Company lists · Data refreshed September 2026

Top 25 Industrial hygiene recruiting companies based in the United States

Name: Industrial hygiene recruiting 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 28, 2026 2,113 companies tracked

RevenueBase identified 2,113 industrial hygiene recruiting companies headquartered in the United States as of September 2026 and tracks 30,060 professional contacts across them, including 10,769 with verified work emails. Houston is the largest hub.

This list covers industrial hygiene recruiting 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 28, 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 28, 2026 86% judged on-target in blind review

2,113Companies

30,060Contacts tracked

10,769Verified emails

Explore this list → Free signup · no credit card · 500 free credits

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

Ranked by team size

Top 25 of 2,113 industrial hygiene recruiting companies based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to industrial hygiene recruiting 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	Barr Engineering CO	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,088 contacts →
	Indirect evidence “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: RevenueBase Database · checked Sep 28, 2026
2	Antea Group USA	Indirect evidence	St Paul, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	658 contacts →
	Indirect evidence “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: RevenueBase Database · checked Sep 28, 2026
3	STS Technical Services	Partial evidence	Brookfield, WI, United StatesHQ checked Sep 28, 2026	51-200	543 contacts →
	Partial evidence “STS Technical Services is a Top 100 Staffing Firm that’s partnered with some of the largest names in the aerospace, manufacturing, defense and industrial industries.” Source: RevenueBase Database · checked Sep 28, 2026
4	Ensafe	Indirect evidence	Memphis, TN, United StatesHQ checked Sep 28, 2026	201-500	463 contacts →
	Indirect evidence “Innovation is not happenstance at EnSafe Inc.” Source: RevenueBase Database · checked Sep 28, 2026
5	ROUX	Indirect evidence	Islandia, NY, United StatesHQ checked Sep 28, 2026	201-500	433 contacts →
	Indirect evidence “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Source: RevenueBase Database · checked Sep 28, 2026
6	RHM Staffing Solutions	Indirect evidence	Oak Brook, IL, United StatesHQ checked Sep 28, 2026	51-200	357 contacts →
	Indirect evidence “RHM Staffing Solutions is an award-winning staffing firm connecting top talent with employers through contract, contract-to-hire, and direct hire roles.” Source: RevenueBase Database · checked Sep 28, 2026
7	All4	Indirect evidence	Kimberton, PA, United StatesHQ checked Sep 28, 2026	201-500	331 contacts →
	Indirect evidence “ALL4 is a global consulting firm committed to shaping a sustainable future through innovative environmental, health, and safety (EHS) and digital solutions.” Source: RevenueBase Database · checked Sep 28, 2026
8	Apple & Associates	Partial evidence	Warrenville, SC, United StatesHQ checked Sep 28, 2026	n/a	305 contacts →
	Partial evidence “Apple & Associates is an executive search firm serving the following industries: Medical Device, Life Science, Pharmaceutical, Software, Government and National Laboratories and…” Source: RevenueBase Database · checked Sep 28, 2026
9	P&c Recruiting HR	Strong evidence	North America, United StatesHQ checked Sep 28, 2026	n/a	282 contacts →
	Strong evidence “People solutions in mining, green energy and related industrial sectors - executive and technical engineering/professional recruiting and human resources services throughout the…” Source: RevenueBase Database · checked Sep 28, 2026
10	GSI Environmental INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	201-500	259 contacts →
	Indirect evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 28, 2026
11	Ancon Services	Partial evidence	Los Alamitos, CA, United StatesHQ checked Sep 28, 2026	501-1,000	248 contacts →
	Partial evidence “Founded in 1968, Ancon Services has expanded our services to cover virtually all of our clients industrial and environmental needs.” Source: RevenueBase Database · checked Sep 28, 2026
12	August Mack Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	51-200	210 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
13	Hillmann Consulting, LLC	Partial evidence	Union, NJ, United StatesHQ checked Sep 28, 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 28, 2026
14	BAY West LLC	Partial evidence	St. Paul, MN, United StatesHQ checked Sep 28, 2026	201-500	187 contacts →
	Partial evidence “Bay West is an environmental and industrial services provider for site investigations, groundwater and soil remediation, munitions cleanup, hazardous waste management, industrial…” Source: RevenueBase Database · checked Sep 28, 2026
15	XL PRO Staffing And Consulting Group	Partial evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	182 contacts →
