the decisions that improve the lives of people…” Source: RevenueBase Database · checked Sep 17, 2026
14	American Industrial Hygiene Association Aiha	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 17, 2026	11-50	108 contacts →
	Indirect evidence “Founded in 1939, AIHA is a nonprofit organization serving professionals dedicated to the anticipation, recognition, evaluation, control, and confirmation of environmental…” Source: RevenueBase Database · checked Sep 17, 2026
15	A-Tech Consulting, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 17, 2026	51-200	97 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
16	SKC INC	Strong evidence	Eighty Four, PA, United StatesHQ checked Sep 17, 2026	51-200	95 contacts →
	Strong evidence “SKC is a well-known and respected leader in industrial hygiene and occupational safety.” Source: RevenueBase Database · checked Sep 17, 2026
17	Aerostar SES LLC	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 17, 2026	51-200	94 contacts →
	Indirect evidence “Aerostar SES LLC (ASL) is committed to delivering innovative solutions for our clients’ environmental, engineering, and remediation needs.” Source: RevenueBase Database · checked Sep 17, 2026
18	Yorke Engineering, LLC	Strong evidence	San Juan Capistrano, CA, United StatesHQ checked Sep 17, 2026	51-200	92 contacts →
	Strong evidence “Yorke Engineering, LLC (Yorke) was founded in 1996 and specializes in air quality, waste, storm water and industrial hygiene/safety services.” Source: RevenueBase Database · checked Sep 17, 2026
19	Envirocheck, INC	Indirect evidence	Orange, CA, United StatesHQ checked Sep 17, 2026	51-200	91 contacts →
	Indirect evidence “Founded in 1998, ENVIROCHECK, INC.” Source: RevenueBase Database · checked Sep 17, 2026
20	ALC Environmental	Partial evidence	New York, NY, United StatesHQ checked Sep 17, 2026	51-200	82 contacts →
	Partial evidence “ALC provides a wide range of environmental services from testing and reporting on potentially unsafe or hazardous conditions (asbestos, lead paint, indoor air quality/mold, soil…” Source: RevenueBase Database · checked Sep 17, 2026
21	Mabbett & Associates, INC	Indirect evidence	Stoneham, MA, United StatesHQ checked Sep 17, 2026	51-200	79 contacts →
	Indirect evidence “Established in 1980, Mabbett & Associates, Inc.(Mabbett) is a recognized leader in delivering comprehensive environmental, health, and safety consulting and engineering services.” Source: RevenueBase Database · checked Sep 17, 2026
22	ISI Environmental	Partial evidence	Wichita, KS, United StatesHQ checked Sep 17, 2026	51-200	79 contacts →
	Partial evidence “iSi provides environmental, health and safety facility support services to a wide variety of industries across the U.S.” Source: RevenueBase Database · checked Sep 17, 2026
23	Phoenix Environmental Laboratories, INC	Indirect evidence	Manchester, CT, United StatesHQ checked Sep 17, 2026	51-200	78 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
24	Occupational Services, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	11-50	74 contacts →
	Indirect evidence “Occupational Services, Incorporated is a San Diego-based professional consulting firm providing services in the areas of environmental compliance, occupational health and safety…” Source: RevenueBase Database · checked Sep 17, 2026
25	Wise Safety & Environmental	Indirect evidence	St. Louis, MO, United StatesHQ checked Sep 17, 2026	51-200	74 contacts →
	Indirect evidence “Wise Safety & Environmental consists of Wise El Santo Co.” 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: industrial hygiene testing companies. 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 industrial hygiene testing companies.
Partial evidence: Its own public description names part of industrial hygiene testing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name industrial hygiene testing companies. 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 1,072 industrial hygiene testing companies based in the United States

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Industrial hygiene testing companies based in the United States at a glance

As of Sep 17, 2026

34.5%Verified-email coverage

14.8Average contacts per company

1-10Median size (employees)

2.0%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

554

11-50

387

51-200

104

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 1,072 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 industrial hygiene testing companies, 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 “industrial hygiene testing companies”. 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 industrial hygiene testing companies), 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 industrial hygiene testing companies, 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, 5,469 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.

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 industrial hygiene testing companies, 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 industrial hygiene testing companies are there based in the United States?

RevenueBase identified 1,072 industrial hygiene testing companies 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?

Pace Analytical Services, headquartered in Minneapolis, tops this list with the largest team on record.

Which city has the most industrial hygiene testing companies?

Houston leads with 21 headquartered companies, followed by New York (20) and Las Vegas (13).

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 5,469 verified decision-maker contacts tracked across these 1,072 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.