	Partial evidence “XL Pro Consulting Group is a leading full-service Light Industrial Staffing and Safety Consulting firm headquartered in Dallas, Texas, with operations in DFW, Houston, Austin, San…” Source: RevenueBase Database · checked Sep 28, 2026
16	Enviroscience, INC	Indirect evidence	Stow, OH, United StatesHQ checked Sep 28, 2026	51-200	176 contacts →
	Indirect evidence “EnviroScience is a team of over 150 expert biologists, commercial divers, environmental engineers, and environmental scientists that provides biomonitoring, environmental…” Source: RevenueBase Database · checked Sep 28, 2026
17	Forensic Analytical Consulting Services, INC	Indirect evidence	Hayward, CA, United StatesHQ checked Sep 28, 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 28, 2026
18	Environmental Health & Engineering	Indirect evidence	Newton, MA, United StatesHQ checked Sep 28, 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 28, 2026
19	Gradient	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	51-200	159 contacts →
	Indirect evidence “Gradient is an environmental and risk science consulting firm renowned for our specialties in Toxicology, Epidemiology, Risk Assessment, Product Safety, Contaminant Fate and…” Source: RevenueBase Database · checked Sep 28, 2026
20	Trade Management	Partial evidence	South Bend, IN, United StatesHQ checked Sep 28, 2026	n/a	159 contacts →
	Partial evidence “Trade Management is a recruiting firm, first and foremost, in the construction industry.” Source: RevenueBase Database · checked Sep 28, 2026
21	Movement Search & Delivery	Partial evidence	Clarkston, MI, United StatesHQ checked Sep 28, 2026	51-200	156 contacts →
	Partial evidence “MOVEMENT is a recruiting and search firm with global reach.” Source: RevenueBase Database · checked Sep 28, 2026
22	Keramida INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	51-200	152 contacts →
	Indirect evidence “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Source: RevenueBase Database · checked Sep 28, 2026
23	ZSG	Indirect evidence	Columbus, OH, United StatesHQ checked Sep 28, 2026	11-50	150 contacts →
	Indirect evidence “There's an art and a science to matching the right professional with the right career opportunity.” Source: RevenueBase Database · checked Sep 28, 2026
24	Sedona Staffing Services	Partial evidence	Dubuque, IA, United StatesHQ checked Sep 28, 2026	11-50	147 contacts →
	Partial evidence “Sedona Staffing Services (Careerpros LLC) is a Certified Woman Owned, professional nationwide recruiting and executive search firm.” Source: RevenueBase Database · checked Sep 28, 2026
25	Mostardi Platt	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 28, 2026	51-200	140 contacts →
	Indirect evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 28, 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 recruiting 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 recruiting companies.
Partial evidence: Its own public description names part of industrial hygiene recruiting 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 recruiting 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 2,113 industrial hygiene recruiting companies based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 10,769 reachable decision-makers.

Free signup · no credit card

View the full list →

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

As of Sep 28, 2026

35.8%Verified-email coverage

14.2Average contacts per company

1-10Median size (employees)

3.4%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,223

11-50

648

51-200

184

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 2,113 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 recruiting 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 recruiting 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 recruiting 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 recruiting 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, 10,769 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 28, 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.

Industrial hygiene recruiting companies 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 industrial hygiene recruiting 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 recruiting companies are there based in the United States?

RevenueBase identified 2,113 industrial hygiene recruiting 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?

Barr Engineering CO, headquartered in Minneapolis, tops this list with the largest team on record.

Which city has the most industrial hygiene recruiting companies?

Houston leads with 71 headquartered companies, followed by Chicago (25) and San Diego (24).

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 10,769 verified decision-maker contacts tracked across these 2,113 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 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 2,113 industrial hygiene recruiting companies based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Industrial hygiene recruiting companies by geography

Browse the directory

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.